Leadscrew Freeplay

[JerrySharrett]

Jay,

I think you have likely figger'd this out, but I doubt that one thou in lead screw play is causing your threading issues. I'd be inclined to look at such things as tool rigidity, gib tightness, the compound being cranked towards the work or locked down, etc.

Justin

Probably 90% of thread finish issues is threading tool geometry.



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[brickeyee]

Jay,

If I'm understanding you correctly, you have an indicator touching the end of your lead screw, and you get .001 when you push the lead screw from side to side, meaning moving it parallel with the bed of the lathe. Correct?

Justin

Threads are normally only cut in ONE direction.
It does not matter as long as the lead screw comes to the same position when you start cutting each time.

It will only affect the very first part of the thread cut as the lead screw moves.

Far easier to remove the first half thread than try to make it perfect.