BGE design a better saw guard
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One-Degree Imager (ODI), WIYN Observatory
Design a Better Miter Saw
Design a Better Guard
2
© 2008 Dassault Systèmes SolidWorks Corp. Confidential.
Design a Better Guard
3
You know the
speed of the
motor
4800 RPM
You know the
speed of the
blade
1100 RPM
(18.3 Hz)
© 2008 Dassault Systèmes SolidWorks Corp. Confidential.
Design a Better Guard
Will the
guard
excessively
vibrate?
4
?
© 2008 Dassault Systèmes SolidWorks Corp. Confidential.
Design a Better Guard
Initial Design
Frequency
Goal
SolidWorks
Reports
>23.8 Hz
10.2
12.4
16.6
18.8
5.0 Hz
Hz
Initial Design
Will Vibrate
Excessively
5
© 2008 Dassault Systèmes SolidWorks Corp. Confidential.
Design a Better Guard
Design Change 1:
Increase overall wall thickness
from 3mm to 4mm
(Increases weight 30% over initial
design)
Frequency
Goal
SolidWorks
Reports
>23.8 Hz
10.2
15.4
20.6
25.2
5.0 Hz
Hz
Design Will
Not Vibrate
Excessively
6
© 2008 Dassault Systèmes SolidWorks Corp. Confidential.
Design a Better Guard
Design Change 2:
Use 3mm wall thickness and add
external ribs
(Increases weight 1% over initial
design)
Frequency
Goal
SolidWorks
Reports
>23.8 Hz
13.9
19.5
2.0 Hz
5.6
9.8
Hz
Initial Design
Will Vibrate
Excessively
7
© 2008 Dassault Systèmes SolidWorks Corp. Confidential.
Design a Better Guard
Design Change 3:
Use 3mm wall thickness and added
internal ribs
(Increases weight 1% over initial
design)
Frequency
Goal
SolidWorks
Reports
>23.8 Hz
27.7
13.9
2.0 Hz
5.6
9.8
Hz
Design Will
Not Vibrate
Excessively
8
© 2008 Dassault Systèmes SolidWorks Corp. Confidential.
Design a Better Guard
Best Design
30 minutes
4 design iterations
0 prototypes
9
© 2008 Dassault Systèmes SolidWorks Corp. Confidential.
Vibration Analysis
Results
Blade Speed 1100 RPM (18.3 Hz)
10
First
Weight Weight
Natural
(grams) Increase Frequency
(Hz)
RPM
Percentage
Over Running
Speed
18.8
1128
3%
30%
1%
25.2
19.5
1512
1170
37%
6%
1%
27.6
1656
51%
Wall
Thickness
Rib
3
None
267
0
4
3
None
Outside
348
270
3
Inside
269
© 2008 Dassault Systèmes SolidWorks Corp. Confidential.
