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Unread 08-01-2007, 23:41
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Teaching Teachers to Teach Tech
AKA: Jason Brett
no team (British Columbia FRC teams)
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Re: Using two CIMs in the Banebots Transmission

Quote:
Originally Posted by lynca View Post
The kit sprockets (28 tooth and 16 tooth), give a reduction of 1.75:1 , in addition to the 12:1 , which is around 21:1 ,

5280 no load rpm ---> 251 rpm with the reduction ,. this still seems kind of fast with the standard kit size wheels, are you using other sprockets not provided in the kit ?
251 rpm is 4.2 revs per second. With a 6" dia. wheel the circumference is 18.8 inches, giving a theoretical top speed of 6.6 feet per second. (Or 2m/s aka 7.2km/h) With smaller wheels, you'll be slower.

Depending on your team's strategy you might like the pushing power that offers or you might want to move faster. I'm looking at the opportunity for direct drive from the tranny output shaft and a bit more speed.

Someone earlier posted about how best to drive a 6wd chassis with four gearboxes. I'd say direct drive to two axles and chains or belts linking all three axles.

Jason

Last edited by dtengineering : 08-01-2007 at 23:46.