BGE design a better saw guard

One-Degree Imager (ODI), WIYN Observatory Design a Better Miter Saw Design a Better Guard © 2008 Dassault Systèmes SolidWorks Corp Confidential Design a Better Guard 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? ? © 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  © 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  © 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  © 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  © 2008 Dassault Systèmes SolidWorks Corp Confidential Design a Better Guard Best Design 30 minutes design iterations prototypes  © 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 None 267 None Outside 348 270 Inside 269 © 2008 Dassault Systèmes SolidWorks Corp Confidential  ... Dassault Systèmes SolidWorks Corp Confidential Design a Better Guard Will the guard excessively vibrate? ? © 2008 Dassault Systèmes SolidWorks Corp Confidential Design a Better Guard Initial... Vibrate Excessively  © 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 a Better Guard © 2008 Dassault Systèmes SolidWorks Corp Confidential Design a Better Guard You know the speed of the motor 4800 RPM You know the speed of the blade 1100 RPM