I would like some help on how to cut Type A wood screw threads on a lathe. I want to cut them on 3/8 hot roll rod. I know they are comercially cut with a threading head. I was told the threading dies would cost $5,000 for this particular thread type. If these threads can be cut with a single point tooling. My first question is do I cut the taper first then cut the threads. Or do I cut the threads with a taper attachment and multiple passes. The lagg screws look as if a acme type tool bit is being used. They look to be 5-6 threads per inch pitch. The Machinest Handbook was not much help. I want the threaded portion of the rod to be about 2 inches in length. I believe hot roll will work best because it will be less brittle. Your ideas and recomendations are welcomed.