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Unread 11-03-2016, 09:42
OccamzRazor's Avatar
OccamzRazor OccamzRazor is offline
Go YETI!
AKA: Robbie
FRC #3506 (YETI)
Team Role: Engineer
 
Join Date: Jan 2009
Rookie Year: 2003
Location: Charlotte, North Carolina
Posts: 169
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Re: Scaling Winch Motor Help

3506 is using a Mini-CIM on a vex versa planetary gearbox with a ratio of 63:1 on a 2" diameter spool. We realize most teams forget this but when the power to your robot shuts off you need a brake to keep your robot from back driving so we used a small pneumatic cylinder as a brake. It deploys into a cam attached to the winch spool shaft to stop the decent of our robot when the power shuts off.

We had the fastest and most reliable climber at the event with this setup but we did have a small failure on one of the sun gears that we are not sure about. It might have been overloaded, it might have been a defect but either way we had to take the gearbox apart and put a new stage in right before finals.
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2015 NC Regional Chairman's Award
2016 NC Guilford District Event Winner
2016 NC Guilford District Chairman's Award
2016 NC District Championship Winner
2016 NC Regional Chairman's Award
2016 NC Woodie Flowers Award Finalist - Lia Schwinghammer