Thanks,
I bought a second 1/2" socket wrench U-joint today. (The price is
right, anyway, and square drive is a simple system.) I think with the
two slightly out of line pivots, oriented at 90º to each other, the
two units might cancel each other's eccentricity out, where an odd
number couldn't.
It wants to flop around, if I twist one end and resist at the other,
but I think once the shafts are held with bearings it'll work okay.
Craig
=====
>I think that an odd number of u-joints will not give you a nearly
>constant velocity output. With even numbers the pairs tend to cancel
>the inherent distortion in u-joints.
>
>On Jun 6, 2012, at 1:05 PM, Craig Carmichael wrote:
>
>>
>>
>>
>>>U-joints? how long are they gonna put up with being power-stressed?
>>
>>I intend to find out. I think they should be more efficient than
>>gears. At least they should generate little heat, and I intend that
>>they'll be running in oil. I'm somewhat concerned about using just
>>two U-joints at 45º each, tho it would fit easiest. might be enough.
>>I'm more confident that three, each bending 30º, would run smoothly.
>>Four at 22.5º I hope would be overkill.
>>
>>If they wear out quickly I may end up getting more sophisticated and
>>making ones with bronze bushings or ball bearings for the job.
>>
>>Or there's CV joints, which are always twisting under power stress,
>>and with only grease for lubrication. I've never actually looked at
>>one open.
>>
>>The smaller it all can be, the thinner the bottom end can be.
>>
>>Craig
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