Reaming tapping

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Machining Processes
Turning & Hold making


Contents
CK14KSTN-Nhom5

Drilling
Boring
Reaming
Tapping
Turning and hold making


CK14KSTN-Nhom5

Reaming

Reaming is an operation used to:
+ Make an existing hole dimensionally more
accurate than can be achieved by drilling alone
+ Improve its surface finish.

Turning and hold making


Reamer

CK14KSTN-Nhom5

A multiple-cutting-edge tool

Straight
edges

Helically
fluted
edges

Turning and hold making


Reamer

CK14KSTN-Nhom5

Remove material
on the diameter of a drilled hole

Soft metal
0.2mm

Hard metal
0.13mm

remove very little material.
Turning and hold making

Reamer

CK14KSTN-Nhom5

The type of reamer

Machine
reamers

Hand
reamers

Rose
reamers

Fluted
reamers
Turning and hold making


CK14KSTN-Nhom5

Reamer

Hand reamers are straight or have a tapered end in the
first third of their length
Rose reamers have cutting edges with Wide margins
and no relief

Fluted reamers have small margins and relief, with a
rake angle of about 5°

Turning and hold making


CK14KSTN-Nhom5

Reamer

Besides:
Shell reamers generally are used for holes larger
than 20 mm
Expansion reamers are adjustable for small
variations in hole size and also to compensate
for wear of the reamer’s cutting edges.
Adjustable reamers can be set for specific hole
diameters and therefore are versatile
Turning and hold making


CK14KSTN-Nhom5

Reamer

Terminology for a helical reamer

Turning and hold making

CK14KSTN-Nhom5

Reamer

Terminology for a helical reamer

Turning and hold making


Reamer

CK14KSTN-Nhom5

Reamers may
be held rigidly
(as in a chuck)
Holder
Reamers may
float in their
holdingfixtures
Turning and hold making


CK14KSTN-Nhom5

Reamer
High-speed steels
(Ml, MZ, and M7)

materials

Solid carbides
(K2O; C2)
Carbide cutting
edges.
Turning and hold making


CK14KSTN-Nhom5

Tapping

A tap is a chip-producing threading tool with
multiple cutting teeth
+ Internal and external threads in workpieces
can be produced by tapping
+ Taps generally are available with two, three,
or four flutes

Tapping & taps


Tapping

CK14KSTN-Nhom5

The type of tapping

Machine
tapping

Hand
tapping

Drilling machines

Automatic screw
machines

vertical CNC
milling machines
Tapping & taps


CK14KSTN-Nhom5

Tapping

Hand tapping

Tapping & taps


CK14KSTN-Nhom5

Tapping

Machine tapping

Tapping & taps

CK14KSTN-Nhom5

Tapping

Some other type:
Tapered taps are designed to reduce the torque
required for the tapping of through holes
Bottoming taps are for tapping blind holes to
their full depth
Collapsible taps are used in large-diameter holes
Tapping & taps


CK14KSTN-Nhom5

Tapping

Terminology for a tap


CK14KSTN-Nhom5

Tapping

Tapping of steel nuts in production

Tapping & taps

CK14KSTN-Nhom5

Tapping

Materials: High-speed steels (Ml, M2, M7 & M10)
Productivity in tapping operations can be
improved by high-speed tapping
Self-reversing tapping systems also have been
improved significantly
Operating speeds can be as high as 5000 rpm
Tapping & taps