Response top posted:
Hi Bob
If you can get your hands on a copy of the Home Shop Machinist,
May/June 2000, page 38, Peter Lott has a four page article called "
the Lathe Thread-Chasing Dial- - - Lathes with Inch-Thread Screws".
He goes into the whys, hows and wherefores of the threading dials and
how he made one for his 12" Seneca Falls Star lathe. Lots of good
info including how he calculated the drive gear. Also a 'Thread
Chasing Dial Table' for use with even and odd thread lead screws.
Best of luck
Bob

On Sun, 07 Aug 2005 15:31:37 -0400, Bob Engelhardt
wrote:

I am going to make a threading dial for my Jet 1024. It seems pretty
straight forward, but I want to do a sanity check and ask a couple of
questions.

1. My Logan 200 and the Jet have the same lead screw (8 tpi). I assume
that this means I should use a 16 tooth dial gear, as that is what the
Logan has.

2. The lead screw looks like an Acme thread, could it be something
else? If so, how would I figure out what it is?

3. What is this kind of gear called? I.e., when I call Boston Gear,
what should I say I need? Is "To fit an 8 tpi Acme thread sufficient"?

Thanks,
Bob

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