Re: [CAD_CAM_EDM_DRO] Depth of piece

There are things called spindle stops which wedge themselves in the
spindle bore and not in the collet. If the parts are so short that
they don't reach into the spindle bore then a bar is attached to the
stop that extends up into the collet. Also most collets repeat pretty
good in Z if the parts are all the same diameter and the collet is
tightened up the same amount every time.

Roland Jollivet wrote:

> Hi
>
> Can anyone tell me how a cnc machine references length in a collet chuck?
> Example. If I have a number of 1/4in x 1in rods, and I want to round the one
> end. The final, total length must be exact.
> Manually, I would face both ends, measure it, chuck it, and reference to the
> protruding end, then round it
>
> In a collet chuck, the piece is pulled in with the chuck, so a back stop
> can't be used?
> So how would a cnc lathe using a collet chuck(and front loading) round a 100
> pieces? What is the procedure?
>
> I think that maybe the answer is that a CNC machine with collet chuck feeds
> the work out, so it would;
> - turn the end round
> - part off
>
> Regards
> Roland