Forgive my ignorance, but I don't know the various Clarkson types.
I was fortunate to pick up second(?!)hand at one of BSMEE "bring and buy"
sales, a small Morse2 Clarkson collet chuck, with just one collet! I picked
up another collet at an ME show, and then made two more for myself! These
are the older pattern, that has two parts of the base cut away to form the
physical lock betwen the collet and its holder. They didn't prove difficult
to make, since they were bored in the Clarkson itself. I made several blanks
at the same time for future use. The only slight problem was the 20 tpi
Whitworth TYPE thread inside, as this is a constant pitch regardless of
diameter. At the time, I hadn't a suitable tap -( rare), and neither a small
enough internal thread-cutting lathe tool. It was solved by using a UNC tap
instead, which DID have the right pitch, even if not the right thread form!
Its only a small mismatch to a Whit one! (Normal home tolerances
prevailing!)
This old type of Clarkson collet does still turn up in ME-type shows, but
increasingly expensive, even though secondhand. The later ones with only
half the base cut away as used in some of the far-eastern chucks are more
common, .
Dave.
Hi
If you are in or near the Halifax area try RD Barrat small tools. I use
them for quite a few secondhand tools. I dare say they would post them to
you. Excellent value for money.
I am not part of or associated with Barrats nor on this occasion am I
cynically trading.
Cheers
Dave
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