4mt to 4c spindle adaptor

sisabdulax · Jun 18, 2015

Hey all,

Looking for a 4MT-4C collet, anyone know of a source or got one laying around ya might part with?

Thanks,
Mike

peterh5322 · Jun 18, 2015

The usual approach is to take an un-hardened adapter of the appropriate MT and machine it in-house to suit a C collet of the same number.

That is:

5 MT spindle to smaller MT adapter --> 5C collet adapter

4 MT spindle to smaller MT adapter --> 4C collet adapter

3 MT spindle to smaller MT adapter --> 3C collet adapter

billzweig · Jun 18, 2015

4C collet diameter is almost the same as the small diameter of Morse Taper 4. I do not think there is a commercially avertible adapter. You could try and bore a blank MT4 to accept the 4C, though I cannot see how this is going to work with a draw bar - unless you make a front collet closing nut. You can get soft MT4 blanks:

Tool Holders, Mill Holders, Collets: Collis Toolholder Iowa

I am not sure, however, if it is practical to peruse this.

sisabdulax · Jun 19, 2015

I was hoping to be able to find one, but knew kinda obsolete. If I gotta make one so be it. Thanks for the info guys.

Mike

johnoder · Jun 19, 2015

Not that its obsolete, just impractical. 4C thread dia of .945 and small end dia of MT4 of 1.020 does a good job of eliminating the possibility of a draw bar/draw tube.

sisabdulax said:
I was hoping to be able to find one, but knew kinda obsolete. If I gotta make one so be it. Thanks for the info guys.

Mike

sisabdulax · Jun 21, 2015

but when your headstock is 1.062" it becomes practical. and I have a source for the collets.

TToolm · Jun 22, 2015

You might try PLAZA MACHINERY,USED MACHINERY, METALWORKING MACHINERY, WOODWORKING MACHINERY

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