Here we go again . . . MK4

[routercnc]

Thanks Paulus,

All thoughts are welcome. I did wonder if it might move the part but after it was cut out I grabbed it and tried to pull it around on the spoil board but couldn't move it at all. It was pretty solid.
I've cut lots of parts out using this spoilboard method and not seen this result before.
Also before I started the profile cut out I marked around the perimeter with a pen, and the part had not moved relative to this outline.
For the bores I was also only taking 0.02 mm cuts which is very little tool pressure, just taking whispers of metal off, and yet it still seemed to be progressing in the -Y direction by a small fraction each time.

So at the moment I'm assuming this is a new electrical or mechanical problem that has developed. I've put this poor little machine through quite a workout considering it was meant for plywood and balsa wood, so anything is possible. Maybe it has finally figured out it is making it's successor . . .

I also thought about whether I was missing steps on change of direction, maybe somehow the step active high/low setting had changed? Next chance I get in the workshop I'll check that and I'll run some G-code moving the Y axis back and forth various distances and at various feedrates (without load), stopping back against a DTI, and see what happens. Then I'll take it from there, repeating with the spindle on (no load), then some edge cuts, etc. and see if it returns to DTI zero.