Re: 5C collet closer drawbar threading problem

Kim,

Just curious.... why are you using the collet's internal threads for
the drawbar? 5C collets are made to use the external thread for
closers. Not all 5C collets have the internal thread.

Doug

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Kim Lux <lux@d...> wrote:
> We just solved this problem.
>
> We cut the thread deeper and cleaned up the internal collet
threads.
> The collet can now be made to run true on the threads.
>
> Kim
>
>
>
> On Tue, 2003-07-08 at 12:39, Kim Lux wrote:
> > We are building an air operated 5C collet closer.
> >
> > The drawbar we are making is machined from a piece of seamless
> > mechanical tubing. We've got it adjusted for zero runout.
> >
> > We are cutting a 1.044" OD x 24 TPI thread on the outside of a
1.250"
> > piece of tubing turned down to 1.030" This will pull on the
internal
> > thread of the collet to close it in the chuck.
> >
> > We've threaded two of these drawbars now and both times the
collet has
> > significant runout when threaded to the drawbar. Why ? The
thread
> > seems to be high quality. The collet seems to be OK. The
drawbar runs
> > true. Why does the collet have runout when screwed on ?
> >
> > What is the solution to this problem ?
> >
> > I'm tempted to cut the thread loose so that the collet can
center itself
> > in the chuck irrespective of the drawbar position.
> >
> > Any help would be appreciated. Thanks.
> >
> >
> >
> > Kim Lux <lux@d...>
> >
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> Kim Lux <lux@d...>