I haven't had to confront the metric issue just yet, but I can see it
coming if I live long enough.
Every now and then HSM magazine publishes an article on lathe gear
ratios. Might be worth looking there. I vaguely remember such an
article within the last few years where the author developed a set of
tables of threads using standard gears that were so close to metric
equivalents that he suggested using them instead. Not all metric
threads worked out this way, but many did.

I always figured that if I had the need, I'd start out by putting all my
facts into a spreadsheet and go from there.

Why not ask this same question again on this newsgroup as a new post,
so it doesn't get lost in this one?

I've heard the 127 tooth thing, too. It must work. I just went out in
the shop to see what the biggest gear I have is. It is 96 teeth. A
127 tooth gear would be pretty dang big!

Pete Stanaitis
-------------------------------------------------

Brent wrote:
snip
Pete

Although i own a QC atlas i live in a semi metric land.

i KNOW in theory the way to convert the gear train is by using a 127
toothed gear because 127:50 is 2.54:1

i almost think i would have had an easier time doing this work on a
change gear atlas

Any ideas other than to ask this on the Yahoo group?

thanks for any guidance you might be able to offer