Threading with inserts

I can't decide if this is a tip, a question or just an observation.

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I have to do a fair amount of threading and often use the ER16 type inserts.

I have noticed that the threads can look quite rough and then suddenly as you get to correct depth magically get much better.

Has anyone else noticed this?

If they have do they know why?

I post this here as I have seen people complain that they don't get good results and wonder if this is why.

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I should point out that I don't use angled infeed on the manual lathe but do on the CNC.

I also it doesn't seem to be a depth of cut issue because when doing batch work I am going off the DRO and am able to finish the thread with 1 spring pass.

Any thoughts?

Regards.

David.

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