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Unread 23-06-2002, 23:08
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Re: it's simple really! we had the same problem last year!

Posted by Jerry Eckert.

Engineer from Looking for a team in Raleigh, NC sponsored by .

Posted on 2/13/2000 12:12 PM MST


In Reply to: Re: it's simple really! we had the same problem last year! posted by Lora Knepper on 2/13/2000 8:49 AM MST:



: Though I know this post is a bit late, those joysticks have always been a problem for us. We've calibrated the joystics and the speed controllers for a temp fix. As a driver, I've gotten used to retrimming the joysticks on the fly, and even with tape (we tried both duct and electrical), it still is neccessary. I'm kind of curious if anyone has had the same problems, with a fix better than tape.

Tape is probably the best fix you will find, short of using a better joystick.

For those who have never disassembled one of the joysticks, there are two potentiometers inside the stick - one for the x-axis position and one for the y-axis. When the stick is moved the shaft of the potentiometer is rotated. The trim controls rotate the body of the potentiometer.

If the stick is moved vigorously or to the end of its rotation the entire potentiometer will move, which causes the value at the stick center position to change. If the trim knob is securely taped (not just using a thin strip of tape orthogonal to the rotational axis) the body of the potentiometer will move much less and the stick will tend to retain the trim setting.

Note that calibrating the speed controllers will NOT correct this problem. The speed controller calibration can correct an initial out-of-trim condition, but once the stick is moved the center values will change again and the control will once again require trimming. If you repeat the procedure enough times you may find a stable position, but in most cases it's quicker, easier, and more reliable to tape the trim controls.

Jerry


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