Machinery''''s Handbook 27th Episode 3 Part 6 doc

MILLING MACHINE INDEXING 1995
0.1910 17/39 − 12/49 21/57 − 11/62 0.2222 4/18 …
0.1915 9/47 9/47 0.2222 6/27 12/54
0.1920 7/41 + 1/47 12/57 − 1/54 0.2230 15/31 − 6/23 11/46 − 1/62
0.1930 … 11/57 0.2240 5/41 + 5/49 15/38 − 7/41
0.1930 10/19 − 5/15 19/59 − 8/62 0.2241 … 13/58
0.1935 6/31 12/62 0.2245 11/49 11/49
0.1940 7/41 + 1/43 14/43 − 5/38 0.2250 2/16 + 2/20 3/24 + 3/30
0.1950 1/23 + 5/33 8/25 − 3/24 0.2258 7/31 14/62
0.1951 8/41 8/41 0.2260 7/39 + 2/43 2/49 + 10/54
0.1957 … 9/46 0.2264 … 12/53
0.1960 21/49 − 10/43 34/66 − 15/47 0.2270 7/27 − 1/31 14/54 − 2/62
0.1961 … 10/51 0.2273 … 15/66
0.1970 … 13/66 0.2280 11/39 − 2/37 23/49 − 14/58
0.1970 21/39 − 14/41 11/47 − 2/54 0.2281 … 13/57
0.1980 2/29 + 4/31 17/49 − 7/47 0.2290 18/39 − 10/43 29/51 − 18/53
0.1990 5/37 + 3/47 27/59 − 15/58 0.2300 7/37 + 2/49 12/25 − 6/24
0.2000 3/15 5/25 0.2308 9/39 9/39
0.2000 4/20 6/30 0.2310 28/49 − 16/47
26/59 − 13/62
0.2010 11/39 − 3/37 8/49 + 2/53 0.2320 20/41 − 11/43 26/57 − 13/58
0.2020 23/41 − 14/39 23/41 − 14/39 0.2326 10/43 10/43
0.2030 2/37 + 7/47 19/62 − 6/58 0.2330 27/47 − 14/41 25/62 − 8/47
0.2034 … 12/59 0.2333 … 7/30
0.2037 … 11/54 0.2340 24/41 − 13/37 2/54 + 13/66
0.2040 12/47 − 2/39 18/51 − 7/47 0.2340 11/47 11/47
0.2041 10/49 10/49 0.2350 11/27 − 5/29 9/25 − 3/24
0.2050 13/37 − 6/41 3/24 + 2/25 0.2353 4/17 8/34
0.2051 8/39 8/39 0.2353 … 12/51
0.2059 … 7/34 0.2360 10/39 − 1/49 29/66 − 12/59

0.2060 15/43 − 7/49 12/53 − 1/49 0.2368 … 9/38
0.2069 6/29 12/58 0.2370 23/37 − 15/39 23/37 − 15/39
0.2070 19/41 − 10/39 19/41 − 10/39 0.2373 … 14/59
0.2075 … 11/53 0.2380 2/43 + 9/47 34/57 − 19/53
0.2080 15/31 − 8/29 13/58 − 1/62 0.2381 5/21 10/42
0.2083 … 5/24 0.2390 24/43 − 15/47 12/62 + 3/
66
0.2090 16/33 − 8/29 8/46 + 2/57 0.2391 … 11/46
0.2093 9/43 9/43 0.2400 3/43 + 8/47 6/25
0.2097 … 13/62 0.2407 … 13/54
0.2100 22/37 − 15/39 6/24 − 1/25 0.2410 19/47 − 8/49 17/47 − 7/58
0.2105 4/19 8/38 0.2414 7/29 14/58
0.2105 … 12/57 0.2419 … 15/62
0.2110 22/41 − 14/43 22/41 − 14/43 0.2420 21/37 − 14/43 12/46 − 1/53
0.2120 2/27 − 4/29 4/54 + 8/58 0.2424 8/33 16/66
0.2121 7/33 14/66 0.2430 29/49 − 15/43 4/47 + 9/57
0.2128 10/47 10/47 0.2432 9/37 9/37
0.2130 23/49 − 10/39 2/30 + 6/41 0.2439 10/41 10/41
0.2140 20/37 − 16/49 12/51 − 1/47 0.2440 13/49 − 1/47 30/53 − 19/59
0.2143 … 6/28 0.2449 12/49 12/49
0.2143 … 9/42 0.2450 13/37 − 5/47 3/24 + 3/25
0.2150 11/43 − 2/49 9/24 − 4/25 0.2453 … 13/53
0.2157 … 11/51 0.2456 … 14/57
0.2160 2/23 + 4/31 25/51 − 17/62 0.2460 20/49 − 6/37 11/37 − 2/39
0.2162 8/37 8/37 0.2470 10/37 − 1/43 29/49 − 20/58
0
.2170 11/41 − 2/39 28/59 − 17/66 0.2480 4/23 + 2/27 26/49 − 13/46
0.2174 5/23 10/46 0.2490 10/37 − 1/47 17/43 − 6/41
0.2180 3/31 + 4/33 21/59 − 8/58 0.2500 4/16 6/24
0.2190 11/23 − 7/27 3/47 + 9/58 0.2500 5/20 7/28

0.2195 9/41 9/41 0.2510 2/15 + 2/17 34/66 − 14/53
0.2200 4/41 + 6/49 3/25 + 3/30 0.2520 24/43 − 15/49 22/49 − 13/66
0.2203 … 13/59 0.2530 7/37 + 3/47 11/53 + 3/66
0.2210 18/49 − 6/41 21/47 − 14/62 0.2540 26/49 − 13/47 2/46 + 12/57
0.2220 25/41 − 19/49 7/51 + 5/59 0.2542 … 15/59
Table 3. (Continued) Accurate Angular Indexing
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
1996 MILLING MACHINE INDEXING
0.2549 … 13/51 0.2857 … 12/42
0.2550 4/21 + 2/31 9/24 − 3/25 0.2857 … 8/28
0.2553 12/47 12/47 0.2860 20/47 − 6/43 20/58 − 3/51

0.2558 11/43 11/43 0.2870 7/41 + 5/43 20/42 − 7/37
0.2560 13/33 − 4/29 9/47 + 4/62 0.2879 … 19/66
0.2564 10/39 10/39 0.2880 19/43 − 6/39 19/43 − 6/39
0.2570 20/39 − 11/43 8/53 + 7/66 0.2881 … 17/59
0.2576 … 17/66 0.2890 1/21 + 7/29 16/46 − 3/51
0.2580 15/29 − 7/27 24/54 − 11/59 0.2895 … 11/38
0.2581 8/31 16/62 0.2900 23/43 − 12/49 6/24 + 1/25
0.2586 … 15/58 0.2903 9/31 18/62
0.2590 24/49 − 9/39 16/42 − 5/41 0.2910 5/39 + 7/43 7/49 + 8/54
0.2593 7/27 14/54 0.2917 … 7/24
0.2600 20/43 − 8/39 4/25 + 3/30 0.2920 9/39 + 3/49 35/57 − 19/59
0.2609 6/23 12/46 0.2927 12/41 12/41
0.2610 15/33 − 6/31 5/53 + 9/54 0.2930 17/39 − 7/49 28/53 − 12/51
0.2619 … 11/42 0.2931 … 17/58
0.2620 18/37 − 11/49 16/51 −
3/58 0.2940 8/21 − 2/23 14/57 + 3/62
0.2630 13/41 − 2/37 13/46 − 1/51 0.2941 5/17 10/34
0.2632 5/19 10/38 0.2941 … 15/51
0.2632 … 15/57 0.2950 18/37 − 9/47 9/24 − 2/25
0.2640 22/47 − 10/49 22/47 − 10/49 0.2960 21/41 − 8/37 29/57 − 10/47
0.2642 … 14/53 0.2963 8/27 16/54
0.2647 … 9/34 0.2970 3/29 + 6/31 13/47 + 1/49
0.2650 8/37 + 2/41 15/24 − 9/25 0.2973 11/37 11/37
0.2653 13/49 13/49 0.2979 14/47 14/47
0.2660 8/27 − 1/33 28/51 − 15/53 0.2980 11/21 − 7/31 12/37 − 1/38
0.2667 … 8/30 0.2982 … 17/57
0.2670 18/37 − 9/41 19/47 − 7/51 0.2990 19/43 − 7/49 19/43 − 4/28
0.2680 8/18 − 3/17 27/49 − 15/53 0.3000 6/20 9/30
0.2683 11/41 11/41 0.3010 1/41 + 13/47 19/54 − 3/59
0.2690 2/18 + 3/19 6/54 + 9/57 0.3019 … 16/53

0.2700 16/27 − 10/31 13/25 − 6/24 0.3020 7/29 + 2/33 23/62 − 4/58
0.2703 10/37 10/37 0.3023 13/43 13/43
0.2710 2/43 + 11/49 1/28 + 8/34 0.3030 15/39 − 4/49 25/57 −
8/59
0.2712 … 16/59 0.3030 10/33 20/66
0.2720 14/37 − 5/47 17/59 − 1/62 0.3040 16/31 − 7/33 33/59 − 12/47
0.2727 9/33 18/66 0.3043 7/23 14/46
0.2730 1/16 + 4/19 18/34 − 10/39 0.3050 1/31 + 9/33 15/24 − 8/25
0.2740 6/41 + 6/47 26/59 − 9/54 0.3051 … 18/59
0.2742 … 17/62 0.3060 17/31 − 8/33 33/54 − 18/59
0.2745 … 14/51 0.3061 15/49 15/49
0.2750 2/16 + 3/20 5/24 + 2/30 0.3065 … 19/62
0.2759 8/29 16/58 0.3070 18/37 − 7/39 1/53 + 17/59
0.2760 12/31 − 3/27 13/43 − 1/38 0.3077 12/39 12/39
0.2766 13/47 13/47 0.3080 5/41 + 8/43 16/49 − 1/54
0.2770 11/27 − 3/23 18/28 − 15/41 0.3090 1/43 + 14/49 19/30 − 12/37
0.2778 5/18 15/54 0.3095 … 13/42
0.2780 5/23 + 2/33 17/39 − 6/38 0.3100 16/37 − 6/49 14/25 − 6/24
0.2790 16/29 − 9/33 14/47 − 1/53 0.3103 9/29 18/58
0.2791 12/43 12/43 0.3110 3/39 + 11/47 19/46 − 5/49
0.2800 16/49 − 2/43 7/25 0.3120 8/21 − 2/29 2/49 + 16/59
0
.2807 … 16/57 0.3125 5/16 …
0.2810 3/39 + 10/49 17/57 − 1/58 0.3130 9/37 + 3/43 4/24 + 6/41
0.2820 5/27 + 3/31 24/66 − 4/49 0.3137 … 16/51
0.2821 11/39 11/39 0.3140 12/27 − 3/23 14/47 + 1/62
0.2826 … 13/46 0.3148 … 17/54
0.2830 14/43 − 2/47 15/53 0.3150 26/41 − 15/47 21/24 − 14/25
0.2840 21/47 − 7/43 37/66 − 13/47 0.3158 … 12/38
0.2850 15/43 − 3/47 3/24 + 4/25 0.3158 … 18/57

0.2857 14/49 14/49 0.3160 6/37 + 6/39 6/34 + 6/43
Table 3. (Continued) Accurate Angular Indexing
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
MILLING MACHINE INDEXING 1997
0.3170 11/18 − 5/17 34/59 − 14/54 0.3485 … 23/66
0.3171 13/41 13/41 0.3488 15/43 15/43
0.3180 22/37 − 13/47 6/54 + 12/58 0.3490 11/29 − 1/33 2/47 + 19/62
0.3182 … 21/66 0.3500 7/20 6/24 + 3/30
0.3190 6/27 + 3/31 3/34 + 9/39 0.3509 … 20/57
0.3191 15/47 15/47 0.3510 13/27 − 3/23 25/53 − 7/58
0.3200 16/47 − 1/49 8/25 0.3514 13/37 13/37

0.3208 … 17/53 0.3519 … 19/54
0.3210 25/49 − 7/37 10/59 + 10/66 0.3520 4/37 + 10/41 24/62 − 2/57
0.3214 … 9/28 0.3529 6/17 12/34
0.3220 18/39 − 6/43 18/39 − 6/43 0.3529 … 18/51
0.3220 … 19/59 0.3530 4/37 + 12/49 31/59 − 10/58
0.3226 10/31 20/62 0.3540 14/37 − 1/41 22/59 − 1/53
0.3230 21/41 − 7/37 21/41 − 7/37 0.3548 11/31 22/62
0.3235 … 11/34 0.3550 10/43 + 6/49 12/25 − 3/24
0.3240 3/23 + 6/31 21/47 − 7/57 0.3559 … 21/59
0.3243 12/37 12/37 0.3560 5/41 + 11/47 12/49 + 6/54
0.3250 2/16 + 4/20 3/24 + 5/25 0.3570 20/43 −
4/37 20/43 − 4/37
0.3256 14/43 14/43 0.3571 … 10/28
0.3260 21/49 − 4/39 23/59 − 3/47 0.3571 … 15/42
0.3261 … 15/46 0.3580 14/37 − 1/49 38/62 − 13/51
0.3265 16/49 16/49 0.3585 … 19/53
0.3270 24/49 − 7/43 17/58 + 2/59 0.3590 14/39 14/39
0.3276 … 19/58 0.3600 22/47 − 4/37 9/25
0.3280 26/41 − 15/49 15/51 + 2/59 0.3610 9/23 − 1/33 18/46 − 2/66
0.3290 5/21 + 3/33 23/43 − 7/34 0.3617 17/47 17/47
0.3300 4/47 + 12/49 6/24 + 2/25 0.3620 15/27 − 6/31 17/41 − 2/38
0.3310 17/31 − 5/23 23/59 − 3/51 0.3621 … 21/58
0.3320 28/43 − 15/47 30/59 − 9/51 0.3630 23/49 − 5/47 25/53 − 5/46
0.3330 7/43 + 8/47 36/51 − 22/59 0.3636 12/33 24/66
0.3333 5/15 8/24 0.3640 26/47 − 7/37 25/62 − 2/51
0.3333 6/18 10/30 0.3650 28/47 − 9/39 3/24 + 6/25
0.3333 7/21 13/39 0.3659 … 15/41
0.3333 9/27 14/42 0.3660 10/17 − 4/18 13/57 + 8/58
0.3333 11/33 17/51 0.3667 … 11/30
0.3333 13/39 18/54 0.3670 5/27 + 6/33

13/49 + 6/59
0.3333 … 19/57 0.3673 18/49 18/49
0.3333 … 22/66 0.3680 16/31 − 4/27 31/66 − 6/59
0.3340 7/41 + 8/49 29/47 − 15/53 0.3684 7/19 14/38
0.3350 21/37 − 10/43 9/24 − 1/25 0.3684 … 21/57
0.3360 28/41 − 17/49 9/46 + 8/57 0.3690 30/49 − 9/37 21/62 + 2/66
0.3370 2/39 + 14/49 33/57 − 15/62 0.3696 … 17/46
0.3380 10/23 − 3/31 25/62 − 3/46 0.3700 30/47 − 11/41 6/24 + 3/25
0.3387 … 21/62 0.3704 10/27 20/54
0.3390 19/49 − 2/41 20/59 0.3710 32/49 − 11/39 23/62
0.3396 … 18/53 0.3720 2/29 + 10/33 34/57 − 11/49
0.3400 25/49 − 8/47 6/25 + 3/30 0.3721 16/43 16/43
0.3404 16/47 16/47 0.3725 … 19/51
0.3410 12/27 − 3/29 22/46 − 7/51 0.3729 … 22/59
0.3415 14/41 14/41 0.3730 30/47 − 13/49 21/49 − 3/54
0.3420 4/21 + 5/33 25/62 − 3/49 0.3740 32/49 − 12/43 5/46 + 13/49
0.3421 … 13/38 0.3750 6/16 9/24
0.3430 13/23 − 6/27 37/57 −
15/49 0.3760 5/21 + 4/29 11/49 + 10/66
0.3440 2/39 + 12/41 14/54 + 5/59 0.3770 13/37 + 1/39 20/51 − 1/66
0.3448 … 20/58 0.3774 … 20/53
0.3450 2/23 + 8/31 15/24 − 7/25 0.3780 13/27 − 3/29 31/53 − 12/58
0.3460 18/41 − 4/43 18/41 − 4/43 0.3784 14/37 14/37
0.3469 17/49 17/49 0.3788 … 25/66
0.3470 7/31 + 4/33 7/38 + 7/43 0.3790 8/37 + 7/43 8/37 + 7/43
0.3478 8/23 16/46 0.3793 11/29 22/58
0.3480 20/33 − 8/31 31/59 − 11/62 0.3800 20/43 − 4/47 7/25 + 3/30
Table 3. (Continued) Accurate Angular Indexing
Part
of a

Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
1998 MILLING MACHINE INDEXING
0.3810 8/21 16/42 0.4120 18/41 − 1/37 24/53 − 2/49
0.3810 19/47 − 1/43 8/51 + 13/58 0.4130 2/39 + 17/47 19/46
0.3820 25/49 − 5/39 40/62 − 15/57 0.4138 12/29 24/58
0.3824 … 13/34 0.4140 19/39 − 3/41 19/39 − 3/41
0.3830 18/47 18/47 0.4146 17/41 17/41
0.3830 27/43 − 12/49 37/58 − 13/51 0.4150 18/33 − 3/23 9/24 + 1/25
0.3840 27/43 − 10/41 27/43 − 10/41 0.4151 … 22/53
0.3846 15/39 15/39 0.4160 21/39 − 6/49 41/62 − 13/53
0.3850 15/37 − 1/49 15/24 − 6/25 0.4167 … 10/24
0.3860 1/37 + 14/39 22/57 0.4170 26/37 − 14/49 10/38 + 6/39
0.3870 3/17 + 4/19 16/39 − 1/43 0.4180 8/21 + 1/27 16/46 + 4/57

0.3871 12/31 24/62 0.4186 18/43 18/43
0.3878 19/49 19/49 0.4190 18/39 − 2/47 31/46 − 13/51
0.3880 14/41 + 2/43 18/53 + 3/62 0.4194 13/31 26/62
0.3889 7/18 21/54 0.4200 24/49 − 3/43 8/25 + 3/30
0.3890 17/41 − 1/39 24/53 − 3/47 0.4210 1/39 + 17/43 23/49 − 3/62
0.3898 … 23/59 0.4211 8/19 16/38
0.3900 2/23 + 10/33 16/25 − 6/24 0.4211 … 24/
57
0.3902 16/41 16/41 0.4220 15/29 − 2/21 3/41 + 15/43
0.3910 14/31 − 2/33 29/66 − 3/62 0.4230 24/43 − 5/37 20/54 + 3/57
0.3913 9/23 18/46 0.4237 … 25/59
0.3920 14/33 − 1/31 17/47 + 2/66 0.4240 4/27 + 8/29 41/62 − 14/59
0.3922 … 20/51 0.4242 14/33 28/66
0.3929 … 11/28 0.4250 6/16 + 1/20 7/24 + 4/30
0.3930 1/39 + 18/49 28/46 − 11/51 0.4255 20/47 20/47
0.3939 13/33 26/66 0.4259 … 23/54
0.3940 3/39 + 13/41 24/53 − 3/51 0.4260 27/41 − 10/43 28/57 − 3/46
0.3947 … 15/38 0.4270 27/39 − 13/49 29/59 − 4/62
0.3950 26/37 − 12/39 13/25 − 3/24 0.4280 12/43 + 7/47 33/57 − 8/53
0.3953 17/43 17/43 0.4286 9/21 12/28
0.3960 4/29 + 8/31 33/47 − 15/49 0.4286 21/49 18/42
0.3962 … 21/53 0.4286 … 21/49
0.3966 … 23/58 0.4290 30/47 − 9/43 21/51 + 1/58
0.3970 25/41 − 10/47 7/57 + 17/62 0.4300 22/43 − 4/49 17/25 − 6/24
0.3980 3/16 + 4/19 28/58 −
5/59 0.4310 11/39 + 7/47 25/58
0.3990 7/39 + 9/41 6/37 + 9/38 0.4314 … 22/51
0.4000 6/15 10/25 0.4320 4/23 + 8/31 28/62 − 1/51
0.4000 8/20 12/30 0.4324 16/37 16/37
0.4010 2/37 + 17/49 27/62 − 2/58 0.4330 5/37 + 14/47 26/42 − 8/43

0.4020 5/43 + 14/49 16/49 + 4/53 0.4333 … 13/30
0.4030 26/49 − 6/47 30/47 − 12/51 0.4340 5/31 + 9/33 23/53
0.4032 … 25/62 0.4348 10/23 20/46
0.4035 … 23/57 0.4350 21/31 − 8/33 14/25 − 3/24
0.4040 11/39 + 5/41 11/39 + 5/41 0.4355 … 27/62
0.4043 19/47 19/47 0.4359 … 17/39
0.4048 … 17/42 0.4360 6/31 + 8/33 42/59 − 16/58
0.4050 29/41 − 13/43 3/24 + 7/25 0.4370 27/39 − 12/47 31/49 − 9/46
0.4054 15/37 15/37 0.4375 7/16 …
0.4060 21/47 − 2/49 17/58 + 7/62 0.4380 13/27 − 1/23 24/57 + 1/59
0.4068 … 24/59 0.4386 … 25/57
0.4070 9/19 − 1/15 7/47 + 16/62 0.4390 18/43 + 1/49 34/59 − 7/51
0.4074 11/27 22/54 0.4390 18/41 18/41
0
.4080 16/37 − 1/41 2/54 + 23/62 0.4394 … 29/66
0.4082 20/49 20/49 0.4400 8/41 + 12/49 11/25
0.4090 15/39 + 1/41 15/39 + 1/41 0.4407 … 26/59
0.4091 … 27/66 0.4410 10/37 + 7/41 10/37 + 7/41
0.4100 1/37 + 18/47 6/24 + 4/25 0.4412 … 15/34
0.4103 16/39 16/39 0.4419 19/43 19/43
0.4110 9/41 + 9/47 7/34 + 8/39 0.4420 18/33 − 3/29 34/62 − 5/47
0.4118 7/17 14/34 0.4430 4/39 + 16/47 20/51 + 3/59
0.4118 … 21/51 0.4440 9/41 + 11/49 14/51 + 10/59
Table 3. (Continued) Accurate Angular Indexing
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford

Cincinnati
and
LeBlond
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
MILLING MACHINE INDEXING 1999
0.4444 12/27 24/54 0.4737 … 27/57
0.4444 8/18 … 0.4740 9/37 + 9/39 9/34 + 9/43
0.4450 7/37 + 11/43 3/24 + 8/25 0.4746 … 28/59
0.4460 11/23 − 1/31 22/46 − 2/62 0.4750 6/16 + 2/20 9/24 + 3/30
0.4468 21/47 21/47 0.4760 4/43 + 18/47 15/53 + 11/57
0.4470 6/21 + 5/31 14/49 + 10/62 0.4762 10/21 20/42
0.4474 … 17/38 0.4770 26/43 − 6/47 30/47 − 10/62
0.4480 10/41 + 10/49 27/41 − 8/38 0.4780 12/31 + 3/33 24/62 + 6/66
0.4483 13/29 26/58 0.4783 11/23 22/46
0.4490 22/49 22/49 0.4790 22/39 − 4/47 10/53 + 18/62
0.4490 20/39 − 3/47 14/57 + 12/59 0.4800 16/39 + 3/43 12/25
0.4500 9/20 6/24 + 6/30 0.4810 14/41 + 6/43 22/58 + 6/59
0.4510 … 23/51 0.4815 13/27 26/54
0.4510 5/15 + 2/17 42/62 − 12/53 0.4820 33/49 − 9/47 19/46 + 4/58
0.4516 14/31 28/62 0.4828 14/29 28/58

0.4520 14/39 + 4/43 4/49 + 20/54 0.4830 27/39 − 9/43 27/39 − 9/43
0.4524 … 19/42 0.4839 15/31 30/62
0.4528 … 24/53 0.4840 5/37 + 15/43 24/46 − 2/53
0
.4530 3/23 + 10/31 16/59 + 12/66 0.4848 16/33 32/66
0.4540 14/27 − 2/31 1/54 + 27/62 0.4850 24/47 − 1/39 3/24 + 9/25
0.4545 15/33 30/66 0.4860 13/43 + 9/49 43/62 − 11/53
0.4550 25/47 − 3/39 9/24 + 2/25 0.4865 18/37 18/37
0.4560 9/37 + 10/47 17/62 + 12/66 0.4870 15/37 + 4/49 26/43 − 4/34
0.4561 … 26/57 0.4872 19/39 19/39
0.4565 … 21/46 0.4878 20/41 20/41
0.4570 4/37 + 15/43 27/39 − 8/34 0.4880 8/29 + 7/33 5/46 + 22/58
0.4576 … 27/59 0.4884 21/43 21/43
0.4580 27/49 − 4/43 20/53 + 5/62 0.4890 28/43 − 6/37 19/47 + 5/59
0.4583 … 11/24 0.4894 23/47 23/47
0.4590 35/49 − 12/47 18/51 + 7/66 0.4898 24/49 24/49
0.4595 17/37 17/37 0.4900 13/21 − 4/31 6/24 + 6/25
0.4600 16/41 + 3/43 9/25 + 3/30 0.4902 … 25/51
0.4610 13/39 + 6/47 22/34 − 8/43 0.4906 … 26/53
0.4615 18/39 18/39 0.4910 15/39 + 5/47 21/46 + 2/58
0.4620 15/47 + 7/49 36/62 − 7/59 0.4912 … 28/57
0.4630 … 25/
54 0.4915 … 29/59
0.4630 … 10/46 + 14/57 0.4920 25/37 − 9/49 17/46 + 6/49
0.4631 9/21 + 1/29 … 0.4930 8/41 + 14/47 21/53 + 6/62
0.4634 19/41 19/41 0.4940 33/49 − 7/39 14/46 + 11/58
0.4640 21/43 − 1/41 32/58 − 5/57 0.4950 5/29 + 10/31 9/24 + 3/25
0.4643 … 13/28 0.4960 8/23 + 4/27 20/53 + 7/59
0.4650 21/37 − 4/39 15/24 − 4/25 0.4970 33/47 − 8/39 7/46 + 20/58
0.4651 20/43 20/43 0.4980 20/37 − 2/47 29/41 − 9/43

0.4655 … 27/58 0.4990 26/41 − 5/37 26/41 − 5/37
0.4660 13/41 + 7/47 31/47 − 12/62 0.5000 8/16 12/24
0.4667 7/15 14/30 0.5000 9/18 14/28
0.4670 19/37 − 2/43 25/34 − 11/41 0.5000 10/20 15/30
0.4677 … 29/62 0.5000 … 17/34
0.4680 11/27 + 2/33 3/49 + 24/59 0.5000 … 19/38
0.4681 22/47 22/47 0.5000 … 21/42
0.4690 8/23 + 4/33 35/49 − 13/53 0.5000 … 23/46
0.4694 23/49 23/49 0.5000 … 27/54
0.4697 … 31/66 0.5000 … 29/
58
0.4700 19/29 − 5/27 18/25 − 6/24 0.5000 … 31/62
0.4706 8/17 16/34 0.5000 … 33/66
0.4706 … 24/51 0.5010 5/37 + 15/41 37/51 − 11/49
0.4710 12/39 + 8/49 12/47 + 11/51 0.5020 17/37 + 2/47 25/53 + 2/66
0.4717 … 25/53 0.5030 8/39 + 14/47 16/49 + 9/51
0.4720 20/39 − 2/49 31/53 − 7/62 0.5040 5/43 + 19/49 37/66 − 3/53
0.4730 6/39 + 15/47 29/59 − 1/54 0.5050 21/31 − 5/29 15/24 − 3/25
0.4737 9/19 18/38 0.5060 7/39 + 16/49 22/53 + 6/66
Table 3. (Continued) Accurate Angular Indexing
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Part

of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
2000 MILLING MACHINE INDEXING
0.5070 33/47 − 8/41 28/46 − 6/59 0.5370 … 29/54
0.5080 12/37 + 9/49 41/66 − 6/53 0.5370 … 6/51 + 26/62
0.5085 … 30/59 0.5371 17/41 + 6/49 …
0.5088 … 29/57 0.5380 4/18 + 6/19 12/49 + 17/58
0.5090 24/39 − 5/47 27/51 − 1/49 0.5385 21/39 21/39
0.5094 … 27/53 0.5390 26/39 − 6/47 34/51 − 6/47
0.5098 … 26/51 0.5400 25/41 − 3/43 6/25 + 9/30
0.5100 8/21 + 4/31 18/24 − 6/25 0.5405 20/37 20/37
0.5102 25/49 25/49 0.5410 12/47 + 14/49 2/38 + 21/43
0.5106 24/47 24/47 0.5417 … 13/24
0.5110 6/37 + 15/43 26/49 − 1/51 0.5420 4/43 + 22/49 7/46 + 23/59
0.5116 22/43 22/43 0.5424 … 32/59
0.5120 21/29 − 7/33 45/66 − 9/53 0.5430 33/43 − 11/49 22/54 + 8/59
0.5122 21/41 21/41 0.5435 … 25/46
0.5128 20/39 20/39 0.5439 … 31/57
0.5130 22/37 − 4/49 30/54 − 2/47 0.5440 4/37 + 17/39 4/37 + 17/39
0.5135 19/37 19/37 0.5450 3/39 + 22/47 15/24 − 2/25
0
.5140 30/43 − 9/49 33/46 − 12/59 0.5455 18/33 36/66

0.5150 1/39 + 23/47 16/25 − 3/24 0.5460 13/27 + 2/31 2/34 + 19/39
0.5152 17/33 34/66 0.5470 21/31 − 3/23 32/49 − 7/66
0.5160 28/43 − 5/37 37/59 − 6/54 0.5472 … 29/53
0.5161 16/31 32/62 0.5476 … 23/42
0.5170 13/39 + 9/49 9/49 + 17/51 0.5480 12/41 + 12/47 25/39 − 4/43
0.5172 15/29 30/58 0.5484 17/31 34/62
0.5180 9/47 + 16/49 31/41 − 10/42 0.5490 10/15 − 2/17 8/47 + 25/66
0.5185 14/27 28/54 0.5490 … 28/51
0.5190 27/41 − 6/43 6/49 + 23/58 0.5500 11/20 6/24 + 9/30
0.5200 3/41 + 21/47 13/25 0.5510 19/39 + 3/47 31/53 − 2/59
0.5210 17/39 + 4/47 41/59 − 8/46 0.5510 … 27/49
0.5217 12/23 24/46 0.5517 16/29 32/58
0.5220 19/31 − 3/33 14/47 + 13/58 0.5520 31/41 − 10/49 29/46 − 4/51
0.5230 17/43 + 6/47 14/49 + 14/59 0.5526 … 21/38
0.5238 11/21 22/42 0.5530 15/21 − 5/31 28/54 + 2/58
0.5240 29/47 − 4/43 32/51 − 6/58 0.5532 26/47 26/47
0.5250 6/16 + 3/2
0 7/24 + 7/30 0.5540 12/23 + 1/31 12/53 + 19/58
0.5254 … 31/59 0.5550 1/41 + 26/49 17/25 − 3/24
0.5260 28/37 − 9/39 26/46 − 2/51 0.5556 10/18 30/54
0.5263 10/19 20/38 0.5556 15/27 …
0.5263 … 30/57 0.5560 32/41 − 11/49 35/47 − 10/53
0.5270 32/47 − 6/39 6/53 + 24/58 0.5570 22/41 + 1/49 18/49 + 11/58
0.5280 19/39 + 2/49 35/59 − 3/46 0.5580 3/29 + 15/33 7/53 + 23/54
0.5283 … 28/53 0.5581 24/43 24/43
0.5290 18/37 + 2/47 30/53 − 2/54 0.5588 … 19/34
0.5294 9/17 18/34 0.5590 27/37 − 7/41 43/59 − 9/53
0.5294 … 27/51 0.5593 … 33/59
0.5300 5/27 + 10/29 6/24 + 7/25 0.5600 37/49 − 8/41 14/25
0.5303 … 35/66 0.5606 … 37/66

0.5306 26/49 26/49 0.5610 23/41 23/41
0.5310 15/23 − 4/33 24/37 − 4/34 0.5610 4/23 + 12/31 5/51 + 25/54
0.5319 25/47 25/47 0.5614 … 32/57
0.5320 7/27 + 9/33 5/51 + 23/53 0.5620 1/23 + 14/27 9/34 + 11/37
0.5323 … 33/
62 0.5625 9/16 …
0.5330 18/37 + 2/43 16/46 + 10/54 0.5630 12/39 + 12/47 22/46 + 5/59
0.5333 8/15 16/30 0.5640 25/33 − 6/31 41/49 − 18/66
0.5340 28/41 − 7/47 37/51 − 9/47 0.5641 22/39 22/39
0.5345 … 31/58 0.5645 … 35/62
0.5349 23/43 23/43 0.5650 10/31 + 8/33 3/24 + 11/25
0.5350 16/37 + 4/39 9/24 + 4/25 0.5652 13/23 26/46
0.5357 … 15/28 0.5660 4/39 + 19/41 9/46 + 20/54
0.5360 1/41 + 22/43 5/49 + 23/53 0.5660 … 30/53
0.5366 22/41 22/41 0.5667 … 17/30
Table 3. (Continued) Accurate Angular Indexing
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Part
of a
Turn
B&S, Becker,
Hendey, K&T,

& Rockford
Cincinnati
and
LeBlond
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
MILLING MACHINE INDEXING 2001
0.5670 33/47 − 5/37 25/47 + 2/57 0.5970 6/47 + 23/49 13/58 + 22/59
0.5676 21/37 21/37 0.5980 35/49 − 5/43 16/47 + 17/66
0.5680 23/31 − 4/23 21/47 + 8/66 0.5990 17/37 + 6/43 23/49 + 7/54
0.5686 … 29/51 0.6000 9/15 15/25
0.5690 … 33/58 0.6000 12/20 18/30
0.5690 28/39 − 7/47 42/59 − 7/49 0.6010 32/41 − 7/39 32/41 − 7/39
0.5700 21/43 + 4/49 6/24 + 8/25 0.6020 13/16 − 4/19 20/47 + 9/51
0.5710 9/43 + 17/47 39/57 − 6/53 0.6030 16/41 + 10/47 24/49 + 6/53
0.5714 12/21 16/28 0.6034 … 35/58
0.5714 28/49 24/42 0.6038 … 32/53
0.5714 … 28/49 0.6040 23/31 − 4/29 21/58 + 15/62
0.5720 31/43 − 7/47 40/58 − 6/51 0.6047 … 26/43
0.5730 12/39 + 13/49 23/57 + 10/59 0.6050 11/37 + 12/39 3/24 + 12/25
0.5740 14/41 + 10/43 23/37 − 2/42 0.6053 … 23/38
0.5741 … 31/54 0.6060 28/41 − 3/39 29/54 + 4/58
0.5745 27/47 27/47 0.6061 20/33 40/66
0.5750 3/15 + 6/1
6 9/24 + 6/30 0.6070 31/49 − 1/39 23/47 + 6/51
0.5758 19/33 38/66 0.6071 … 17/28
0.5760 21/29 − 4/27 24/49 + 5/58 0.6078 … 31/51
0.5763 … 34/59 0.6080 1/31 + 19/33 24/53 + 9/58
0.5770 5/37 + 19/43 32/46 − 7/59 0.6087 14/23 28/46
0.5780 2/21 + 14/29 25/49 + 4/59 0.6090 17/31 + 2/33 40/59 − 4/58

0.5789 11/19 22/38 0.6098 25/41 25/41
0.5789 … 33/57 0.6100 23/33 − 2/23 6/24 + 9/25
0.5790 26/43 − 1/39 38/62 − 2/59 0.6102 … 36/59
0.5800 3/43 + 25/49 12/25 + 3/30 0.6110 1/39 + 24/41 5/28 + 16/37
0.5806 18/31 36/62 0.6111 … 33/54
0.5810 21/39 + 2/47 18/53 + 14/58 0.6120 27/41 − 2/43 29/39 − 5/38
0.5814 25/43 25/43 0.6122 30/49 30/49
0.5820 6/21 + 8/27 23/38 − 1/43 0.6129 19/31 38/62
0.5830 11/37 + 14/49 8/46 + 27/66 0.6130 15/19 − 3/17 1/49 + 32/54
0.5833 … 14/24 0.6140 25/39 − 1/37 36/49 − 7/58
0.5840 18/39 + 6/49 13/57 + 21/59 0.6140 … 35/
57
0.5849 … 31/53 0.6150 22/37 + 1/49 9/24 + 6/25
0.5850 3/23 + 15/33 15/24 − 1/25 0.6154 24/39 24/39
0.5854 24/41 24/41 0.6160 10/41 + 16/43 14/53 + 19/54
0.5860 20/39 + 3/41 17/54 + 16/59 0.6170 12/37 + 12/41 5/59 + 33/62
0.5862 17/29 34/58 0.6170 29/47 29/47
0.5870 … 27/46 0.6176 … 21/34
0.5870 30/47 − 2/39 37/53 − 6/54 0.6180 5/39 + 24/49 3/53 + 32/57
0.5880 1/37 + 23/41 28/57 + 6/62 0.6190 1/43 + 28/47 17/53 + 17/57
0.5882 10/17 20/34 0.6190 13/21 26/42
0.5882 … 30/51 0.6200 23/43 + 4/47 8/25 + 9/30
0.5890 32/41 − 9/47 8/46 + 22/53 0.6207 … 36/58
0.5897 23/39 23/39 0.6210 29/37 − 7/43 6/46 + 26/53
0.5900 29/47 − 1/37 18/24 − 4/25 0.6212 … 41/66
0.5909 … 39/66 0.6216 23/37 23/37
0.5910 24/39 − 1/41 40/59 − 4/46 0.6220 14/27 + 3/29 15/53 + 20/59
0.5918 29/49 29/49 0.6226 … 33/53
0.5920 21/37 + 1/41 21/34 − 1/39 0.6230 24/37 − 1/39 24/37 −
1/39

0.5926 16/27 32/54 0.6240 5/29 + 14/31 4/49 + 32/59
0.5930 1/15 + 10/19 22/34 − 2/37 0.6250 10/16 15/24
0.5932 … 35/59 0.6260 12/43 + 17/49 21/46 + 10/59
0.5940 6/29 + 12/31 15/49 + 19/66 0.6270 17/47 + 13/49 24/46 + 6/57
0.5946 22/37 22/37 0.6271 … 37/59
0.5950 12/41 + 13/43 18/25 − 3/24 0.6275 … 32/51
0.5952 … 25/42 0.6279 27/43 27/43
0.5957 28/47 28/47 0.6280 23/33 − 2/29 28/47 + 2/62
0.5960 28/39 − 5/41 15/51 + 16/53 0.6290 11/39 + 17/49 12/54 + 24/59
0.5965 … 34/57 0.6290 … 39/62
0.5968 … 37/62 0.6296 17/27 34/54
Table 3. (Continued) Accurate Angular Indexing
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond

Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
2002 MILLING MACHINE INDEXING
0.6300 11/41 + 17/47 18/24 − 3/25 0.6610 … 39/59
0.6304 … 29/46 0.6613 … 41/62
0.6310 9/37 + 19/49 8/49 + 29/62 0.6620 13/23 + 3/31 36/53 − 1/58
0.6316 12/19 24/38 0.6630 35/49 − 2/39 11/39 + 16/42
0.6316 … 36/57 0.6640 13/41 + 17/49 33/51 + 1/59
0.6320 12/37 + 12/39 12/34 + 12/43 0.6650 16/37 + 10/43 15/24 + 1/25
0.6327 31/49 31/49 0.6660 34/41 − 8/49 21/51 + 15/59
0.6330 13/27 + 5/33 14/51 + 19/53 0.6667 10/15 16/24
0.6333 … 19/30 0.6667 12/18 20/30
0.6340 7/17 + 4/18 25/37 − 1/24 0.6667 14/21 26/39
0.6341 26/41 26/41 0.6667 18/27 28/42
0.6350 9/39 + 19/47 19/25 − 3/24 0.6667 22/33 34/51
0.6360 7/37 + 21/47 12/54 + 24/58 0.6667 26/39 36/54
0.6364 21/33 42/66 0.6667 … 38/57
0.6370 5/47 + 26/49 10/47 + 28/66 0.6667 … 44/66
0.6379 … 37/58 0.6670 24/41 + 4/49 5/51 + 33/58
0.6380 12/27 + 6/31 6/34 + 18/39 0.6680 14/41 + 16/49 11/47 + 23/53
0.6383 30/47 30/47 0.6690 5/23 + 14/31 10/46 + 28/62
0
.6390 14/23 + 1/33 28/39 − 3/38 0.6700 37/49 − 4/47 18/24 − 2/25
0.6400 4/37 + 25/47 16/25 0.6710 9/21 + 8/33 15/47 + 19/54
0.6410 … 45/66 − 2/49 0.6720 15/41 + 15//49 7/54 + 32//59
0.6410 25/39 25/39 0.6724 … 39/58
0.6415 … 34/53 0.6730 7/43 + 25//49 42/57 − 3//47
0.6420 23/37 + 1/49 20/59 + 20/66 0.6735 33/49 33/49
0.6429 … 18/28 0.6739 … 31/46
0.6429 … 27/42 0.6740 4/39 + 28/49 21/53 + 15/54

0.6430 41/37 − 20/43 24/51 + 10/58 0.6744 29/43 29/43
0.6440 31/43 − 3/39 31/43 − 3/39 0.6750 10/16 + 1/20 9/24 + 9/30
0.6441 … 38/59 0.6757 25/37 25/37
0.6450 33/43 − 6/49 3/24 + 13/25 0.6760 20/23 − 6/31 43/62 − 1/57
0.6452 20/31 40/62 0.6765 … 23/34
0.6460 23/37 + 1/41 2/47 + 35/58 0.6770 7/37 + 20/41 26/53 + 11/59
0.6470 8/39 + 19/43 24/47 + 9/66 0.6774 21/31 42/62
0.6471 11/17 22/34 0.6780 … 40/59
0.6471 … 33/51 0.6780 21/39 + 6
/43 6/49 + 30/54
0.6480 31/41 − 4/37 43/57 − 5/47 0.6786 … 19/28
0.6481 … 35/54 0.6790 7/37 + 24/49 19/51 + 19/62
0.6486 24/37 24/37 0.6792 … 36/53
0.6490 3/23 + 14/27 8/30 + 13/34 0.6800 31/47 + 1/49 17/25
0.6491 … 37/57 0.6809 32/47 32/47
0.6500 13/20 6/24 + 12/30 0.6810 21/27 − 3/31 29/41 − 1/38
0.6510 18/29 + 1/33 25/59 + 15/66 0.6818 … 45/66
0.6512 … 28/43 0.6820 15/37 + 13/47 37/51 − 2/46
0.6515 … 43/66 0.6829 28/41 28/41
0.6520 8/31 + 13/33 46/59 − 6/47 0.6830 5/17 + 7/18 35/57 + 4/58
0.6522 15/23 30/46 0.6840 31/37 − 6/39 13/47 + 22/54
0.6530 24/31 − 4/33 22/54 + 14/57 0.6842 13/19 26/38
0.6531 32/49 32/49 0.6842 … 39/57
0.6540 23/41 + 4/43 34/58 + 4/59 0.6850 15/41 + 15/47 3/24 + 14/25
0.6550 23/31 − 2/23 9/24 + 7/25 0.6852 … 37/54
0.6552 19/29 38/58 0.6860 3/23 + 15/27 19/49 + 17/57
0.6560 29/41 − 2/39 23/24 −
13/43 0.6863 … 35/51
0.6570 10/23 + 6/27 20/46 + 12/54 0.6870 28/37 − 3/43 36/51 − 1/53
0.6579 … 25/38 0.6875 11/16 …

0.6580 10/21 + 6/33 20/34 + 3/43 0.6880 13/21 + 2/29 30/49 + 5/66
0.6585 27/41 27/41 0.6890 36/47 − 3/39 42/53 − 6/58
0.6590 15/27 + 3/29 3/54 + 35/58 0.6897 20/29 40/58
0.6596 31/47 31/47 0.6900 21/37 + 6/49 6/24 + 11/25
0.6600 8/47 + 24/49 9/25 + 9/30 0.6905 … 29/42
0.6604 … 35/53 0.6910 35/49 − 1/43 21/57 + 20/62
0.6610 2/41 + 30/49 34/57 + 4/62 0.6920 35/43 − 5/41 35/43 − 5/41
Table 3. (Continued) Accurate Angular Indexing
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
MILLING MACHINE INDEXING 2003
0.6923 27/39 27/39 0.7234 … 34/47

0.6930 19/37 + 7/39 19/37 + 7/39 0.7240 3/27 + 19/31 34/41 − 4/38
0.6935 … 43/62 0.7241 21/29 42/58
0.6939 34/49 34/49 0.7250 2/16 + 12/20 7/24 + 13/30
0.6940 10/23 + 7/27 14/38 + 14/43 0.7255 … 37/51
0.6949 … 41/59 0.7258 … 45/62
0.6950 24/33 − 1/31 9/24 + 8/25 0.7260 34/41 − 6/47 2/49 + 37/54
0.6957 16/23 32/46 0.7270 15/19 − 1/16 14/54 + 29/62
0.6960 15/31 + 7/33 32/47 + 1/66 0.7273 24/33 48/66
0.6970 … 46/66 0.7280 23/37 + 5/47 23/49 + 15/58
0.6970 24/39 + 4/49 24/51 + 12/53 0.7288 … 43/59
0.6977 30/43 30/43 0.7290 38/49 − 2/43 12/47 + 27/57
0.6980 22/29 − 2/33 4/47 + 38/62 0.7297 27/37 27/37
0.6981 … 37/53 0.7300 11/27 + 10/31 6/24 + 12/25
0.6990 34/47 − 1/41 14/58 + 27/59 0.7310 15/37 + 14/43 26/59 + 18/62
0.7000 14/20 21/30 0.7317 30/41 30/41
0.7010 24/43 + 7/49 28/47 + 6/57 0.7320 20/37 + 9/47 26/57 + 16/58
0.7018 … 40/
57 0.7330 19/37 + 9/41 39/47 − 6/62
0.7020 10/21 + 7/31 7/37 + 20/39 0.7333 11/15 22/30
0.7021 33/47 33/47 0.7340 6/21 + 13/29 26/49 + 12/59
0.7027 26/37 26/37 0.7347 36/49 36/49
0.7030 25/31 − 3/29 23/58 + 19/62 0.7350 29/37 − 2/41 9/24 + 9/25
0.7037 19/27 38/54 0.7353 … 25/34
0.7040 8/37 + 20/41 47/59 − 5/54 0.7358 … 39/53
0.7050 19/37 + 9/47 15/24 + 2/25 0.7360 25/47 + 10/49 47/59 − 4/66
0.7059 12/17 24/34 0.7368 14/19 28/38
0.7059 … 36/51 0.7368 … 42/57
0.7060 18/37 + 9/41 38/58 + 3/59 0.7370 2/37 + 28/41 13/49 + 25/53
0.7069 … 41/58 0.7380 19/37 + 11/49 31/47 + 4/51
0.7070 6/39 + 26/47 7/30 + 18/38 0.7381 … 31/42

0.7073 29/41 29⁄ 41 0.7390 6/31 + 18/33 12/62 + 36/66
0.7080 30/39 − 3/49 13/58 + 30/62 0.7391 17/23 34/46
0.7083 … 17/24 0.7400 8/39 + 23/43 6/25 + 15/30
0.7090 34/39 − 7/43 31/46 + 2/57 0.7407 20/27 40/54
0.7097 22/31 44/62 0.7410 9/39 + 25/49 49/57 −
7/59
0.7100 20/43 + 12/49 18/24 − 1/25 0.7414 … 43/58
0.7105 … 27/38 0.7419 23/31 46/62
0.7110 22/29 − 1/21 33/39 − 5/37 0.7420 17/39 + 15/49 28/51 + 11/57
0.7119 … 42/59 0.7424 … 49/66
0.7120 6/39 + 24/43 31/54 + 8/58 0.7430 19/39 + 11/43 1/53 + 42/58
0.7121 … 47/66 0.7436 … 29/39
0.7130 27/43 + 4/47 17/30 + 6/41 0.7440 4/29 + 20/33 27/49 + 11/57
0.7140 6/43 + 27/47 45/57 − 4/53 0.7442 32/43 32/43
0.7143 15/21 20/28 0.7447 35/47 35/47
0.7143 35/49 30/42 0.7450 17/21 − 2/31 15/24 + 3/25
0.7143 … 35/49 0.7451 … 38/51
0.7150 28/43 + 3/47 21/25 − 3/24 0.7458 … 44/59
0.7160 2/47 + 33/49 25/51 + 14/62 0.7460 13/47 + 23/49 2/59 + 47/66
0.7170 … 38/53 0.7470 23/41 + 8/43 29/49 + 9/58
0.7170 29/43 + 2/47 28/59 + 16/66 0.7480 19/43 + 15/49 10/53 + 33/59
0.7174 … 33/46 0.7490 13/15 −
2/17 36/47 − 1/59
0.7179 28/39 28/39 0.7500 12/16 18/24
0.7180 22/27 − 3/31 21/58 + 21/59 0.7500 15/20 21/28
0.7190 39/49 − 3/39 12/57 + 30/59 0.7510 11/23 + 9/33 39/53 + 1/66
0.7193 … 41/57 0.7520 19/23 − 2/27 39/57 + 4/59
0.7200 2/43 + 33/49 18/25 0.7530 23/39 + 8/49 11/53 + 36/66
0.7209 31/43 31/43 0.7540 6/37 + 29/49 25/46 + 12/57
0.7210 13/29 + 9/33 21/47 + 17/62 0.7544 … 43/57

0.7220 18/23 − 2/33 13/46 + 29/66 0.7547 … 40/53
0.7222 13/18 39/54 0.7550 24/37 + 5/47 21/24 − 3/25
0.7230 6/29 + 16/31 11/46 + 30/62 0.7551 37/49 37/49
Table 3. (Continued) Accurate Angular Indexing
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
2004 MILLING MACHINE INDEXING
0.7560 1/47 + 36/49 9/47 + 35/62 0.7860 17/37 + 16/49 49/58 − 3/51
0.7561 31/41 31/41 0.7870 10/39 + 26/49 30/37 − 1/42
0.7568 28/37 28/37 0.7872 37/47 37/47
0.7570 15/43 + 20/49 8/53 + 40/66 0.7879 26/33 52/66
0.7576 25/33 50/66 0.7880 6/39 + 26/41 45/51 − 5/53

0.7580 16/37 + 14/43 48/59 − 3/54 0.7890 19/41 + 14/43 37/49 + 2/59
0.7581 … 47/62 0.7895 … 30/38
0.7586 22/29 44/58 0.7895 … 45/57
0.7590 28/47 + 8/49 36/41 − 5/42 0.7900 15/37 + 15/39 18/24 + 1/25
0.7593 … 41/54 0.7903 … 49/62
0.7600 39/47 − 3/43 19/25 0.7907 34/43 34/43
0.7609 … 35/46 0.7910 8/29 + 17/33 7/49 + 35/54
0.7610 19/43 + 15/47 34/51 + 5/53 0.7917 … 19/24
0.7619 16/21 32/42 0.7920 8/29 + 16/31 4/47 + 41/58
0.7620 38/47 − 2/43 16/51 + 26/58 0.7925 … 42/53
0.7627 … 45/59 0.7930 10/39 + 22/41 7/47 + 38/59
0.7630 14/37 + 15/39 36/46 − 1/51 0.7931 23/29 46/58
0.7632 … 29/38 0.7940 28/43 + 7/49 14/57 + 34/6
2
0.7640 29/39 + 1/49 27/57 + 18/62 0.7941 … 27/34
0.7647 13/17 26/34 0.7949 31/39 31/39
0.7647 … 39/51 0.7950 24/37 + 6/41 21/24 − 2/25
0.7650 16/27 + 5/29 3/24 + 16/25 0.7959 39/49 39/49
0.7660 36/47 36/47 0.7960 2/39 + 35/47 18/37 + 13/42
0.7660 13/37 + 17/41 4/37 + 25/38 0.7963 … 43/54
0.7667 … 23/30 0.7966 … 47/59
0.7670 14/41 + 20/47 31/38 − 2/41 0.7970 40/47 − 2/37 13/53 + 32/58
0.7674 33/43 33/43 0.7980 14/39 + 18/41 33/51 + 8/53
0.7680 21/41 + 11/43 21/41 + 11/43 0.7990 3/37 + 28/39 10/28 + 19/43
0.7690 16/47 + 21/49 15/54 + 28/57 0.8000 12/15 20/25
0.7692 30/39 30/39 0.8000 16/20 24/30
0.7700 14/23 + 5/31 6/24 + 13/25 0.8010 32/37 − 3/47 10/47 + 30/51
0.7710 21/39 + 10/43 48/59 − 2/47 0.8020 27/31 − 2/29 54/62 − 4/58
0.7719 … 44/57 0.8030 18/39 + 14/41 18/39 + 14/41
0.7720 2/37 + 28/39 2/37 + 28/39 0.8030 … 53/66

0.7727 … 51/
66 0.8039 … 41/51
0.7730 20/27 + 1/31 1/34 + 29/39 0.8040 10/43 + 28/49 32/49 + 8/53
0.7736 … 41/53 0.8043 … 37/46
0.7740 32/39 − 2/43 32/39 − 2/43 0.8049 33/41 33/41
0.7742 24/31 48/62 0.8050 22/23 − 5/33 3/24 + 17/25
0.7750 6/16 + 8/20 9/24 + 12/30 0.8060 34/41 − 1/43 13/47 + 27/51
0.7755 38/49 38/49 0.8065 25/31 50/62
0.7759 … 45/58 0.8070 5/15 + 9/19 15/58 + 34/62
0.7760 36/41 − 5/49 5/51 + 40/59 0.8070 … 46/57
0.7770 6/23 + 16/31 47/59 − 1/51 0.8080 19/21 − 3/31 22/39 + 10/41
0.7778 14/18 42/54 0.8085 38/47 38/47
0.7778 21/27 … 0.8090 22/39 + 12/49 28/53 + 16/57
0.7780 16/41 + 19/49 41/47 − 5/53 0.8095 … 34/42
0.7790 6/41 + 31/49 49/57 − 5/62 0.8100 33/43 + 2/47 6/24 + 14/25
0.7797 … 46/59 0.8103 … 47/58
0.7800 28/37 + 1/43 17/25 + 3/30 0.8108 30/37 30/37
0.7805 32/41 32/41 0.8110 7/27 + 16/29 34/53 + 10/59
0.7810 12/23 + 7/27
17/57 + 28/58 0.8113 … 43/53
0.7820 28/31 − 4/33 45/49 − 9/66 0.8120 17/29 + 7/31 34/58 + 14/62
0.7826 18/23 36/46 0.8125 13/16 …
0.7830 13/31 + 12/33 23/46 + 15/53 0.8130 6/43 + 33/49 16/24 + 6/41
0.7838 29/37 29/37 0.8136 … 48/59
0.7840 21/23 − 4/31 34/47 + 4/66 0.8140 35/43 35/43
0.7843 … 40/51 0.8140 28/33 − 1/29 14/47 + 32/62
0.7850 32/43 + 2/49 15/24 + 4/25 0.8148 22/27 44/54
0.7857 … 22/28 0.8150 22/47 + 17/49 9/24 + 11/25
0.7857 … 33/42 0.8158 … 31/38
Table 3. (Continued) Accurate Angular Indexing

Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
MILLING MACHINE INDEXING 2005
0.8160 5/37 + 32/47 23/34 + 6/43 0.8478 … 39/46
0.8163 40/49 40/49 0.8480 30/41 + 5/43 31/59 + 20/62
0.8170 12/17 + 2/18 13/54 + 34/59 0.8485 28/33 56/66
0.8180 30/39 + 2/41 33/54 + 12/58 0.8490 13/41 + 25/47 2/47 + 50/62
0.8182 27/33 54/66 0.8491 … 45/53
0.8190 26/37 + 5/43 20/34 + 9/39 0.8500 17/20 18/24 + 3/30
0.8200 28/39 + 5/49 8/25 + 15/30 0.8510 5/21 + 19/31 22/37 + 10/39
0.8205 32/39 32/39 0.8511 40/47 40/47
0.8210 10/21 + 10/29 10/59 + 43/66 0.8519 23/27 46/54

0.8214 … 23/28 0.8520 1/16 + 15/19 55/62 − 2/57
0.8220 18/41 + 18/47 11/57 + 39/62 0.8529 … 29/34
0.8226 … 51/62 0.8530 17/21 + 1/23 19/58 + 31/59
0.8230 34/39 − 2/41 4/49 + 43/58 0.8537 35/41 35/41
0.8235 14/17 28/34 0.8540 15/39 + 23/49 54/62 − 1/59
0.8235 … 42/51 0.8548 … 53/62
0.8240 15/37 + 18/43 19/53 + 27/58 0.8550 19/37 + 14/41 9/24 + 12/25
0.8246 … 47/57 0.8560 24/43 + 14/47 37/53 + 9/
57
0.8250 6/16 + 9/20 7/24 + 16/30 0.8570 3/43 + 37/47 51/57 − 2/53
0.8260 4/31 + 23/33 39/62 + 13/66 0.8571 18/21 24/28
0.8261 19/23 38/46 0.8571 42/49 36/42
0.8270 32/41 + 2/43 46/58 + 2/59 0.8571 … 42/49
0.8276 24/29 48/58 0.8580 25/43 + 13/47 38/51 + 7/62
0.8280 35/41 − 1/39 35/41 − 1/39 0.8590 11/27 + 14/31 22/54 + 28/62
0.8290 5/37 + 34/49 10/34 + 23/43 0.8596 … 49/57
0.8293 34/41 34/41 0.8600 1/43 + 41/49 9/25 + 15/30
0.8298 39/47 39/47 0.8605 37/43 37/43
0.8300 17/23 + 3/33 18/24 + 2/25 0.8610 16/37 + 21/49 18/46 + 31/66
0.8302 … 44/53 0.8620 13/37 + 24/47 17/38 + 17/41
0.8305 … 49/59 0.8621 25/29 50/58
0.8310 34/39 − 2/49 39/49 + 2/57 0.8627 … 44/51
0.8320 27/43 + 10/49 27/53 + 20/62 0.8630 38/41 − 3/47 18/46 + 25/53
0.8330 9/37 + 23/39 42/47 − 4/66 0.8636 … 57/66
0.8333 15/18 20/24 0.8640 11/16 + 3/17 56/62 − 2/51
0.8333 … 25/30 0.8644 … 51/
59
0.8333 … 35/42 0.8649 32/37 32/37
0.8333 … 45/54 0.8650 4/41 + 33/43 15/24 + 6/25
0.8333 … 55/66 0.8660 10/17 + 5/18 13/57 + 37/58

0.8340 15/23 + 6/33 20/38 + 12/39 0.8667 13/15 26/30
0.8350 43/49 − 2/47 21/24 − 1/25 0.8670 3/21 + 21/29 28/54 + 23/66
0.8360 2/41 + 37/47 32/46 + 8/57 0.8679 … 46/53
0.8367 41/49 41/49 0.8680 36/47 + 5/49 53/59 − 2/66
0.8370 19/29 + 6/33 33/57 + 16/62 0.8684 … 33/38
0.8372 … 36/43 0.8690 40/43 − 3/49 39/47 + 2/51
0.8378 … 31/37 0.8696 20/23 40/46
0.8380 7/39 + 27/41 20/46 + 25/62 0.8700 4/39 + 33/43 18/24 + 3/25
0.8387 26/31 52/62 0.8704 … 47/54
0.8390 30/39 + 3/43 3/49 + 42/54 0.8710 27/31 54/62
0.8400 19/37 + 16/49 21/25 0.8710 17/27 + 7/29 31/51 + 15/57
0.8410 23/43 + 15/49 44/51 − 1/46 0.8718 34/39 34/39
0.8420 34/37 − 3/39 46/49 − 6/62 0.8720 30/37 + 3/49 26/58 + 25/59
0.8421 16/19 32/38 0.8723 41/47 41/47
0.8421 … 48/
57 0.8730 15/39 + 21/43 21/49 + 24/54
0.8430 6/37 + 32/47 9/47 + 43/66 0.8740 15/39 + 23/47 5/53 + 46/59
0.8431 … 43/51 0.8750 14/16 21/24
0.8440 17/21 + 1/29 41/54 + 5/59 0.8760 21/23 − 1/27 48/57 + 2/59
0.8448 … 49/58 0.8770 3/37 + 39/49 37/51 + 10/66
0.8450 29/37 + 3/49 3/24 + 18/25 0.8772 … 50/57
0.8460 27/37 + 5/43 22/54 + 25/57 0.8776 43/49 43/49
0.8462 33/39 33/39 0.8780 24/47 + 18/49 31/53 + 17/58
0.8470 5/23 + 17/27 26/38 + 7/43 0.8780 36/41 36/41
0.8475 … 50/59 0.8788 … 58/66
Table 3. (Continued) Accurate Angular Indexing
Part
of a
Turn
B&S, Becker,

Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
2006 MILLING MACHINE INDEXING
0.8790 22/43 + 18/49 52/58 − 1/57 0.9110 31/37 + 3/41 31/37 + 3/41
0.8793 … 51/58 0.9118 … 31/34
0.8800 31/39 + 4/47 22/25 0.9120 26/37 + 9/43 52/43 − 11/37
0.8810 … 37/42 0.9123 … 52/57
0.8810 19/29 + 7/31 8/51 + 42/58 0.9130 2/31 + 28/33 35/62 + 23/66
0.8814 … 52/59 0.9130 21/23 42/46
0.8820 20/37 + 14/41 42/57 + 9/62 0.9138 … 53/58
0.8824 15/17 30/34 0.9140 7/21 + 18/31 42/47 + 1/49
0.8824 … 45/51 0.9149 43/47 43/47
0.8830 27/41 + 11/49 7/51 + 44/59 0.9150 8/17 + 8/18 21/24 + 1/25
0.8837 38/43 38/43 0.9153 … 54/59
0.8840 23/29 + 3/33 37/47 + 6/62 0.9160 35/43 + 5/49 40/53 + 10/62
0.8850 7/23 + 18/31 3/24 + 19/25 0.9167 … 22/24

0.8860 38/41 − 2/49 38/59 + 15/62 0.9170 19/23 + 3/33 29/38 + 6/39
0.8868 … 47/53 0.9180 1/41 + 42/47 39/46 + 4/57
0.8870 28/41 + 10/49 34/51 + 13/59 0.9184 45/49 45/49
0
.8871 … 55/62 0.9189 34/37 34/37
0.8880 18/41 + 22/49 28/51 + 20/59 0.9190 14/23 + 9/29 8/46 + 38/51
0.8889 16/18 48/54 0.9194 … 57/62
0.8889 24/27 … 0.9200 28/37 + 8/49 23/25
0.8890 8/41 + 34/49 53/57 − 2/49 0.9210 17/37 + 18/39 23/49 + 28/62
0.8900 39/41 − 3/49 6/24 + 16/25 0.9211 … 35/38
0.8910 29/41 + 9/49 52/57 − 1/47 0.9216 … 47/51
0.8913 … 41/46 0.9220 26/39 + 12/47 10/34 + 27/43
0.8919 33/37 33/37 0.9229 31/37 + 4/47 …
0.8920 19/41 + 21/49 17/47 + 35/66 0.9230 … 29/54 + 22/57
0.8929 … 25/28 0.9231 36/39 36/39
0.8930 27/37 + 8/49 5/46 + 40/51 0.9240 15/41 + 24/43 45/59 + 10/62
0.8936 42/47 42/47 0.9242 … 61/66
0.8939 … 59/66 0.9245 … 49/53
0.8940 27/29 − 1/27 28/49 + 20/62 0.9250 14/16 + 1/20 7/24 + 19/30
0.8947 17/19 34/38 0.9259 25/27 50/54
0.8947 … 51/57 0.9260 17/43 + 26/49 2/51 + 47/53
0.8950 30/41 + 8/49
9/24 + 13/25 0.9268 38/41 38/41
0.8960 20/41 + 20/49 8/47 + 45/62 0.9270 28/37 + 8/47 29/59 + 27/62
0.8966 26/29 52/58 0.9280 3/39 + 40/47 47/57 + 6/58
0.8970 14/43 + 28/49 7/57 + 48/62 0.9286 … 26/28
0.8974 35/39 35/39 0.9286 … 39/42
0.8980 44/49 44/49 0.9290 12/37 + 26/43 16/53 + 37/59
0.8980 1/39 + 41/47 28/57 + 24/59 0.9298 … 53/57
0.8983 … 53/59 0.9300 5/29 + 25/33 6/24 + 17/25

0.8990 8/39 + 34/49 42/51 + 4/53 0.9302 40/43 40/43
0.9000 18/20 27/30 0.9310 25/37 + 12/47 7/30 + 30/43
0.9010 28/29 − 2/31 27/58 + 27/62 0.9310 27/29 54/58
0.9020 20/27 + 5/31 46/51 0.9320 30/39 + 7/43 59/62 + 1/51
0.9020 … 29/53 + 22/62 0.9322 … 55/59
0.9024 37/41 37/41 0.9330 34/39 + 3/49 5/42 + 35/43
0.9030 17/41 + 21/43 17/41 + 21/43 0.9333 14/15 28/30
0.9032 28/31 56/62 0.9340 1/37 + 39/43 56/59 − 1/66
0.9040 17/41 + 23/47 7/53 + 44/57 0.9348 … 43/46
0.9048 19/21 38/42 0.9350 2/39 + 38/43 9/24 + 14
/25
0.9050 38/43 + 1/47 15/24 + 7/25 0.9355 29/31 58/62
0.9057 … 48/53 0.9360 15/37 + 26/49 13/58 + 42/59
0.9060 17/43 + 24/47 17/58 + 38/62 0.9362 44/47 44/47
0.9070 39/43 39/43 0.9370 19/21 + 1/31 29/53 + 23/59
0.9070 14/29 + 14/33 7/47 + 47/62 0.9375 15/16 …
0.9074 … 49/54 0.9380 13/39 + 26/43 21/46 + 26/54
0.9080 1/27 + 27/31 29/54 + 23/62 0.9388 46/49 46/49
0.9090 14/37 + 26/49 8/53 + 47/62 0.9390 30/37 + 5/39 30/37 + 5/39
0.9091 30/33 60/66 0.9394 31/33 62/66
0.9100 14/39 + 27/49 18/24 + 4/25 0.9400 35/39 + 2/47 16/25 + 9/30
Table 3. (Continued) Accurate Angular Indexing
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and

LeBlond
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
MILLING MACHINE INDEXING 2007
Approximate Indexing for Small Angles.—To find approximate indexing movements
for small angles, such as the remainder from the method discussed in Angular Indexing
starting on page 1990, on a dividing head with a 40:1 worm-gear ratio, divide 540 by the
number of minutes in the angle, and then divide the number of holes in each of the available
indexing circles by this quotient. The result that is closest to a whole number is the best
approximation of the angle for a simple indexing movement and is the number of holes to
0.9410 30⁄ 41 + 9/43 25/47 + 27/66 0.9670 9/47 + 38/49 8/34 + 30/41
0.9412 16/17 32/34 0.9677 30/31 60/62
0.9412 … 48/51 0.9680 26/37 + 13/49 2/46 + 49/53
0.9420 15/37 + 22/41 42/47 + 3/62 0.9690 26/39 + 13/43 5/51 + 54/62
0.9430 9/23 + 16/29 12/49 + 37/53 0.9697 32/33 64/66
0.9434 … 50/53 0.9700 12/23 + 13/29 6/24 + 18/25
0.9440 9/43 + 36/49 26/46 + 25/66 0.9706 … 33/34
0.9444 17/18 51/54 0.9710 26/37 + 11/41 14/46 + 34/51
0.9450 37/41 + 2/47 15/24 + 8/25 0.9720 26/43 + 18/49 31/53 + 24/62
0.9459 35/37 35/37 0.9730 36/37 36/37
0.9460 12/39 + 30/47 22/46 + 29/62 0.9730 20/23 + 3/29 26/54 + 29/59

0.9470 33/47 + 12/49 14/49 + 41/62 0.9737 … 37/38
0.9474 18/19 36/38 0.9740 16/21 + 7/33 26/34 + 9/43
0.9474 … 54/57 0.9744 38/39 38/39
0.9480 18/37 + 18/39 11/38 + 27/41 0.9750 10/16 + 7/20 13/24 + 13/30
0.9483 … 55/58 0.9756 40/41 40/41
0.9487 37/39 37/39 0.9760 14/39 + 29/47 10/49 + 44/5
7
0.9490 1/15 + 15/17 13/47 + 39/58 0.9762 … 41/42
0.9492 … 56/59 0.9767 42/43 42/43
0.9500 19/20 6/24 + 21/30 0.9770 33/37 + 4/47 30/47 + 21/62
0.9510 29/43 + 13/47 41/53 + 11/62 0.9780 25/37 + 13/43 25/37 + 13/43
0.9512 39/41 39/41 0.9783 … 45/46
0.9516 … 59/62 0.9787 46/47 46/47
0.9520 8/43 + 36/47 30/53 + 22/57 0.9790 13/23 + 12/29 10/53 + 49/62
0.9524 20/21 40/42 0.9796 48/49 48/49
0.9530 5/43 + 41/49 16/59 + 45/66 0.9800 23/39 + 16/41 17/25 + 9/30
0.9535 41/43 41/43 0.9804 … 50/51
0.9540 29/37 + 8/47 28/54 + 27/62 0.9810 22/43 + 23/49 51/58 + 6/59
0.9545 … 63/66 0.9811 … 52/53
0.9550 7/39 + 38/49 21/24 + 2/25 0.9815 … 53/54
0.9560 13/37 + 26/43 13/37 + 26/43 0.9820 30/39 + 10/47 19/46 + 33/58
0.9565 22/23 44/46 0.9825 … 56/57
0.9570 14/21 + 9/31 21/47 + 25/49 0.9828 … 57/58
0.9574 45/47 45/47 0.9830 26/41 + 15/43 45/57 + 12/62
0.9580 5/39 + 39
/47 20/53 + 36/62 0.9831 … 58/59
0.9583 … 23/24 0.9839 … 61/62
0.9590 21/41 + 21/47 18/51 + 40/66 0.9840 13/37 + 31/49 1/46 + 51/53
0.9592 47/49 47/49 0.9848 … 65/66
0.9600 7/39 + 32/41 24/25 0.9850 6/23 + 21/29 15/24 + 9/25

0.9608 … 49/51 0.9860 16/23 + 9/31 42/53 + 12/62
0.9610 11/23 + 14/29 5/34 + 35/43 0.9870 15/21 + 9/33 13/34 + 26/43
0.9620 28/41 + 12/43 52/59 + 5/62 0.9880 7/39 + 38/47 5/46 + 51/58
0.9623 … 51/53 0.9890 33/39 + 7/49 20/39 + 20/42
0.9630 26/27 52/54 0.9900 10/29 + 20/31 18/24 + 6/25
0.9630 30/43 + 13/49 1/51 + 50/53 0.9910 22/23 + 1/29 21/46 + 31/58
0.9640 21/39 + 20/47 52/57 + 3/58 0.9920 39/41 + 2/49 40/53 + 14/59
0.9643 … 27/28 0.9930 8/23 + 20/31 21/53 + 37/62
0.9649 … 55/57 0.9940 7/23 + 20/29 14/46 + 40/58
0.9650 11/39 + 28/41 3/24 + 21/
25 0.9950 35/39 + 4/41 21/24 + 3/25
0.9655 28/29 56/58 0.9960 40/41 + 1/49 43/46 + 3/49
0.9660 13/39 + 31/49 15/39 + 25/43 0.9970 15/23 + 10/29 30/46 + 20/58
0.9661 … 57/59 0.9980 20/41 + 25/49 12/51 + 45/59
0.9667 … 29/30 0.9990 10/41 + 37/49 6/51 + 52/59
Table 3. (Continued) Accurate Angular Indexing
Part
of a
Turn
B&S, Becker,
Hendey, K&T,
& Rockford
Cincinnati
and
LeBlond
Part
of a
Turn
B&S, Becker,
Hendey, K&T,

& Rockford
Cincinnati
and
LeBlond
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
2008 MILLING MACHINE INDEXING
be moved in the corresponding circle of holes. If the angle is greater than 9 degrees, the
whole number will be greater than the number of holes in the circle, indicating that one or
more full turns of the crank are required. Dividing by the number of holes in the indicated
circle of holes will reduce the required indexing movement to the number of full turns, and
the remainder will be the number of holes to be moved for the fractional turn. If the angle is
less than about 11 minutes, it cannot be indexed by simple indexing with standard B & S
plates (the corresponding angle for standard plates on a Cincinnati head is about 8 minutes,
and for Cincinnati high number plates, 2.7 minutes. See Tables 5, 6a, and 6b for indexing
movements with Cincinnati standard and high number plates).
Example:An angle of 7° 25′ is to be indexed. Expressed in minutes, it is 445′ and 540
divided by 445 equals 1.213483. The indexing circles available on standard B & S plates
are 15, 16, 17, 18, 19, 20, 21, 23, 27, 29, 31, 33, 37, 39, 41, 43, 47, and 49. Each of these
numbers is divided by 1.213483 and the closest to a whole number is found to be 17 ÷
1.213483 = 14.00926. The best approximation for a simple indexing movement to obtain
7° 25′ is 14 holes on the 17-hole circle.
Differential Indexing.—This method is the same, in principle, as compound indexing
(see Compound Indexing on page 1984), but differs from the latter in that the index plate is
rotated by suitable gearing that connects it to the spiral-head spindle. This rotation or dif-
ferential motion of the index plate takes place when the crank is turned, the plate moving
either in the same direction as the crank or opposite to it, as may be required. The result is
that the actual movement of the crank, at every indexing, is either greater or less than its
movement with relation to the index plate. The differential method makes it possible to
obtain almost any division by using only one circle of holes for that division and turning the

index crank in one direction, as with plain indexing.
The gears to use for turning the index plate the required amount (when gears are required)
are shown by Tables 4a and 4b, Simple and Differential Indexing with Browne & Sharpe
Indexing Plates, which shows what divisions can be obtained by plain indexing, and when
it is necessary to use gears and the differential system. For example, if 50 divisions are
required, the 20-hole index circle is used and the crank is moved 16 holes, but no gears are
required. For 51 divisions, a 24-tooth gear is placed on the wormshaft and a 48-tooth gear
on the spindle. These two gears are connected by two idler gears having 24 and 44 teeth,
respectively.
To illustrate the principle of differential indexing, suppose a dividing head is to be geared
for 271 divisions. Table 4b calls for a gear on the wormshaft having 56 teeth, a spindle gear
with 72 teeth, and a 24-tooth idler to rotate the index plate in the same direction as the
crank. The sector arms should be set to give the crank a movement of 3 holes in the 21-hole
circle. If the spindle and the index plate were not connected through gearing, 280 divisions
would be obtained by successively moving the crank 3 holes in the 21-hole circle, but the
gears cause the index plate to turn in the same direction as the crank at such a rate that,
when 271 indexings have been made, the work is turned one complete revolution. There-
fore, we have 271 divisions instead of 280, the number being reduced because the total
movement of the crank, for each indexing, is equal to the movement relative to the index
plate, plus the movement of the plate itself when, as here, the crank and plate rotate in the
same direction.
If they were rotated in opposite directions, the crank would have a total movement equal
to the amount it turned relative to the plate, minus the plate's movement. Sometimes it is
necessary to use compound gearing to move the index plate the required amount for each
turn of the crank. The differential method cannot be used in connection with helical or spi-
ral milling because the spiral head is then geared to the leadscrew of the machine.
Finding Ratio of Gearing for Differential Indexing.—To find the ratio of gearing for
differential indexing, first select some approximate number A of divisions either greater or
less than the required number N. For example, if the required number N is 67, the approxi-
Machinery's Handbook 27th Edition

Copyright 2004, Industrial Press, Inc., New York, NY
MILLING MACHINE INDEXING 2009
mate number A might be 70. Then, if 40 turns of the index crank are required for 1 revolu-
tion of the spindle, the gearing ratio R = (A − N) × 40/A. If the approximate number A is less
than N, the formula is the same as above except that A − N is replaced by N − A.
Example:Find the gearing ratio and indexing movement for 67 divisions.
The fraction 12⁄7 is raised to obtain a numerator and a denominator to match gears that are
available. For example, 12⁄7 = 48⁄28.
Various combinations of gearing and index circles are possible for a given number of
divisions. The index numbers and gear combinations in the accompanying Tables 4a and
4b apply to a given series of index circles and gear-tooth numbers. The approximate num-
ber A on which any combination is based may be determined by dividing 40 by the fraction
representing the indexing movement. For example, the approximate number used for 109
divisions equals 40 ÷ 6⁄16, or 40 × 16⁄6 = 106
2
⁄
3
. If this approximate number is inserted in
the preceding formula, it will be found that the gear ratio is 7⁄8, as shown in the table.
Second Method of Determining Gear Ratio: In illustrating a somewhat different method
of obtaining the gear ratio, 67 divisions will again be used. If 70 is selected as the approxi-
mate number, then 40⁄70 = 4⁄7 or 12⁄21 turn of the index crank will be required. If the
crank is indexed four-sevenths of a turn, sixty-seven times, it will make 4⁄7 × 67 = 38
2
⁄
7
rev-
olutions. This number is 1
5
⁄

7
turns less than the 40 required for one revolution of the work
(indicating that the gearing should be arranged to rotate the index plate in the same direc-
tion as the index crank to increase the indexing movement). Hence the gear ratio 1
5
⁄
7
= 12⁄7.
To Find the Indexing Movement.—The indexing movement is represented by the frac-
tion 40/A. For example, if 70 is the approximate number A used in calculating the gear ratio
for 67 divisions, then, to find the required movement of the index crank, reduce 40⁄70 to
any fraction of equal value and having as denominator any number equal to the number of
holes available in an index circle.
Use of Idler Gears.—In differential indexing, idler gears are used to rotate the index plate
in the same direction as the index crank, thus increasing the resulting indexing movement,
or to rotate the index plate in the opposite direction, thus reducing the resulting indexing
movement.
Example 1:If the approximate number A is greater than the required number of divisions
N, simple gearing will require one idler, and compound gearing, no idler. Index plate and
crank rotate in the same direction.
Example 2:If the approximate number A is less than the required number of divisions N,
simple gearing requires two idlers, and compound gearing, one idler. Index plate and crank
rotate in opposite directions.
When Compound Gearing Is Required.—It is sometimes necessary, as shown in the
table, to use a train of four gears to obtain the required ratio with the gear-tooth numbers
that are available.
Example:Find the gear combination and indexing movement for 99 divisions, assuming
that an approximate number A of 100 is used.
The final numbers here represent available gear sizes. The gears having 32 and 28 teeth are
the drivers (gear on spindle and first gear on stud), and gears having 40 and 56 teeth are

If A 70, gearing ratio 70 67–()
40
70
×
12
7

gear on spindle (driver)
gear on worm (driven)
====
To illustrate,
40
70

4
7

12
21

number of holes indexed
number of holes in index circle
== =
Ratio 100 99–()
40
100
×
4
10

41×
52×

32
40

28
56
×====
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
2010 MILLING MACHINE INDEXING
driven (second gear on stud and gear on wormshaft). The indexing movement is repre-
sented by the fraction
40
⁄
100
, which is reduced to
8
⁄
20
, the 20-hole index circle being used here.
Example:Determine the gear combination to use for indexing 53 divisions. If 56 is used
as an approximate number (possibly after one or more trial solutions to find an approxi-
mate number and resulting gear ratio coinciding with available gears):
The tooth numbers above the line here represent gear on spindle and first gear on stud. The
tooth numbers below the line represent second gear on stud and gear on wormshaft.
To Check the Number of Divisions Obtained with a Given Gear Ratio and Index
Movement.—Invert the fraction representing the indexing movement. Let C = this
inverted fraction and R = gearing ratio.

Example 1:If simple gearing with one idler, or compound gearing with no idler, is used:
number of divisions N = 40C − RC.
For instance, if the gear ratio is
12
⁄
7
, there is simple gearing and one idler, and the indexing
movement is
12
⁄
21
, making the inverted fraction C,
21
⁄
12
; find the number of divisions N.
Example 2:If simple gearing with two idlers, or compound gearing with one idler, is
used: number of divisions N = 40C + RC.
For instance, if the gear ratio is
7
⁄
8
, two idlers are used with simple gearing, and the index-
ing movement is 6 holes in the 16-hole circle, then number of divisions:
Sector Graduations
Gearing ratio 56 53–()
40
56
×
15

7

35×
17×

72 40×
24 56×
====
Indexing movement
40
56

5
7

57×
77×

35 holes
49-hole circle
=== =
N 40
21
12
×
⎝⎠
⎛⎞
12
7

21
12
×
⎝⎠
⎛⎞
–70
21
7
–67===
N 40
16
6
×
⎝⎠
⎛⎞
7
8

16
6
×
⎝⎠
⎛⎞
+ 109==
3
7
3
9
4
1

4
3
4
7
4
9
c
a
b
30
20
10
0
40
80
70
60
50
90
100
110
120
130
140
150
160
170
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
MILLING MACHINE INDEXING 2013

125 39 13/39 65 24 ……40 24 44
126 39 13/39 65 24 ……48 24 44
127 39 13/39 65 24 ……56 24 44
128 16 5/16 61 ………………
129 39 13/39 65 24 ……72 24 44
130 39 12/39 60 ………………
131 20 6/20 58 40 ……28 44 …
132 33 10/33 59 ………………
133 21 6/21 56 24 ……48 44 …
134 21 6/21 56 28 ……48 44 …
135 27 8/27 58 ………………
136 17 5/17 57 ………………
137 21 6/21 56 28 ……24 56 …
138 21 6/21 56 56 ……32 44 …
139 21 6/21 56 56 32 48 24 ……
140 49 14/49 55 ………………
141 18 5/18 54 48 ……40 44 …
142 21 6/21 56 56 ……32 24 44
143 21 6/21 56 28 ……24 24 44
144 18 5/18 54 ………………
145 29 8/29 54 ………………
146 21 6/21 56 28 ……48 24 44
147 21 6/21 56 24 ……48 24 44
148 37 10/37 53 ………………
149 21 6/21 56 28 ……72 24 44
150 15 4/15 52 ………………
151 20 5/20 48 32 ……72 44 …
152 19 5/19 51 ………………
153 20 5/20 48 32 ……56 44 …
154 20 5/20 48 32 ……48 44 …

155 31 8/31 50 ………………
156 39 10/39 50 ………………
157 20 5/20 48 32 ……24 56 …
158 20 5/20 48 48 ……24 44 …
159 20 5/20 48 64 32 56 28 ……
160 20 5/20 48 …
……………
161 20 5/20 48 64 32 56 28 … 24
162 20 5/20 48 48 ……24 24 44
163 20 5/20 48 32 ……24 24 44
164 41 10/41 47 ………………
165 33 8/33 47 ………………
166 20 5/20 48 32 ……48 24 44
167 20 5/20 48 32 ……56 24 44
168 21 5/21 47 ………………
169 20 5/20 48 32 ……72 24 44
170 17 4/17 45 ………………
171 21 5/21 47 56 ……40 24 44
172 43 10/43 44 ………………
173 18 4/18 43 72 56 32 64 ……
174 18 4/18 43 24 ……32 56 …
175 18 4/18 43 72 40 32 64 ……
176 18 4/18 43 72 24 24 64 ……
177 18 4/18 43 72 ……48 24 …
178 18 4/18 43 72 ……32 44 …
179 18 4/18 43 72 24 48 32 ……
180 18 4/18 43 ………………
181 18 4/18 43 72 24 48 32 … 24
182 18 4/18 43 72 ……32 24 44
183 18 4/18 43 48 ……32 24 44

184 23 5/23 42 ………………
185 37 8/37 42 ………………
Table 4b. (Continued) Simple and Differential Indexing
Browne & Sharpe Indexing Plates
No. of
Divi-
sions
Index
Circle
No. of
Turns of
Crank
Graduation
on
Sector
a
Gear
on
Wor m
No. 1 Hole
Gear
on
Spindle
Idlers
First Gear
on Stud
Second
Gear on
Stud
No. 1

Hole
No. 2
Hole
b
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
2014 MILLING MACHINE INDEXING
186 18 4/18 43 48 ……64 24 44
187 18 4/18 43 72 48 24 56 … 24
188 47 10/47 40 ………………
189 18 4/18 43 32 ……64 24 44
190 19 4/19 40 ………………
191 20 4/20 38 40 ……72 24 …
192 20 4/20 38 40 ……64 44 …
193 20 4/20 38 40 ……56 44 …
194 20 4/20 38 40 ……48 44 …
195 39 8/39 39 ………………
196 49 10/49 38 ………………
197 20 4/20 38 40 ……24 56 …
198 20 4/20 38 56 28 40 32 ……
199 20 4/20 38 100 40 64 32 ……
200 20 4/20 38 ………………
201 20 4/20 38 72 24 40 24 … 24
202 20 4/20 38 72 24 40 48 … 24
203 20 4/20 38 40 ……24 24 44
204 20 4/20 38 40 ……32 24 44
204 20 4/20 38 40 ……32 24 44
205 41 8/41 37 ………………
206 20 4/20 38 40 ……48 24 44
207 20 4/20 38 40 ……56 24 44

208 20 4/20 38 40 ……64 24 44
209 20 4/20 38 40 ……72 24 44
210 21 4/21 37 ………………
211 16 3/16 36 64 ……28 44 …
212 43 8/43 35 86 24 24 48 ……
213 27 5/27 36 72 ……40 44 …
214 20 4/20 38 40 56 32 64 … 24
215 43 8/43 35 ………………
216 27 5/27 36 ………………
217 21 4/21 37 48 ……64 24 44
218 16 3/16 36 64 ……56 24 44
219 21 4/21 37 28 ……48 24 44
220 33 6/33 35 ………………
221
17 3/17 33 24 ……24 56 …
222 18 3/18 32 24 ……72 44 …
223 43 8/43 35 86 8 24 64 … 24
224 18 3/18 32 24 ……64 44 …
225 27 5/27 36 24 ……40 24 44
226 18 3/18 32 24 ……56 44 …
227 49 8/49 30 56 64 28 72 ……
228 18 3/18 32 24 ……48 44 …
229 18 3/18 32 24 ……44 48 …
230 23 4/23 34 ………………
231 18 3/18 32 32 ……48 44 …
232 29 5/29 33 ………………
233 18 3/18 32 48 ……56 44 …
234 18 3/18 32 24 ……24 56 …
235 47 8/47 32 ………………
236 18 3/18 32 48 ……32 44 …

237 18 3/18 32 48 ……24 44 …
238 18 3/18 32 72 ……24 44 …
239 18 3/18 32 72 24 64 32 ……
240 18 3/18 32 ………………
241 18 3/18 32 72 24 64 32 … 24
242 18 3/18 32 72 ……24 24 44
243 18 3/18 32 64 ……32 24 44
244 18 3/18 32 48 ……32 24 44
245 49 8/49 30 ………………
Table 4b. (Continued) Simple and Differential Indexing
Browne & Sharpe Indexing Plates
No. of
Divi-
sions
Index
Circle
No. of
Turns of
Crank
Graduation
on
Sector
a
Gear
on
Wor m
No. 1 Hole
Gear
on
Spindle

Idlers
First Gear
on Stud
Second
Gear on
Stud
No. 1
Hole
No. 2
Hole
b
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
MILLING MACHINE INDEXING 2015
246 18 3/18 32 24 ……24 24 44
247 18 3/18 32 48 ……56 24 44
248 31 5/31 31 ………………
249 18 3/18 32 32 ……48 24 44
250 18 3/18 32 24 ……40 24 44
251 18 3/18 32 48 44 32 64 … 24
252 18 3/18 32 24 ……48 24 44
253 33 5/33 29 24 ……40 56 …
254 18 3/18 32 24 ……56 24 44
255 18 3/18 32 48 40 24 72 … 24
256 18 3/18 32 24 ……64 24 44
257 49 8/49 30 56 48 28 64 … 24
258 43 7/43 31 32 ……64 24 44
259 21 3/21 28 24 ……72 44 …
260 39 6/39 29 ………………
261 29 4/29 26 48 64 24 72 ……

262 20 3/20 28 40 ……28 44 …
263 49 8/49 30 56 64 28 72 … 24
264 33 5/33 29 ………………
265 21 3/21 28 56 40 24 72 ……
266 21 3/21 28 32 ……64 44 …
267 27 4/27 28 72 ……32 44 …
268 21 3/21 28 28 ……48 44 …
269 20 3/20 28 64 32 40 28 … 24
270 27 4/27 28 ………………
271 21 3/21 28 56 24 24 72 ……
272 21 3/21 28 56 ……64 24 …
273 21 3/21 28 24 ……24 56 …
274 21 3/21 28 56 ……48 44 …
275 21 3/21 28 56 ……40 44 …
276 21 3/21 28 56 ……32 44 …
277 21 3/21 28 56 ……24 44 …
278 21 3/21 28 56 32 48 24 ……
279
27 4/27 28 24 ……32 24 44
280 49 7/49 26 ………………
281 21 3/21 28 72 24 56 24 … 24
282 43 6/43 26 86 24 24 56 ……
283 21 3/21 28 56 ……24 24 44
284 21 3/21 28 56 ……32 24 44
285 21 3/21 28 56 ……40 24 44
286 21 3/21 28 56 ……48 24 44
287 21 3/21 28 24 ……24 24 44
288 21 3/21 28 28 ……32 24 44
289 21 3/21 28 56 24 24 72 … 24
290 29 4/29 26 ………………

291 15 2/15 25 40 ……48 44 …
292 21 3/21 28 28 ……48 24 44
293 15 2/15 25 48 32 40 56 ……
294 21 3/21 28 24 ……48 24 44
295 15 2/15 25 48 ……32 44 …
296 37 5/37 26 ………………
297 33 4/33 23 28 48 24 56 ……
298 21 3/21 28 28 ……72 24 44
299 23 3/23 25 24 ……24 56 …
300 15 2/15 25 ………………
301 43 6/43 26 24 ……48 24 44
302 16 2/16 24 32 ……72 24 …
303 15 2/15 25 72 24 40 48 … 24
304 16 2/16 24 24 ……48 44 …
305 15 2/15 25 48 ……32 24 44
306 15 2/15 25 40 ……32 24 44
Table 4b. (Continued) Simple and Differential Indexing
Browne & Sharpe Indexing Plates
No. of
Divi-
sions
Index
Circle
No. of
Turns of
Crank
Graduation
on
Sector
a

Gear
on
Wor m
No. 1 Hole
Gear
on
Spindle
Idlers
First Gear
on Stud
Second
Gear on
Stud
No. 1
Hole
No. 2
Hole
b
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
2016 MILLING MACHINE INDEXING
307 15 2/15 25 72 48 40 56 … 24
308 16 2/16 24 32 ……48 44 …
309 15 2/15 25 40 ……48 24 44
310 31 4/31 24 ………………
311 16 2/16 24 64 24 24 72 ……
312 39 5/39 24 ………………
313 16 2/16 24 32 ……28 56 …
314 16 2/16 24 32 ……24 56 …
315 16 2/16 24 64 ……40 24 …

316 16 2/16 24 64 ……32 44 …
317 16 2/16 24 64 ……24 44 …
318 16 2/16 24 56 28 48 24 ……
319 29 4/29 26 48 64 24 72 … 24
320 16 2/16 24 ………………
321 16 2/16 24 72 24 64 24 … 24
322 23 3/23 25 32 ……64 24 44
323 16 2/16 24 64 ……24 24 44
324 16 2/16 24 64 ……32 24 44
325 16 2/16 24 64 ……40 24 44
326 16 2/16 24 32 ……24 24 44
327 16 2/16 24 32 ……28 24 44
328 41 5/41 23 ………………
329 16 2/16 24 64 24 24 72 … 24
330 33 4/33 23 ………………
331 16 2/16 24 64 44 24 48 … 24
332 16 2/16 24 32 ……48 24 44
333 18 2/18 21 24 ……72 44 …
334 16 2/16 24 32 ……56 24 44
335 33 4/33 23 72 48 44 40 … 24
336 16 2/16 24 32 ……64 24 44
337 43 5/43 21 86 40 32 56 ……
338 16 2/16 24 32 ……72 24 44
339 18 2/18 21 24 ……56 44 …
340 17 2/17 22 ………………
341 43 5/43 21 86 24 32 40 ……
342
18 2/18 21 32 ……64 44 …
343 15 2/15 25 40 64 24 86 … 24
344 43 5/43 21 ………………

345 18 2/18 21 24 ……40 56 …
346 18 2/18 21 72 56 32 64 ……
347 43 5/43 21 86 24 32 40 … 24
348 18 2/18 21 24 ……32 56 …
349 18 2/18 21 72 44 24 48 ……
350 18 2/18 21 72 40 32 64 ……
351 18 2/18 21 24 ……24 56 …
352 18 2/18 21 72 24 24 64 ……
353 18 2/18 21 72 24 24 56 ……
354 18 2/18 21 72 ……48 24 …
355 18 2/18 21 72 ……40 24 …
356 18 2/18 21 72 ……32 24 …
357 18 2/18 21 72 ……24 44 …
358 18 2/18 21 72 32 48 24 ……
359 43 5/43 21 86 48 32 100 … 24
360 18 2/18 21 ………………
361 19 2/19 19 32 ……64 44 …
362 18 2/18 21 72 28 56 32 … 24
363 18 2/18 21 72 ……24 24 44
364 18 2/18 21 72 ……32 24 44
a
See Note on page 2011.
b
On B & S numbers 1, 1
1
⁄
2
, and 2 machines, number 2 hole is in the machine table. On numbers 3 and
4 machines, number 2 hole is in the head.
Table 4b. (Continued) Simple and Differential Indexing

Browne & Sharpe Indexing Plates
No. of
Divi-
sions
Index
Circle
No. of
Turns of
Crank
Graduation
on
Sector
a
Gear
on
Wor m
No. 1 Hole
Gear
on
Spindle
Idlers
First Gear
on Stud
Second
Gear on
Stud
No. 1
Hole
No. 2
Hole

b
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
2020 MILLING MACHINE INDEXING
137 D 137 40 173 F 173 40 218 C 109 20
138 A 69 20 174 E 87 20 220 D 44 8
139 C 139 40 175 E 175 40 220 A 99 18
140 F 28 8 176 D 44 10 220 F 143 26
140 E 42 12 177 A 177 40 222 B 111 20
140 D 77 22 178 D 89 20 224 F 28 5
140 A 91 26 179 D 179 40 226 F 113 20
141 B 141 40 180 B 36 8 228 A 171 30
142 F 71 20 180 A 99 22 230 C 46 8
143 F 143 40 180 C 153 34 230 A 69 12
144 B 36 10 181 C 181 40 230 E 161 28
145 E 87 24 182 A 91 20 232 E 87 15
146 E 73 20 183 B 183 40 234 A 117 20
147 A 147 40 184 C 46 10 235 B 141 24
148 B 111 30 184 A 69
15 236 A 177 30
149 E 149 40 184 E 161 35 238 E 119 20
150 A 30 8 185 B 111 24 240 A 30 5
151 D 151 40 186 C 93 20 240 B 36 6
152 F 38 10 187 F 187 40 240 E 42 7
152 E 133 35 188 B 141 30 240 A 48 8
152 A 171 45 189 A 189 40 242 D 121 20
153 C 153 40 190 F 38 8 244 B 183 30
154 D 77 20 190 E 133 28 245 A 147 24
155 C 93 24 190 A 171 36 246 C 123 20
156 A 117 30 191 E 191 40 248 C 93 15

157 B 157 40 192 A 48 10 250 E 175 28
158 C 79 20 193 D 193 40 252 A 189 30
159 F 159 40 194 B 97 20 254 B 127 20
160 F 28 7 195 A 117 24 255 C 153 24
160 D 32
8 196 A 147 30 256 D 32 5
160 B 36 9 197 C 197 40 258 A 129 20
260 E 26 4 304 F 38 5 354 A 177 20
260 A 91 14 305 B 183 24 355 F 71 8
260 F 143 22 306 C 153 20 356 D 89 10
260 B 169 26 308 D 77 10 358 D 179 20
262 F 131 20 310 C 93 12 360 B 36 4
264 A 99 15 312 A 117 15 360 A 99 11
265 F 159 24 314 B 157 20 360 C 153 17
266 E 133 20 315 A 189 24 362 C 181 20
268 B 67 10 316 C 79 10 364 A 91 10
270 B 81 12 318 F 159 20 365 E 73 8
270 A 189 28 320 D 32 4 366 B 183 20
272 C 34 5 320 A 48 6 368 C 46 5
274 D 137 20 322 E 161
20 370 B 111 12
276 A 69 10 324 B 81 10 372 C 93 10
278 C 139 20 326 D 163 20 374 F 187 20
280 F 28 4 328 C 123 15 376 B 141 15
280 E 42 6 330 A 99 12 378 A 189 20
280 D 77 11 332 F 83 10 380 F 38 4
280 A 91 13 334 C 167 20 380 E 133 14
282 B 141 20 335 B 67 8 380 A 171 18
284 F 71 10 336 E 42 5 382 E 191 20
285 A 171 24 338 B 169 20 384 A 48 5

286 F 143 20 340 C 34 4 385 D 77 8
288 B 36 5 340 E 119 14 386 D 193 20
290 E 87 12 340 F 187 22 388 B 97 10
292 E 73 10 342 A 171 20 390 A 117 12
294 A 147 20 344 A 129 15 392 A 147
15
295 A 177 24 345 A 69 8 394 C 197 20
296 B 111 15 346 F 173 20 395 C 79 8
298 E 149 20 348 E 87 10 396 A 99 10
300 A 30 4 350 E 175 20 398 B 199 20
302 D 151 20 352 D 44 5 400 A 30 3
Table 6b. (Continued) Indexing Movements for High Numbers
Cincinnati Milling Machine
No. of
Division
Side
Circle
Holes
No. of
Divisions
Side
Circle
Holes
No. of
Division
Side
Circle
Holes
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY

MILLING MACHINE INDEXING 2021
Indexing Tables.—Indexing tables are usually circular, with a flat, T-slotted table, 12 to
24 in. in diameter, to which workpieces can be clamped. The flat table surface may be hor-
izontal, universal, or angularly adjustable. The table can be turned continuously through
360° about an axis normal to the surface. Rotation is through a worm drive with a gradu-
ated scale, and a means of angular readout is provided. Indexed locations to 0.25° with
accuracy of ±0.1 second can be obtained from mechanical means, or greater accuracy from
an autocollimator or sine-angle attachment built into the base, or under numerical control.
Provision is made for locking the table at any angular position while a machining operation
is being performed.
Power for rotation of the table during machining can be transmitted, as with a dividing
head, for cutting a continuous, spiral scroll, for instance. The indexing table is usually
more rigid and can be used with larger workpieces than the dividing head.
Block or Multiple Indexing for Gear Cutting.—With the block system of indexing,
numbers of teeth are indexed at one time, instead of cutting the teeth consecutively, and the
gear is revolved several times before all the teeth are finished. For example, when cutting a
gear having 25 teeth, the indexing mechanism is geared to index four teeth at once (see
Table 7) and the first time around, six widely separated tooth spaces are cut. The second
time around, the cutter is one tooth behind the spaces originally milled. On the third index-
ing, the cutter has dropped back another tooth, and the gear in question is thus finished by
indexing it through four cycles.
The various combinations of change gears to use for block or multiple indexing are given
in the accompanying Table 7. The advantage claimed for block indexing is that the heat
generated by the cutter (especially when cutting cast iron gears of coarse pitch) is distrib-
uted more evenly about the rim and is dissipated to a greater extent, thus avoiding distor-
tion due to local heating and permitting higher speeds and feeds to be used.
Table 7 gives values for use with Brown & Sharpe automatic gear cutting machines, but
the gears for any other machine equipped with a similar indexing mechanism can be calcu-
lated easily. Assume, for example, that a gear cutter requires the following change gears
for indexing a certain number of teeth: driving gears having 20 and 30 teeth, respectively,

and driven gears having 50 and 60 teeth.
Then if it is desired to cut, for instance, every fifth tooth, multiply the fractions 20⁄60 and
30⁄50 by 5. Then 20⁄60 × 30⁄50 × 5⁄1 = 1⁄ 1. In this instance, the blank could be divided so
that every fifth space was cut, by using gears of equal size. The number of teeth in the gear
and the number of teeth indexed in each block must not have a common factor.
Table 7. Block or Multiple Indexing for Gear Cutting
Number
of Teeth
to be Cut
Number
Indexed
at Once
1st
Driver
1st
Follower
2nd
Driver
2nd
Follower
Turns of
Locking
Disk
Number
of Teeth
to be Cut
Number
Indexed
at Once
1st

Driver
1st
Follower
2nd
Driver
2nd
Follower
Turns of
Locking
Disk
25 4 100 50 72 30 4 36 5 100 48 80 40 4
26 3 100 50 90 52 4 37 5 100 30 90 74 4
27 2 100 50 60 54 4 38 5 100 30 90 76 4
28 3 100 50 90 56 4 39 5 100 30 90 78 4
29 3 100 50 90 58 4 40 3 100 50 90 80 4
30 7 100 30 84 40 4 41 5 100 30 90 82 4
31 3 100 50 90 62 4 42 5 100 30 90 84 4
32 3 100 50 90 64 4 43 5 100 30 90 86 4
33 4 100 50 80 44 4 44 5 100 30 90 88 4
34 3 100 50 90 68 4 45 7 100 50 70 30 4
35 4 100 50 96 56 4 46 5 100 30 90 92 4
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
2022 MILLING MACHINE INDEXING
47 5 100 30 90 94 4 119 3 100 70 72 68 2
48 5 100 30 90 96 4 120 7 100 50 70 40 2
49 5 100 30 90 98 4 121 4 60 66 96 44 2
50 7 100 50 84 40 4 123 7 100 30 84 82 2
51 4 100 30 96 68 2 124 5 100 60 90 62 2
52 5 100 30 90 52 2

125 7 100 50 84 50 2
54 5 100 30 90 54 2 126 5 100 50 50 42 2
55 4 100 50 96 44 2 128 5 100 60 90 64 2
56 5 100 30 90 56 2 129 7 100 30 84 86 2
57 4 100 30 96 76 2 130 7 100 50 84 52 2
58 5 100 30 90 58 2
132 5 100 88 80 40 2
60 7 100 30 84 40 2 133 4 100 70 96 76 2
62 5 100 30 90 62 2 134 5 100 60 90 67 2
63 5 100 30 80 56 2 135 7 100 50 84 54 2
64 5 100 30 90 64 2 136 5 100 60 90 68 2
65 4 100 50 96 52 2 138 5 100 92 80 40 2
66 5 100 44 80 40 2 140 3 50 50 90 70 2
67 5 100 30 90 67 2 141 5 100 94 80 40 2
68 5 100 30 90 68 2 143 6 90 66 96 52 2
69 5 100 46 80 40 2 144 5 100 60 90 72 2
70 3 100 50 90 70 2 145 6 100 50 72 58 2
72 5 100 30 90 72 2 147 5 100 98 80 40 2
74 5 100 30 90 74 2 148 5 100 60 90 74 2
75 7 100 30 84 50 2 150 7 100 60 84 50 2
76 5 100 30 90 76 2 152 5 100 60 90 76 2
77 4 100 70 96 44 2 153 5 100 68 80 60 2
78 5 100 30 90 78 2 154 5 100 56 72 66 2
80 3 100 50 90 80 2 155 6 100 50 72 62 2
81 7 100 30 84 52 2 156 5 100 60 90 78 2
82 5 100 30 90 82 2 160 7 100 50 84 64 2
84 5 100 30 90 84 2 161 5 100 70 60 46 2
85 4 100 50 96 68 2 162 7 100 60 84 52 2
86 5 100 30 90 86 2 164 5 100 60 90 82 2
87 7 100 30 84 58 2 165 7 100 50 84 66 2

88 5 100 30 90 88 2 168 5 100 60 90 84 2
90 7 100 30 70 50 2 169 6 96 52 90 78 2
91 3 100 70 72 52 2 170 7 100 50 84 68 2
92 5 100 30 90 92 2 171 5 70 42 80 76 2
93 7 100 30 84 62 2 172 5 100 60 90 86 2
94 5 100 30 90 94 2 174 7 100 60 84 58 2
95 4 100 50 96 76 2 175 8 100 50 96 70 2
96 5 100 30 90 96 2 176 5 100 60 90 88 2
98 5 100 30 90 98 2 180 7 100 60 70 50 2
99 10 100 30 80 44 2 182 9 90 56 96 52 2
100 7 100 50 84 40 2 184 5 100 60 90 92 2
102 5 100 30 60 68 2 185 6 100 50 72 74 2
104 5 100 60 90 52 2 186 7 100 60 84 62 2
105 4 100 70 96 60 2 187 5 100 44 48 68 2
108 7 100 30 70 60 2 188 5 100 60 90 94 2
110 7 100 50 84 44 2 189 5 100 60 80 84 2
111 5 100 74 80 40 2 190 7 100 50 84 76 2
112 5 100 60 90 56 2 192 5 100 60 90 96 2
114 7 100 30 84 76 2 195 7 100 50 84 78 2
115 8 100 50 96 46 2 196 5 100 60 90 98 2
116 5 100 60 90 58 2 198 7 100 50 70 66 2
117 8 100 30 96 78 2 200 7 60 60 84 40 2
Table 7. (Continued) Block or Multiple Indexing for Gear Cutting
Number
of Teeth
to be Cut
Number
Indexed
at Once
1st

Driver
1st
Follower
2nd
Driver
2nd
Follower
Turns of
Locking
Disk
Number
of Teeth
to be Cut
Number
Indexed
at Once
1st
Driver
1st
Follower
2nd
Driver
2nd
Follower
Turns of
Locking
Disk
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY
MILLING MACHINE INDEXING 2023

Table 8. Indexing Movements for 60-Tooth Worm-Wheel Dividing Head
Divisions
Index
Circle
No. of
Turns
No. of
Holes
Divisions
Index
Circle
No. of
Turns
No. of
Holes
Divisions
Index
Circle
No. of
Holes
Divisions
Index
Circle
No. of
Holes
2 Any 30 50 60 1 12 98 49 30 146 73 30
3 Any 20 51 17 1 3 99 33 20 147 49 20
4 Any 15 52 26 1 4 100 60 36 148 37 15
5 Any 12 53 53 1 7 101 101 60 149 149 60
6 Any 10 54 27 1 3 102 17 10 150 60 24

7 21 8 12 55 33 1 3 103 103 60 151 151 60
8 26 7 13 56 28 1 2 104 26 15 152 76 30
9 21 6 14 57 19 1 1 105 21 12 153 51 20
10 Any 6 58 29 1 1 106 53 30 154 77 30
11 33 5 15 59 59 1 1 107 107 60 155 31 12
12 Any 5 60 Any 1 108 27 15 156 26 10
13 26 4 16 61 61 60 109 109 60 157 157 60
14 21 4 6 62 31 30 110 33 18 158 79 30
15 Any 4 63 21 20 111 37 20 159 53 20
16 28 3 21 64 32 30 112 28 15 160 32 12
17 17 3 9 65 26 24 113 113 60 161 161 60
18 21 3 7 66 33 30 114 19 10 162 27 10
19 19 3 3 67 67 60 115 23 12 163 163 60
20 Any 3 68 17 15 116 29 15 164 41 15
21 21 2 18 69 23 20 117 39 20 165 33 12
22 33 2 24 70 21 18 118 59 30 166 83 30
23 23 2 14 71 71 60 119 119 60 167 167 60
24 26 2 13 72 60 50 120 26 13 168 28 10
25 60 2 24 73 73 60 121 121 60 169 169 60
26 26 2 8 74 37 30 122 61 30 170 17 6
27 27 2 6 75 60 48 123 41 20 171 57 20
28 21 2 3 76 19 15 124 31 15 172 43 15
29 29 2 2 77 77 60 125 100 48 173 173 60
30 Any 2 78 26 20 126 21 10 174 29 10
31 31 1 29 79 79 60 127 127 60 175 35 12
32 32 1 28 80 28 21 128 32 15 176 44 15
33 33 1 27 81 27 20 129 43 20 177 59 20
34 17 1 13 82 41 30 130 26 12 178 89 30
35 21 1 15 83 83 60 131 131 60 179 179 60
36 21 1 14 84 21 15 132 33 15 180 21 7

37 37 1 23 85 17 12 133 133 60 181 181 60
38 19 1 11 86 43 30 134 67 30 182 91 30
39 26 1 14 87 29 20 135 27 12 183 61 20
40 26 1 13 88 44 30 136 68 30 184 46 15
41 41 1 19 89 89 60 137 137 60 185 37 12
42 21 1 9 90 21 14 138 23 10 186 31 10
43 43 1 17 91 91 60 139 139 60 187 187 60
44 33 1 12 92 23 15 140 21 9 188 47 15
45 21 1 7 93 31 20 141 47 20 189 63 20
46 23 1 7 94 47 30 142 71 30 190 19 6
47 47 1 13 95 19 12 143 143 60 191 191 60
48 28 1 7 96 32 20 144 60 25 192 32 10
49 49 1 11 97 97 60 145 29 12 193 193 60
Machinery's Handbook 27th Edition
Copyright 2004, Industrial Press, Inc., New York, NY