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Unread 09-02-2004, 19:47
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Dick Linn Dick Linn is offline
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Re: back-driveable vs. not

Just be mindful and use the correct diameter cable (if you are using cable). There is a definite working strength with cable, and it depends quite a lot on how you fasten it and the radius of the attachment used for the cable or whatever diameter pulleys are used. Leave a reasonable safety margin.

A 3/16 inch cable could be used with plenty of safety margin, or you could snap a cable of 1/8 inch or much larger if you don't engineer it correctly. If you have a cable running around a 1/4 inch bolt or something small, do you realize what stress that causes on the cable? Anything less than a couple of inches diameter should be carefully considered, even if you are oly lifting the robot a few times in the course of competition. Do be careful!
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Richard Linn

Proud father of Marine LCpl. Karl R. Linn
Co-founder Team 975
KIA, Iraq 1/26/2005