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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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