Hmm ... only a #7, and for bevel gears (ones whose teeth form a
cone instead of a cylinder). Very coarse pitch, so unlikely to
be needed for anything which fits in your (or my) shops. :-) And
the only thing you can do is make a pair of identical gears for
probably a right angle pair. (I'm not sure what the numbering
means in the bevel gear cutters.)
I shuffled these a bit the 5P bevel belong in a separate bunch from
the normal cutters above. Still a rather coarse pitch for home
machines, and about half a full set. Note that a No. 1 is for
135 teeth to a rack gear.
Again -- a rather coarse one, and only one for the bevel set.
Again -- half a set. They didn't seem to like rack gears, or
many of the middle tooth counts.
O.K. You could make a rather coarse set which fit at a right
angle while changing speeds.
Again -- (less than) a half set -- this time focusing towards
the smaller tooth counts.
O.K. you could make a pair of gears for 3:1 or 4:1 ratios using
these. Still a bit large.
O.K. This set is getting into a reasonable size range for a
large lathe. I would guess a 16" swing or so -- and is missing
only No. 1 and No 8. With the No. 1 you could make a rack and
pinion for feeding the carriage -- and I haven't checked the
pitch of those on my 12" Clausing. Looking at the drawings in
the manual, I would guess that it is the same pitch as the gears
in the headstock. But if you need a big rack and pinion you
would want these -- but with a No. 1 -- and if you need fewer
than 14 teeth on the pinion, you would want the No. 8, or
perhaps need a real gear hobber for even fewer teeth.
Another reasonable partial set -- . The 'D' seem to be clues as
to how deep to cut from the OD of the gear to complete the tooth
depth. It looks as though they made a lot of the 12 DP gears in
the 35 to 54 tooth range, and in the 26-34 tooth range as well.
I suspect that you'll find most of them are rather dull by now
-- and they bought replacements to continue production as each
Now -- we skip over the size which would be most useful for me
the 16 DP 14-1/2 degree PA. I noticed no markings for PA (Pressure
Angle) in your list at all. There should be a marking, perhaps on the
other side of the cutters.
Perhaps reasonable for a 9" or 10" lathe? But only for the
smallest tooth count since it is a No. 8.
And a single middle-of-the-road one for a rather small gear with
a 24 DP.
Now -- these two are at least intersting. Two different roller
chain sizes and I think that both are larger roller chains than those
commonly used for bicycles. The 5/16 size is pretty close -- I think
that bikes are 1/4" roller chains. The 9/16" might be for a fairly
hefty motorcycle chain.
If you want to experiment with cutting gears, I would suggest
that you go with the 24 DP one -- or if you want to cut fewer teeth in
your trial -- go to the 18 DP one. A 12 tooth gear should not be too
difficult to cut on a rotary table without disk and arms -- you stop
every 30 degrees. With the 24 DP one, you would aim for a 36 tooth
gear, so you would stop ever ten degrees. Neither would be too bad to
deal with. To test your gears, you should probably make two of the same
pitch and check how they mesh -- and whether the centers are the proper
Overall -- most of what you have are too big to likely be useful
for your existing machines, and probably too big to cut with the right
angle head without the outboard arbor support as well.
I would be careful with the 4 pitch one even on my Nichols
Horizontal mill -- except perhaps an an Aluminum blank.
Go to _Machinery's Handbook_ to find formulas for calculating
the starting diameter for a given tooth count for a given pitch.
It looks as though the most useful DP range has been taken out
before the lot was sold.
I would suggest that you check with eBay for disposing of your
coarser ones. Maybe keep the 8 DP on down (in size) to the 24 DP. But
if you settle on a given DP (and PA) get the other gear cutters to fill
out the set. And I don't think that the bevel gear cutters will be much
use to your -- there aren't enough of them to really do much.
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
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