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thread dial for a minilathe.

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wheeltapper:
Hi
I have a small import lathe, it's a Chester Comet, its metric and I would like to make a thread dial for it.

the leadscrew is 2mm pitch.

what I need to know is what diameter gear and how many teeth do I need to mesh with the leadscrew.

thanks in advance for any input.
cheers
Roy.

Lew_Merrick_PE:
Hi Roy -- My 2mm pitch leadscrew is (Maj Dia) 15.95 mm and uses a 16T gear to drive the threading dial.  Does this help?

wheeltapper:
Hi
thanks Lew, that gives me a start.
I've been trawling the net and the more I read the more complicated it seems.
some say you need two different gears to cover the range.

lots to think about.

cheers
Roy.

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