One-Degree Imager ODI, WIYN Observatory Design a Better Miter Saw... Confidential.Design a Better Guard You know the speed of the blade 1100 RPM 18.3 Hz You know the speed of the... Desi
Trang 1One-Degree Imager (ODI), WIYN Observatory
Design a Better Miter Saw
Trang 2Design a Better Guard
Trang 33 © 2008 Dassault Systèmes SolidWorks Corp Confidential.
Design a Better Guard
You know the speed of the blade
1100 RPM (18.3 Hz)
You know the speed of the
Trang 4Design a Better Guard
Will the guard excessively
Trang 55 © 2008 Dassault Systèmes SolidWorks Corp Confidential.
Design a Better Guard
Initial Design
Will Vibrate
Frequency Goal
>23.8 Hz
SolidWorks Reports
5.0 Hz 10.2 Hz
Initial Design
Trang 6Design a Better Guard
Design Will
Not Vibrate
Frequency Goal
>23.8 Hz
SolidWorks Reports
5.0 Hz 10.2 Hz
Design Change 1:
Increase overall wall thickness
from 3mm to 4mm (Increases weight 30% over initial
design)
Trang 77 © 2008 Dassault Systèmes SolidWorks Corp Confidential.
Design a Better Guard
Initial Design
Will Vibrate
Frequency Goal
>23.8 Hz
SolidWorks Reports
2.0 Hz 13.9 Hz
Design Change 2:
Use 3mm wall thickness and add
external ribs
(Increases weight 1% over initial
design)
Trang 8Design a Better Guard
Design Will
Not Vibrate
Frequency Goal
>23.8 Hz
SolidWorks Reports
2.0 Hz 13.9 Hz
Design Change 3:
Use 3mm wall thickness and added
internal ribs
(Increases weight 1% over initial
design)
Trang 99 © 2008 Dassault Systèmes SolidWorks Corp Confidential.
Design a Better Guard
Best Design
30 minutes
4 design iterations
Trang 10Blade Speed 1100 RPM (18.3 Hz)
Wall
Thickness Rib (grams)Weight IncreaseWeight
First Natural Frequency (Hz)
RPM Over Running Percentage
Speed
3 None 267 0 18.8 1128 3%
4 None 348 30% 25.2 1512 37%
3 Outside 270 1% 19.5 1170 6%
Vibration Analysis
Results