Screws for stock iron

[Olle]

Originally Posted by regul

Jerry
I compaired a original stock iron screw to the drawing of the screw (which is not a 1:1 scale drawing as to length) on page 1834 and it is accurate.
The best match for thread pitch I could find appears to be Whitworth (55 Degree) 30G.
Thanks
Ed Roane

Do you know what the thread pitch is? Diameters and tool angles are easily changed when making screws in the lathe, but it will take some math to come up with the correct change gear combination if it doesn't correspond to a common standard or metric pitch.