Collet, free for postage.

[Mr_CNC_guy]

I have this odd collet that I don't know what it goes to.
It is a 3/8" collet with a .5" diameter and about 2" long and 24 TPI thread.
It probably goes to some watchmakers lathe.
Rather than tossing it out, anyone can have it for postage.



This reading is ~0.5"

 

[Steve Marquess]

I have this odd collet that I don't know what it goes to.
It is a 3/8" collet with a .5" diameter and about 2" long and 24 TPI thread.
It probably goes to some watchmakers lathe.
Rather than tossing it out, anyone can have it for postage.

I'll bite (did I actually get to one of these first!?!). Will PM.

-Steve M.

 

[Mr_CNC_guy]

I'll bite (did I actually get to one of these first!?!). Will PM.

-Steve M.

You got it! Please tell me, what kind of collet it it?
Is it some standard size?

 

[Steve Marquess]

You got it! Please tell me, what kind of collet it it?
Is it some standard size?

No idea if it's a common standard, but it will fit my Black Diamond drill grinder.

-Steve M.

 

[Steve Marquess]

You got it! Please tell me, what kind of collet it it?
Is it some standard size?

Ah ... belatedly thought to check my notes from years ago. Looks like it's a Hardinge 3C (smaller version of the more well known 5C).

-Steve M.

 

[Mr_CNC_guy]

I don't think that it is a 3C, the diameter is wrong: this is 0.5" and 3C is 0.65".
A Black Diamond drill grinder collet is a good bet since no one seems to
know the standard that Black Diamond collets conform to.

 

[Big B]

It also looks like a 4ns collet.

 

[jim rozen]

3C is 26 tpi, so not that, right.
Either 4NS, or 3AT for an atlas.

 

[L Vanice]

Hardinge lists the Black Diamond master collets as "3/4 Black Diamond Round Collet" or the other two sizes, 9/16 and 3/8. In other words, these collets are unique to Black Diamond. As noted in post #1, the 3/8 collet has a .500 body, so it is obviously not one of the above mentioned collets that hold 1/2" or larger stock (3C, 3AT or 4NS).

3/8 BLACK DIAMOND COL 3/8 RD

Hardinge is the largest manufacturer of special collets in the world. We manufacture workholding products to suit many specific applications that are not the usual "off-the-shelf" type. Give us a call for more information on these types of collets listed here.

shop.hardinge.com

Larry

 

[Mr_CNC_guy]

Steve Marquess says that it will fit his Black Diamond, so that is likely the standard.​

It is in the mail to him, so we should soon know for sure.

 

[Steve Marquess]

Steve Marquess says that it will fit his Black Diamond, so that is likely the standard.​

It is in the mail to him, so we should soon know for sure.

Yup ... the notes I was looking at are years old. Dunno where I got 3C from back then. Actual measurement of one of my Black Diamond chucks (and my one collet) is 0.375" ID, 0.500" OD, 2.020 OAL, 24TPI thread.

The threadless Black Diamond drill collets (also proprietary) have a 3/8" OD and fit in this master collet. The ID is drill specific.

-Steve M.

 

[eKretz]

Yeah we've been over this before in quite a few different threads. The larger (3/4") ones are not C collets or any other standard I've found; the smaller ones are NOT 3C - although it seems there are many who will sit and argue with ya' about that.

Black Diamond Drill Grinder Collets

I bought a Black Diamond Drill Grinder and need to find a master collet for it. It is a # 3 and I have some bushings and a 9/16" master collet, but need the 3/4" size. What name do these collets go by? Van Norman uses the 5V to name their collets. Better yet does anyone have a spare 3/4" master...

www.practicalmachinist.com

 

[L Vanice]

Actual dimensions on the Black Diamond master collets are hard to find, and they are not even mentioned in my old printed Hardinge collet catalogs. The title of this thread does not mention Black Diamond, so I cross-posted to an old thread with a useful title in case someone looks for this information in the future.

Master Collet for Black Diamond Tool Grinder

I just bought a Black Diamond Drill Grinder. It works, but with a little work I think it'll be working in near "as new" functional shape. It even came with the web thinning attachment. It came with over a hundred small, 9/16" diameter collets covering letter, number (1-60) and fractional (1/16...

www.practicalmachinist.com

Larry

 

[OlCat]

Certainly not a 4NS. Diameter of.875 and 20 tpi . I don’t remember the length off hand, but close to 4”.
Bob