Thread: Forward/Reverse difference in drill motors.
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Unread 24-06-2002, 02:38
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It is really rather easy to fix...
Posted by Thomas A. Frank at 03/21/2001 2:27 PM EST


Engineer on team #121, The Islanders/Rhode Warrior, from Middletown (RI) High School and Naval Undersea Warfare Center.


In Reply to: Yes, it can be necessary
Posted by Matt Leese on 03/21/2001 12:53 PM EST:



Hello All;

This is one of those problems that can be fixed fairly easily. Let's assume you are directly driving the wheels on your machine. Take the side where the motor is going CCW for forward and disconnect it. Attach to the wheel a shaft that is slightly longer than the motor/gearbox assembly. Put a small sprocket on the end of this shaft. Put a small sprocket (same number of teeth as the previous step) on the output shaft of the drill assembly. Flip the drill assembly around so the sprockets line up, attach chain between them, mount drill assembly.

The motors are now going the same way for motion in the same direction. Your motor is off from where it was before by the diameter of the sprockets, which shouldn't be too far.

The reason you need to do this in some machines is because the drill motors work better (by roughly 10-15%) in the direction that is what is used to drill or drive IN screws (CW shaft output). Which makes sense, since it is usually harder to put screws in than take them out, so the drill maker has "retimed" the motor to work better in forward. Since FIRST won't let us modify the motors (so we can't readjust the timing), we have to resort to other approaches.

Makes a big difference in 2wd w/caster machines. In 4wd drive machines, it is less of a problem. And this year we have the drill motors geared down so far (to match the F-P assemblies), it is essentially invisible to us.

Tom Frank


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