Milosz Kardasinski wrote:

> Now for the good news, generally speaking, if the worm lead angle is 5
> degrees or less there is reasonable expectation of self-locking. Between
> (5,11] degrees of worm lead there is a percentage of back drive. Over 11
> degrees back driving can be expected.

Thanks for the rule of thumb :)  =


FWIW, the gear I've been talking about has around 7=B0. This makes it fall
into your "grey zone", and so it's not surprising that it does back drive.

Gerhard

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