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Unread 27-06-2003, 21:37
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Ianworld Ianworld is offline
AKA Ian Ferguson
AKA: Ian Ferguson
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Good thing i found this thread. I was about to try to build something like this without knowing the short comings.

From what i can tell though the real success of this type of drive would be where you put two drills( or another pair of motors) in conjuction.

Then drive one forwards at 100% power and drive the other in the other direction at 95% power. In a simplified system this would cause one to drive at its rated 19,470 rpm and another at 95% of that or 18500. The result combines these two rpms.

It would be 19,470 minus 18500 because that one is going backwards which results in a sense a negative rpm. This gives an rpm of about 1000 with twice the torque of the weaker motor or 190% of the torque of a drill motor. All the power with a 19.5 to 1 reduction.

you can then of course put both those motors driving forward at full power together to get about 40,000 rpm at full power with 200% torque. 40 times faster than the example i showed above. The problem of course then is finding ratios in the middle that work well by providing adequate rpm's and torque.

[edit] Hours later... I built a small differential out of legos and from what i can tell the first experiment is a failure. The torque appears to be much less when one is run backwards and rpm i subtracted from one motor. The result appears to be that it slowed down as predicted by adding the rpms together BUT the torque appears to have dwindled. Unfortunatly i don't have a way to measure the torque so i can't say how much.
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Last edited by Ianworld : 28-06-2003 at 00:19.
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