R8 to 32mm cutters

[Bob AstillParticipant @bobastill76884]

Bridgeport R8

[Bob AstillParticipant @bobastill76884]

Hi all i have a Bridgeport miller with R8 fitting i have been given a lot of brand new cutters they all have a 32mm shank with a thread on my large Clarkson chuck only goes to 25mm. i have searched the net for an adapter but i am not sure i am looking with the correct phrasing keeps coming up ER32 but this only goes to 25mm i did find something similar but it was for tools with a flat on the side of them. Can someone please tell me what i need to get and from where or what to search for? Many thanks.

[Neil WyattModerator @neilwyatt]

Are you sure it isn't 1.250" shank?

http://www.ebay.ie/itm/1-25-LARGE-CLARKSON-AUTOLOCK-COLLET-Length-2-/151164708587

Neil

[JasonBModerator @jasonb]

Clarkson also do 32mm metric collets but like Neils link more often seen on INT tooling than R8

You could grind a flat on teh side and use a R8 Weldon type holder, more of those about

Edited By JasonB on 11/08/2016 19:00:36

[Bob AstillParticipant @bobastill76884]

I am almost sure It says 32mm on the side i will check tomorrow the hole in the end of my large Clarkson chuck is 1" so it would need a bigger collet holder if i can find one.

[Anonymous]

Posted by Neil Wyatt on 11/08/2016 18:52:36:

Are you sure it isn't 1.250" shank?

Could be either, 32mm is a standard size for Clarkson style threaded shank cutters:

My SKF/Dormer Clarkson clone chuck has both 1.25" and 32mm collets; however it's on an INT40 spindle taper. I don't know whether the larger chucks can be obtained for R8 spindles. Personally I wouldn't bother; the Bridgeport doesn't really have the rigidity or horsepower to make proper use of this type of cutter.

Andrew

[Bob AstillParticipant @bobastill76884]

Hi thanks for all the replys I got a holder with 2 grub screws that clamp the side of the cutter its not ideal but it does the job i just ground 2 flats on the cutters when needed.

Bob

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