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General Mach Discussion / Mach3 turn threading problem with Z feedrate
« on: February 04, 2020, 04:02:57 AM »
Hello everyone, I have a CNC converted lathe, everithing running fine with Mach3 turn from a few moths.
I need to thread now, and I have a problem, I can not understand why the Z axis movement starts with a different feedrate, and then stabilizes at the correct feedrate after a few millimeters. Everithing else is correct, if I change the RPM, the feedrate changes accordingly, but I can't figure out why at the start is different...
I attach a link to a little video of the problem. In this video I slow down the feedrate to make it easy to you to see what is the problem. You can hear the motor changing 2 times feedrate before going to the correct one.
It is the same with G76 or G32. I also tried to make some G1 passes in G95, and the feedrate is correct, but not in G32 or G76.
I think I have tried changing every settings in Mach3 with no luck. I hope there is something here that can help me.
Thank you very much.
https://drive.google.com/open?id=1_NKYLJ-pcKyUJI7g80QR5-i9lU1dOFSB
I need to thread now, and I have a problem, I can not understand why the Z axis movement starts with a different feedrate, and then stabilizes at the correct feedrate after a few millimeters. Everithing else is correct, if I change the RPM, the feedrate changes accordingly, but I can't figure out why at the start is different...
I attach a link to a little video of the problem. In this video I slow down the feedrate to make it easy to you to see what is the problem. You can hear the motor changing 2 times feedrate before going to the correct one.
It is the same with G76 or G32. I also tried to make some G1 passes in G95, and the feedrate is correct, but not in G32 or G76.
I think I have tried changing every settings in Mach3 with no luck. I hope there is something here that can help me.
Thank you very much.
https://drive.google.com/open?id=1_NKYLJ-pcKyUJI7g80QR5-i9lU1dOFSB