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Home Workshop > Members > Forum > General Area > General > Threading inserts?

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Threading inserts?

Re: Threading inserts?

Will have reverse this week hopefully.  If its possible to cut metric threads on an imperial lathe and disengaging lead screw thats the way I would like to go if possible.  Guess I will just have to try it see if it works or not?

The method of marking the lead screw, saddle and chuck would probably work if cuttting imperial with imperial lead screw or metric with metric, but didnt work with imperial lead and  metric threads (without turning chuck by hand lots of turns to realign marks).

Flip up tool holder sounds a good idea and will certainly have a look at that as well..................

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Re: Threading inserts?

There's almost no easier method of cutting those threads (especially for the novice) than reversing the spindle. Why you would not want to do it is beyond me.

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Re: Threading inserts?

Main reason it would be nice to disengage lead screw is that it means a lot less chance of crashing tool into a shoulder. Anyway no harm in trying the method shown in the Ox-Tools video, if it works it works if not only wasted a short bit of plastic pipe...............

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Re: Threading inserts?

You can disengage at a shoulder for short threads. Stop the lathe, wind the carriage back all the time watching the threading dial then reverse the motor so that you pick up the exact same mark on the exact same rotation.

Or use a brake.

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Re: Threading inserts?

Thanks Pete. Would you say the method shown on this video would not work? https://www.youtube.com/watch?v=HXt4TWa382Q

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Re: Threading inserts?

Course not - it patently does. They are both variations on the same theme, the key thing is that you MUST run the motor backwards to pick up the same number on the dial on the same rotation.

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Re: Threading inserts?

Thanks Pete. Had arranged for electrician to come round today to look at sorting reverse on the motor, but  needless to say they didnt bother to turn up and didnt phone!

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Re: Threading inserts?

They are not usually that difficult. If you pop the cover off the motor contact box the wiring diagram is usually on the reverse.

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Re: Threading inserts?

Thanks, Pete. Took the cover off earlier and the 240v has been wired in badly and would be nice to sort out the lash up they have done. I guess it's a matter of identifying the start windings and wiring up a drum switch so the feed to these windings can be switched which will cause the motor to go in the other direction?

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