Chief Delphi - pic: 35 MPH Prototype

Chief Delphi (http://www.chiefdelphi.com/forums/index.php)

- Robot Showcase (http://www.chiefdelphi.com/forums/forumdisplay.php?f=58)

- - pic: 35 MPH Prototype (http://www.chiefdelphi.com/forums/showthread.php?t=36470)

Re: pic: 35 MPH Prototype

In 2004 for some reason someone thought 4:1 would be a good ratio to gear down the CIMs to the 12" skyway wheels. The bot moved all right, but it sounded angry. ugh... that thing was hard enough to control with a 13:1 gear down, I would have hated to try to drive it at 4:1... 2 side wheels, and a castor at each corner...

Very nice to see something as just proof of concept. :D

Re: pic: 35 MPH Prototype

Quote:

Originally Posted by M. Krass

That is approximately the CIM motors free speed. The motors are operating under load, so the actual output RPM is going to be something far lower than that. Additionally, if you're using the FIRST provided circuit breakers, the motors will draw more than 40A under load at a speed considerably lower than 5200 RPM, were they ever to go that fast.

If your robot were traveling 35 MPH, it'd be able to cross a football field in six seconds. Can it?

if you have efficient gearboxes the motor should be able to get fairly close to its rated freespeed.

it'll just take a while to get there, but the only resistive forces it would need to overcome would be innefficiency in the gearbox and wind resistance.