Originally Posted by
trajectory
Baz, sounds like as good a solution as any. Just for info I found a 50tpi Whitworth thread, well, two of them with 50tpi, one on 95 thou, other on 100 thou. They are or were in the range used for watches & instruments. Smallest was 400 tpi on 10 thou. That would be an interesting one to copy......
Cheers
0.25 of a mm, I wouldn't even be able to see it ! Seriously, John Knibbs must have the original dies as they supply these screws.
Baz
BE AN INDEPENDENT THINKER, DON'T FOLLOW THE CROWD