Lathe-Cutting Screw Threads – Part 2, by Steve A.
(Continued from Part 1. This concludes the article.) Screw design must be considered. If the screw shank will go into a hole drilled to accept the nominal size of the threaded fastener then this diameter must be cut all the way to the screw head. If this is a fully custom application you can, of course, leave the shank any size you desire. In this case, the hole in the fixture was made to accept the existing blank screw shank diameter. The trick in all of this work is holding a relatively long, small diameter, and fragile part for threading …