RE: [CAD_CAM_EDM_DRO] Re: collets

Thanks Doug and everyone that has replied. Do you know the approximate
dimensions of the 3c or 4c? I was comparing mine to the 5c in a pix and it
looks the same, just smaller. It's a little less than 7/8 inch in diameter
(body, not the flare) and about 3" long. Must be real thin as the bore is
for a 3/4" bit and the inserts for the larger bits. Sorry I can't be more
precise with measurements but all I have here at home is the small collet
(9/16 bore, takes inserts for small bits up to 3/8, I think) and a tape
measure. Brought it home to take to MSC tomorrow & see if it looks familiar
to them.

Lew

-----Original Message-----
From: dougrasmussen@... [mailto:dougrasmussen@...]
Sent: Thursday, November 08, 2001 9:06 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: collets

Lew,

The only Black Diamond grinder I'm faimiliar with used a 3C collet
for the smaller bushings.

Since they used a standard type collet for the those bushings, maybe
the one you need is also a standard. Possibly a 4C? Have you tried
checking whether Hardinge has their collet catalog online? My old
Hardinge collet catalog has virtually every common collet listed with
specs. Unfortunately, no listing for Black Diamond, though. You
might give Hardinge a call, 1-800-843-8801.


Doug

--- In CAD_CAM_EDM_DRO@y..., "LEW BEST" <bcl@c...> wrote:
> Hi All
>
> Sorry to post this to so many lists, I know some of you are on
multiple
> lists and this will get repetitious.
>
> I need to try to make a collet. The design is like a 5C with
external
> threads but much smaller. An R8 is only slightly larger in outside
diameter
> (I thought I might be able to turn down and externally thread an
R8, would
> also need to slightly flatten the nose taper. However after
reading the
> specs in the Mcmaster catalog I feel they are probably too hard
steel to
> turn.
>
> The collet I need is for a Black Diamond 31 drill grinder, is the
large
> collet that holds the larger bushings and the 3/4" bit for
sharpening. BD
> wants $120 some-odd for the one collet so I'd like to try to turn
one
> myself.
>
> All it does is hold the bit in place for sharpening it, no high
torque as in
> milling, drilling, etc. I'd appreciate any suggestions as to
material to
> use, how to cut the 3 thin slots on the face that allow it to
tighten, etc.
> BTW my eq is all manual, even though the CAD CAM group is included
in the
> list. I get good info from all the lists!
>
> Thanks
>
> Lew


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