George replied:
>There is one ideal way of doing this, and that is to make a plaster
>cast of the male threads on the remaining (?) quill (s) and then to find
>a Wade Bench Profiling Machine:

As much as I would love another machine, I do not see a profile machine on my
horizon.

If all else fails, I may use this as an opportunity to make a thread tracer for
the small lathe. Part of the difficulty is that the flank angle isn't the same
to either side, being about 50 degrees on one side and about 55 on the other,
for an included angle of about 75 degrees (again, not consistent from point to
point. Come on, Stanley. It is steel, not chewing gum). Given that the design is
post turn of the 20th century, I would guess that it is some reasonable nominal
pitch, even if it isn't a standard machine thread. It just comes in at less than
12TPI and greater than 11-1/2TPI on both braces, any position I measure, any
method (thread gauge, traveling microscope, over parallel wires, direct scale).
I even pulled out the oddball scales for comparison (true point and pica rule
among them. No clear match.

I no longer have access to a CMM (really? who besides me would think of using a
CMM for this?) though that would be the cats meow for this. Oh well.

Given the short timeframe I have if I want to make my demo useful, I may just go
with 12TPI and see how the pads hold up, but I would really like to make the
tool so it is useful to others, as I am likely to have a lifetime need of two
brace pads.
 *** This message was sent from a convenience email service, and the reply
address(es) may not match the originating address