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Re: pic: Messing around
Pat,
As far as the gearing goes:
I'm positive you don't need 2 stages for 8 fps from a 5500 RPM output motor.
Try dropping it to one stage, and utilizing a much larger initial reduction.
With a large single stage gear reduction, you should be able to get a nice sprocket reduction which scales to any wheel size (ie: 10:20 for a 4" Wheel, 10:30, for a 6" Wheel, 10:40, for an 8" Wheel, etc).
I'm in love with 10 tooth output sprockets for exactly this reason. It allows for a larger chain reduction (by sacrificing chain wrap, I know...)
Also, #35 - 10 tooths come with a TON of bore sizes.
John
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In the interest of full disclosure: I work for VEX Robotics a subsidiary of Innovation First International (IFI) Crown Supplier & Proud Supporter of FIRST
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