Collet Compatability

[34_40]

Are 3 SB collets the same as 3C? What about 1 or 3 AT?

Are these really all the same ?

 

[brino]

That looks like a good question; it has 54 "views" right now, but no responses.
Let me check a couple old catalog and see if I can find anything.....I'll post back if I do.
-brino

 

[brino]

hey 34_40,

You might want to check-out this thread:
http://hobby-machinist.com/threads/is-there-a-definitive-article-on-collets.36227/

specifically:
-the Harding catalog in post #4
-the "Collets Measurements.pdf" file attached to post #18

Note: I am NOT saying they have the exact answer to your question, it is just where I currently am in investigating the answer......and I'm still looking!

Big thanks to user Uglydog for both of those!

-brino

 

[Bob Korves]

Are 3 SB collets the same as 3C? What about 1 or 3 AT?

Are these really all the same ?

3AT collets are definitely not the same as 3C collets. I recently sold some of each. At a quick glance they look the same, but they have different taper angles and slightly different drawbar thread sizes. They are not interchangeable. I am not familiar with 3 SB collets but it might be a South Bend proprietary name for 3C collets, not sure about that...

 

[brino]

okay,

3C and 3AT appear different from each other:
http://www.conradhoffman.com/Collet Adapters.PDF
http://www.travers.com/3at-3c-round-collets/p/94303/?lite=true

Strange, I have not been able to find dimensions for the 3SB collets.
My local used tool guy had a Southbend collet closer and collets last time I was in, if I get there again today, I'll take some measurements and pictures......

-brino

 

[projectnut]

The best resources for collet identification and specifications are older Machinery Handbooks. At least the 10th and 13th editions have a section dedicated to collets. I don't know if any newer or older editions contain the same information. I have a reprint of the first edition which does not have this information. Neither do my 22nd, 26th, or 27th editions.

 

[34_40]

And thanks for the help so far! I guess it was / is a good question as I saw the numbers of folks looking but, I guess I haven't found the right person with the answers (yet).
I'll have to look at themach. handbook my friend has too.

Thanks for all the replies! I'll keep searchin' for an answer.

 

[kd4gij]

You will need to find out what he has. Rivet used a 3sb collet but it is a very small jewelers lathe
This guy has what he says is a mix of 1a collets and 3sb


http://www.ebay.com/itm/MACHINIST-T...664986?hash=item27e110475a:g:ILMAAOxyjxlTMkwc

It appears South Bend used an array of collets over the years.

 

[David VanNorman]

3 C and 3 AT are different. That I know.

 

[34_40]

That ebay picture makes it look like the 3SB and 1A might be the same - if money were no object, I'd try to buy that setup and find out.. But, that won't happen! LOL...

Thanks for the info DV.