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Collets in Super 7 tailstock

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JohnHaine:
When I say grip I mean between the tailstock barrel and the taper!  Too often I find that large drills dig in slightly then the arbor starts rotating in the barrel.  Thai is partly because the arbor supplied with the large keyless chuck I have is not quite the right taper.  But given I have mt2 collets it is a shame the only place I can't use then is in the tailstock.

Though the od of the barrel is slightly less than 1.125, it's still larger than the crest diameter of the Myford spindle nose thread so it should be possible to cut a thread.  You don't need the usual 1.125 register for a collet closer.

JohnHaine:
Just to get back on topic, what I am asking really is:

Has anyone cut a thread on the end of a Myford Super 7 tailstock barrel to allow them to fit the Myford collet closer to clamp a myford collet?

I know that the diameter is OK, the main concern is if the steel is machinable.  I don't want to start and find that it's too hard and make a mess.

Meldonmech:
Hi John

                      Try filing the barrel with a fine cut file, generally if you can file it you can thread it.

                                                                                       Cheers David

JohnHaine:
OK, thanks David.  I tried a file and it seemed OK, so I will give it a try.  Will have a trial run on some scrap stock first I think!  If it works I'll post some photos (if it doesn't I'll keep very quiet!).

Cheers,

John.

racer-john:
   
JohnHaine
 You're being very quiet!

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