With thread mills the same insert will work on both internal and external threads. and I have to physically change two gears when switching from Imperial to metric on my manual lathe not just switch some levers. ![]() Multiple passes are needed with the lathe. Cost is more than thread milling inserts as a full profile insert is needed for each internal and external pitch along with an assortment of anvils for differing helix angle of a particular thread. Right now to make these large threads, I set up on a manual lathe using the reverse helix method and full profile inserts. But I also have a need to tap blind large internal and external threads 3.25-16UN and M102-1 in 1/2" thick triangular shaped aluminum plate where thread milling should work great. This should directly transfer to the Tormach when it is delivered in March. ![]() For the small 4-40UN threads, I use a Balax forming tap with Procunier 1E tapping head on a manual mill. ![]() Most of the many thousands of holes I thread are blind 4-40UN. I agee, if all of your threading is small size, then tapping is more cost effective than thread milling.
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June 2023
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