Sounds like you don't need it to do more than rest without going
off centre at the tailstock.? Why not build up from a live centre?
- viz.? centre drill a piece of stock to be a comfortable fit over
the live centre, and machine the other end of the piece to hold
the workpiece using whatever is appropriate for the workpiece,
e.g. drill it for the shaft and hold it in place with a locking
screw.?
Or simply make the stock threaded M12 to hold the Jacobs chuck.?
In other words the piece is nothing more than a short M12 studding
with a well formed conical centre hole at the tailstock end and
enough protruding from the chuck (say 10mm) to be able to extract
it afterwards from the rear of the chuck.
Live centre plus that odd 10mm plus the chuck itself does take
away a fair amount of your space between centres, but that would
be true with almost any solution.
regards
Mehmood
On 15/11/2021 15:59, David via
groups.io wrote:
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Carl and Dick,
Thank you for taking the time to read and reply to my post.
When working on old longcase clocks I sometimes find myself trying
to fit a 150mm long shaft into the lathe for attention.
They can be anywhere from 1 to 7mm in diameter and have various
step changes in diameter, plus a gear cog at one end and a larger
gear wheel at the other.
They don't always fit back through the chuck, so it can be
difficult to provide enough support for them.
I would like to be able to mount the tailstock end in a
free-turning Jacobs chuck to give more stability and options.
kindest regards,
David
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