On Thu, 28 May 2020 at 22:02, Chris Albertson <albertson.ch...@gmail.com> wrote:

> You tested the BS0 empty?  What if there is a casting mounted in it so as
> to present an eccentric load?  Also what if the machine operation places a
> force on the part that does not intersect the rotation axis?   The motor
> has to hold the part rigid while it is being milled.  OK I suspect the worm
> is not back drivable

I regularly drive a vehicle with a worm-drive rear axle. They are
back-drivable and they do not lock up under load.

But the motor resists being turned just as much as it exerts force to turn.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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