Re: re: tapers post (for smoke)

Smoke,

There is a distinction between tool holding (precision shank size)
and work holding (variable stock size) collets. R8 is a tool holding
collet, I think I was told the tapers in spindle and on collet can be
the same since the grip range is very small. A tool holding collet
is typically drawn in with much more force than a workholding collet,
that combined with the precision tool shank and short grip range
makes identical tapers workable. I don't recall on the R8, but some
tool holding collets are not self releasing.

5C is a work holding collet, we were told to grind the spindle so
the contact was only on the outer end of the 5C collet when gripping
stock of the nominal diameter of the collet. In a workholding collet
with a full contact taper there are issues of friction and sticking
instead of easy self release, both of which are undesireable for
quick and easy action in work holding.

doug

--- In CAD_CAM_EDM_DRO@egroups.com, "Smoke" <Smoke@5...> wrote:
> I would assume the reason for that is when using s spilt collet of
any kind,
> the taper would actually get less as the collet closed in on the
tool shank.
> How much would depend on the amount of close in.
>
> Waht would your thoughts on this be?
>
> Smoke
> -----Original Message-----
> From: dougrasmussen@c... <dougrasmussen@c...>
> To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
> Date: Sunday, November 12, 2000 8:26 PM
> Subject: [CAD_CAM_EDM_DRO] Re: re: tapers post (for smoke)
>
>
> >Smoke,
> >
> >Regarding tapers....you mentioned making some tooling for 5C, etc.
> >In case you're making a spindle to seat a 5C, be aware that on work
> >holding collets like 5C's the seat and the collet don't have the
> >exact same taper. I've forgotten all the details, but when we were
> >regrinding the 5C taper in one of our Hardinge lathes Hardinge
techs
> >told us to have the spindle angle something like about one degree
off
> >from the collet angle.
> >
> >Not sure if the above is true for a tool holding collet like an R8.
> >
> >Doug
> >
> >
> >
> >--- In CAD_CAM_EDM_DRO@egroups.com, "Smoke" <Smoke@5...> wrote:
> >> Ah..thanks...I hadn't gone to the web page that shows the 5C
> >collets. I was
> >> looking at the spindle nose page.
> >>
> >> Smoke
> >>
> >> -----Original Message-----
> >> From: ballendo@y... <ballendo@y...>
> >> To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
> >> Date: Sunday, November 12, 2000 5:59 PM
> >> Subject: [CAD_CAM_EDM_DRO] Re: re: tapers post (for smoke)
> >>
> >>
> >> >Smoke,
> >> >
> >> >At:
> >> >
> >> >http://www.cox-internet.com/drspiff/HSM/Collets/Collets.htm
> >> >
> >> >Under R8 OAL is 3.98 . length TO taper is 2.93 . So taper
length
> >is
> >> >1.03. As mentioned before, diameters (taper) are given.
> >> >
> >> >Under 5C Length of taper is called out as 16.3 . Again, dia.
are
> >> >given.
> >> >
> >> >
> >> >Hope this helps
> >> >
> >> >Ballendo
> >> >
> >> >
> >> >>Nope...the overall length is show but nothein tha thows length
of
> >> >>taper.
> >> >>Smoke
> >> >
> >> >
> >> >
> >> >
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