Re: collets

Hi Marcus,

For example, let's consider a 5C collet. It has to be rough
machined....not too hard. Then heat treated such that the split
sections all have the same amount of spring-open.....that might be
fairly hard to do. Then the OD needs to be ground, presumably with
the collet in a closed position.....could be fairly hard without some
fancy fixturing. Once the OD is ground, then the ID presents some
grinding problems.......it also must be ground with the collet in a
closed position. With the exception of the rough machining all of
the operations would present a challenge to the typical machine shop,
not to mention the home shop.

I'd certainly like to hear about your collet making methods. .0001"
or better concentricity? How did you measure that?


thanks,

Doug

--- In CAD_CAM_EDM_DRO@y..., "Marcus & Eva" <implmex@a...> wrote:
> Hi Doug:
> Which part of the collet do you think is difficult to make?
> I've made them with concentricity down to 0.0001" or better without
any
> trouble at all.
> Some of my homemade wonders are better for runout than the Lyndex
collets I
> can buy.
> Course they cost a lot more to make than to buy when you factor in
your shop
> rate, so I only make what I can't get any other way.
> But it's really not a difficult job.
>
> Cheers
>
> Marcus
> -----Original Message-----
> From: dougrasmussen@c... <dougrasmussen@c...>
> To: CAD_CAM_EDM_DRO@y... <CAD_CAM_EDM_DRO@y...>
> Date: Friday, November 09, 2001 8:12 AM
> Subject: [CAD_CAM_EDM_DRO] Re: collets
>
>
> >--- In CAD_CAM_EDM_DRO@y..., Sven Peter <peteryco@r...> wrote:
> >Sven,
> >
> >I'm very pessimistic when people tell me they have success making
> >collets with the typical lathe/mill setups in home shops. Sorry
> >guys, but I lump you into the same group as those who tell me they
> >can sharpen drills by hand as well as can be done on drill
sharpening
> >machines.
> >
> >Doug
> >
> >
> >> Hi Ian,
> >> I have seen a lot of machines and a few big ones but nothing
> >compared
> >> with this. My tries always ran out of center without cylindrical
> >> grinder. And even sometimes with it.
> >> Have fun making collets.
> >> Sven Peter
> >>
> >> Iain Ward wrote:
> >> >
> >> > I do not have to worry about drill wander over the 29" length
of
> >> > the collet.
> >> > Damnedest thing I've seen, 20" draw bar on a 29" long collet.
The
> >> > spindle bore is trumpet shaped and has 16" of contact surface
for
> >> > compressing the collet.
> >> >
> >> > Sorry for the ramble, but hopefully it helps.
> >> >
> >> > Iain
> >> >
> >
> >
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