I need to open up a 5.4 mm collet to 6.3 mm in order to fit a Jacot tool attachment to the tailstock of my clockmakers lathe. Can anyone suggest how this might be done? Is it even possible?
Cliff Coggin Kent UK
8 mm WW collet enlargement
Jul 19, 2004
2 Replies
Hi Cliff,
Find some soft shim stock to fit in the slits in the collet, filling them fully but not leaving any sticking out on the tapered closing surface. Fit collect into it's taper and bore out to desired diameter. Remove the remains of the shim. and all should be well.
hth
Bob
Thanks Bob, but I shall have to give up on this. Not only is the collet hardened, but I have no way to fit it in the headstock. (The headstock takes
10 mm collets.) By the time I have softened the collet, and then made an adapter and drawbar, I might as well buy a collet of the right size. Shame, as this collet is a spare which I don't need.Cliff.
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