I'm simulating that now. I will let you know tomorrow. But your model has solved a problem I have had for several weeks. The key was the cylindrical coordinate system.nIn your original model, your end time was 0.0005 s for 1 revolution. That is 120,000 rpm. What lathe turning handbook has spindle speeds that high? I still don't believe the 5 mm you set to travel in that time. That is a velocity of 10 m/s. You won't find numbers like that in any metal cutting handbook that I know of.n