I normally don't reply here but...

I've seen a small threaded hole with a set screw inserted in the threads 
after assembly parallel to the threaded object. Of course this will not 
allow for changes in insertion depth for the large threaded disk without 
drilling and tapping a new location for the set screw.

John

Andy Pugh wrote:
> Given a 12mm / 1/2" thick aluminium / aluminum disc / disk of 80mm /
> pi" diameter with a thread on the entire cylindrical circumference,
> how best to lock the thread in place in a way that can be easily
> reversed and which will not damage the threads in such as way as to
> inhibit dismantlement?
>
> Ideas I have include a sort-of tangential saw cut through a
> part-threaded (with a taper / first tap)  hole with a grub screw /
> setscrew in it (winding the screw into the unthreaded part pushes the
> slit open, locking the thread), A saw-cut in the plane of the disc /
> disk with a screw to locally squeeze or stretch the thread pitch to
> lock it, and a variant of the first idea where a wedge of the disc is
> cut out after the hole is part-threaded (possibly located with
> half-and-half roll pins).
>
> Any other ideas, or approaches that anyone has seen?
>
>    


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