What are these in my lathe chuck?
#1
Hi Folks,

I recently bought an ER32 collet chuck and am looking at making an adapter plate to mount it on my Proxxon PD400.  While inspecting my 3-jaw chucks to see how it is mounted, I saw 3 set screws at the back that aren't holding anything.

Are they there as alignment pins? If not, what purpose do they serve?

   

   
Wongster
http://www.wongstersproduction.com

Proud to be a member of MetalworkingFun Forum since Mar 2012.
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#2
Judging purely from their position, I would say they are retaining the key spindles. You may find that where you have removed one, the key now unwinds the spindle rather than adjusting the jaws.
Lathe (n); a machine tool used in the production of milling machine components.

Milling Machine (n); a machine tool used in the production of lathe components.
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