Good day. Please help me figure out the C-axis. There is no documentation for the machine. I describe the problem. I enter the command M90 (C-axis is active) I refer the C-axis to zero, everything is fine. With the M91 team, I switch to normal spindle operation, everything is spinning. I re-dial M90 C0 and the axis does not get into the correct position. shows C 000 but really no. It is necessary to manually re-reference the C-axis. Then the C-axis is at zero. I don’t know how to work with her?