HH

Here are a few photos to illustrate the testing I described. I used some of my 80/20 to make a mock up of a CNC.



Step 1. This roughly where I mounted the indicator. I zeroed it off the top of the gantry.






Step 2. Here, the mock up shows the gantry lowered by the G91 distance.






Step 3. This photo shows the gantry raised by the same G91 distance as it was lowered in Step 2.




Step 4. Note the reading in Step 3. In this example, I mocked up a reading of -.1035, which would indicate that the screw was slipping, or the stepper was losing steps.

Repeat a total of 10 times.

Here is the other suggestion was to mount the indicator to Z and zero it to the spoilboard. After zeroing it, it's the same steps as above, only your first move is up, and the second is back down.

Does this make what I described a little clearer? I hope so.

Gary