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Unread 06-08-2015, 07:48
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MechE
AKA: Craig Rochester
FTC #8470 (Team Technado)
Team Role: Mentor
 
Join Date: Jan 2012
Rookie Year: 2012
Location: Boston
Posts: 317
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Re: [FTC]: Drive Platform- Design Exercise

Looked at stress in square shaft. Assumed round shaft 2.5mm diam and 500 in-oz (3.53 Nm) and plugged into this on-line calculator: TORSION OF SOLID AND HOLLOW SHAFTS

It returns 160 kPSI (1100 MPa). That about 5x the the stress to break a steel rod. It's not looking good for the square shaft. Now I need to look at the gears; they probably aren't designed for the torque either...

Last edited by DavisDad : 06-08-2015 at 15:06. Reason: fixed 500 in-lb --> 500 in-oz
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