In article ,
GTO69RA4 wrote:
Thanks, that straightens things out. I've looked at the parts and the geartrain
seems fairly simple. 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.

Perhaps -- or it is a second gear in a stack to change the
ratios in whatever way.

Sorting through the bucket 'o gears that came with this thing will be
interesting. Lots of possibilities not listed in the chart. Must be 100 in the
bucket.

Do they all have the same hub? There should be some kind of key
on the gears, so two can be locked together on a keyed bushing for speed
changes, and so they can go on the end of the leadscrew as well.

If you happen to have a 100 tooth and a 127 tooth in the
collection, you can probably even set up to cut metric threads, though
the threading gauge will be useless for that -- you'll have to leave the
half nuts engaged and reverse to get to position to cut the next pass.

Looks like I'll have to weld up a replacement tooth for the pulley bull gear,
too.

That -- and cut or file it to proper shape.

Good Luck,
DoN.

--
Email: | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---