John Thornton wrote: > I've cut the same threads at rpm's from 100 to 2000 (by accident) and > the pitch is perfect. I've seen a video where a guy was turning his > spindle by hand back and forth and EMC was keeping perfect pitch, iirc > the guy was positioning the stock for a recut of the threads. > One thing that is important is that the trajectory planner needs to be running at the full servo period, not at some submultiple. So, in the .ini file, the SERVO_PERIOD and TRAJ_PERIOD should be set to the same value. If the TRAJ_PERIOD is set to a larger value, it will cause a significant time lag that causes the Z axis to lag behind. When reversing, this lag becomes doubled as a position error.
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