Quote Originally Posted by JAZZCNC View Post
Don't know why it's doing this never seen it before but the reason it kept going after feed hold was because it was emptying the buffer.

Have you done a check to see if your missing steps from the pulse being on the wrong side of the edge.? If not then Zero the Z-axis and mark it's position then write some G-code so it moves back n forth several 100 times, only needs to be short moves. Make the last move go back to Zero.
If it doesn't return to the mark then you need to change the active Hi/Low in motor tuning for that Axis.

Thanks Dean, no I don’t think I ever did that test on the Z axis but I did on the other two. I’ll give it a go and see, but really wanted to finish this job!

I reduced the Velocity on z from 2.5m/min to 2m/min and the acceleration from 250 to 200 and ran the roughing pass again a little slower than before and it cut to the end without any trouble (although it is hard to tell if it lost any steps as it is only a roughing toolpath). But once it was done and had gone back to zero for the tool change it kept making little erratic movements again. Could this still be to do with buffering if it is stopped for a tool change? I videoed it for a few seconds this time, if you have the sound on you can here it making little jerky moves. This was at the tool change so no g-code to tell it to move and nothing changing on the DRO. I don’t get it?

https://youtu.be/m1vlkqPeVMM


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