5C collet internal thread

[David ColwillParticipant @davidcolwill19261]

The other day I needed to do a job that would involve a 5C collet with a stop.

Sadly my 5/16 collet did not have the internal thread for the stop to screw in. I do own the type that expands into a plain bore but don't like it.

I thought that I would have a go at threading the collet (a genuine Hardinge) but didn't think I would stand much chance.

I used a generic 60 degree 16ER type insert.

It was in the end very easy.

David.

[David ColwillParticipant @davidcolwill19261]

Cut it yourself!

[BazParticipant @baz89810]

Strange that some collets are internally threaded and some not, when I was working we had dozens of genuine Hardinge 5C collets, some were threaded, I assume there was an option when ordering them, threaded or not. I also don’t like the expanding type, they tend to slip, the screw in ones however are excellent, especially as extension tubes are available so long jobs can be accommodated.

[Ian PParticipant @ianp]

David, how did you hold the collet?

Ian P

[David ColwillParticipant @davidcolwill19261]

Posted by Ian P on 19/08/2021 15:38:00:

David, how did you hold the collet?

The collet in question was 24mm.

I turned a piece of bar to 24mm and then tightened a 5C collet block on to it.

It looked rather Heath Robinson but worked very well.

David.

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