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john j · Joined: 15 Nov 2006 Posts: 1

If I have a threadded shaft that needs the threads cleaned up by re-tracing the threads on a lathe, what is the best method of realigning the part to the threading tool? Threads are standard 60 degree Vee type, 28 threads per inch.

Don't know if it matters, but I have a Smithy CZ-239 lathe.

Thanks

dougsgh · Joined: 29 Apr 2005 Posts: 2

With your job set up in the lathe, correct pitch setting, and 60 degree thread cutter, set the toll post cross slide to be parrallel with the job.

move the cutter close to the job, and engage the feed, now adjust the other cross slide so that the cutter lines up with the threads.

start the lathe up keeping feed engaged all the time, double check that the cutter is running in the correct place and your pitch is the same as your old thread.

Commence cutting as per normal!