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Answer :
The first step to cutting internal threads on an engine lathe is to make calculations so that the thread will have proper dimensions.
What is lathe threading?
The technique of thread cutting on the lathe results in a helical ridge with a consistent section on the workpiece.
To work from a datum, often the center of your work on a lathe, zero off your workpiece. Use a drill to create a hole that is less in diameter than the thread, then switch to a threaded tap and carry on.
One would advise making sure your tool is adjusted to the appropriate height, that it is lined up where you want to cut, and that you have determined the speed you must cut in order to be safe. Before you tap, drill a hole.
With a CNC lathe, you can simply program the machine to perform the processes and tool changes for you.
Therefore, to do this, make a series of cuts with a threading toolkit that matches the needed thread form.
To learn more about lathe threading, refer to the link:
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Answer:
zero off your workpiece so you can work from a datum, usually the centre of your work on a lathe. change your tool to a drill and drill a hole to a size smaller than your thread diameter, change out your tool for a threaded tap and away you go.
I'm not sure which part they want but I'd say ensure your tool is set to the right height, you have the tool lines up where you want to cut and that you have calculated the speed you need to cut at safety. Drill a hole before you tap though.
If you have a CNC lathe you just set the programme to do the processes and tool change for you.
