Threadcutting in the lathe – help please!

[ManofkentParticipant @manofkent]

Good points all.

This has been incredibly useful – thanks to everyone.

I was thinking about screwcutting boiler fittings because i like the challenge of learning something new, and I want to master this CNC lathe.

Looking around the web I can find general inserts for whitworth threads, but the specific ones for each pitch need a bigger toolholder. I may just make the toolholder – this would be a fun thing to do on my edm machine. (Another curiosity purchase of mine).

When I can screwcut like Andrew i will be more than happy .

Ps ML10 Lathe is a metric one which limits the imperial threads I can cut .

John

[HopperParticipant @hopper]

With a CNC lathe and EDM you will be able to make just about anything!

When you get Martin Cleeve's book on Screwcutting in the Lathe, he includes charts for using the standard changewheels on a metric lathe to cut imperial threads, via the miracle of compound gearing. I use his opposite chart to cut metric threads on my imperial lathe with the standard imperial change gears. Accuracy is within one thou in three inches to eight inches — plenty close enough for home shop work, and probably more precise than the original lead screw.

[Author]

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