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(GTO69RA4) wrote in message ...

The spindle drives one of two reverse tumbler gears which
in turn drive the tranny input gear. The tranny output gear is at the hub of a
banjo and drives the sliding gear. That drives the leadscrew gear. It appears
that the output gear (32 tpi) is "DR." The way I got it looks like it's was
last used for 20/40 tpi. I'm still a little confused as to the "use 16 gear to
compound" statement. Maybe what Lennie said about doubling the tpi as the
driver gear.

Bingo. As in, with the 32 tooth gear on, and everything else set for
20 TPI, putting the 16 tooth on would reduce the feed rate to 40 TPI.
Sounds like maybe an attempt to come up with a "sorta" quick change
box without ****ing someone elses patent lawyers off. I'd have to
look at the chart again, but it's possible that it's set so for any
given range of threading, one gear would give the three most common
multiples used in that range.

One thing that makes the old machines so interesting, for any given
function, there must have been at least 100 different ways to do it,
and all of them have been patented and marketed, the designers
convinced that their way was "unique and genius". They all boiled
down to the same thing, keeping a given ratio between turns of the
spindle to turns of the lead screw. Beyond that, it's all just
avoiding stepping on someone elses toes.

The amazing thing is the amount of tooling you got with it. Not usual
to see something this complete. Especially as a freebie. (Well, what
you didn't pay in money, you'll pay in labor.)

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