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My first go at metric threading has been a little frustrating. I have gone through all your responses and done my best to follow all the suggestions and advice and here is where I am at. -leadscrew thread pitch is confirmed to be 8TPI. -I cannot easily reverse the 91/86T gear orientation, there...

I did follow that process. Are you thinking the center gear stack needs to turned around? It doesn't specify that, but it would be easy enough to do and check. There would be some minor change (3 tooth difference) that may be just what's needed... Thanks for thinking of that. I have to go help a...

@PeterT I really appreciate the time your taking to walk through this with me. Here is the setup as I have it. I double checked, lever on the headstock is in the threading position and I have not disengaged the half nut lever since I started the process. I reversed the lathe out far enough to...

I can get the collet nut to thread on about 3-4 turns then it stops for obvious reasons

I just tried that. I'm getting 1.556mm now...

Yes, both are identical.

That was an AWESOME suggestion...went to my plumbing tool box and got a test piece

Yes, that is where I got the 1.46mm result

Sorry this is a bit scattered. I can only post pictures with my phone and its a paint to type with it. As per the manual, the center gear hub stays in place. outer gear is 91T inner gear is 86T top gear is a 45T and lower a 60T (its actually stamped 1.5mm) I placed the gear box levers in "B-6"...