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Unread 24-06-2002, 00:20
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Join Date: May 2001
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Re: Make 'em go the same direction!

Posted by Mike Gray at 2/7/2001 11:55 AM EST


Engineer on team HOT from Huron Valley Schools sponsored by GM Milford Proving Ground.


In Reply to: don't bother
Posted by Joe Ross on 2/6/2001 3:28 AM EST:




We discovered the speed difference in the drill motors in 1998 while trying to determine why the machine pulled to the left. After exhausting all the software/joystick/speed controller/mechanical possibilities, only the motors remained. We measured the forward and reverse speeds with a strobotach.

We found that that the speed difference is a huge 15-20% depending upon the applied voltage. Motor-to-motor variation is a low 2 percent.

With the drill motors rotating in the same direction, anyone can handle the machine well with a few minutes of practice. When the machine performs as expected, driver confidence soars.

The speed difference is caused by the motor, not the gearset.

After much thought, we found a pretty easy way to rotate them in the same direction. If my team members don't object, I'll post an AutoCAD rendering or photo.


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