On Sun, 21 Nov 2021 at 07:45, John Dammeyer <jo...@autoartisans.com> wrote:

> In order to not have both the TTS and R8 collet drop out of the spindle I'd 
> like to be able to limit the number of turns to 2.

How about an end-stop in the draw bar? It would be fairly easy to have
something that simply "catches" the collet as it drops off the end of
the thread.
But you could also consider leaving the thread engaged and pulling up
against an internal collar (this is assuming that the drawbar thread
is smaller than the ID of the collet)

There is some risk of this jamming up, though, and it might put some
stress on the alignment pin if it is a pin rather than a key.

There are a number of rotation limiting designs onYoutube. This one
looks like it might work for your application, with only 2 or 3
layers:
https://www.youtube.com/watch?v=3airCg2Xd-4


Does a restrictor in the exhaust limit the wrench speed?

-- 
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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