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Unread 30-11-2011, 23:34
Jared Russell's Avatar
Jared Russell Jared Russell is offline
Taking a year (mostly) off
FRC #0254 (The Cheesy Poofs), FRC #0341 (Miss Daisy)
Team Role: Engineer
 
Join Date: Nov 2002
Rookie Year: 2001
Location: San Francisco, CA
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Re: Gearing for 20 FPS?

6 motors geared for 20 fps will draw a LOT of current at stall (when starting, pushing, or turning in a skid steer arrangement). More than I'd want to design for; you risk resetting the cRIO (if you use the original 8 slot model) or the wireless gaming adapter due to momentary drops in supply voltage when drawing 600+ amps of current. You will then be sitting lame on the field for 20+ seconds while the component reboots.

With 4 motors, 20 fps will result in a woefully slowly accelerating bot.

Both of the above statements assume a bot at or near the weight limit plus bumpers and battery - obviously, a robot that weighs 80 lbs soaking wet can be geared faster and still accelerate at a good clip (although since it is soaking wet, maybe not). Maybe those crazy Cheesy Poof guys who design ridiculously fast welterweight bots are on to something