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Unread 29-04-2016, 19:12
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frcguy frcguy is offline
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AKA: Nicholas Dal Porto
FRC #5940 (B.R.E.A.D.)
Team Role: Tactician
 
Join Date: Dec 2015
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Location: Burlingame, California
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Quote:
Originally Posted by Mechvet View Post
For other teams to identify potential failures before they happen, would you mind expanding on the circumstances that led to the failure?

Specifically:
  • Wheel Size?
  • Overall reduction in gearbox?
  • Any additional reduction after the gearbox?
  • Did the failure happen while driving on flat ground, or as a result of an impact?

We noticed a similar failure (but in a 14 tooth), that can probably be attributed to sudden impact combined with materials that don't have impact resistance as a strong point.

There's quite a lot of good learning (and fun!) to be had going down the failure root cause analysis road.


Ok, I'll provide the details in order. Wheels are 8" AndyMark pneumatics. Overall reduction is the standard 2-CIM ball shifter from Vexpro with the 60:24 3rd stage. We're pretty sure it happened while being pushed by other robots and hitting defenses. Thankfully, the guys from 254 came through with some extra gears for this. I'll try to find Vexpro tomorrow to talk to them about it. Also, if you think that's crazy, I'll post a picture of one of that we stripped today that only has three teeth left .
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