On 2013-09-09, Tom Gardner Mars@Tacks wrote:
I have an application where a 1" dia. shaft is hard to R-62 and a part
is attached with two opposing 3/8" cup-point set screws. The part has a
cam follower on it and rotating the part on the shaft then locking it
with the set screws is a positioning adjustment. There is about 75
pounds of force on the part. I hate this set-up! I just don't trust it
not to slip but I can't think of a better way of locking the part on the
shaft yet be able to adjust it easily.

Hmm ... A cup-head won't do much for you unless it can deform
the shaft -- which then makes subsequent adjustments more difficult.

Instead -- there are setscrews with a soft ball end (something
like silver or aluminum in a cup point) so it deforms and grips the
shaft without deforming the shaft.

Or consider putting annealed copper slugs turned to be the
minor diameter of the thread or a bit smaller under the cup-point (or
better, flat-point) setscrew. Every so many re-adjustments, pull out
the copper slugs and replace with fresh ones, as they will work harden.

Good Luck,
DoN.

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