Hoping one of the machine experts can point me in the right direction or at least suggest where to start looking, not sure if I should have put this in the hardware section or not??
So spent most of this moring cutting a large file, hadn't planned on leaving the workshop but best laid plans... So as I wasn't sure how long I was going to be away rather than just pause the job (which I now wish I had done) I made a note of the line number & then shut the machine down.
On my return the machine went back on & was homed. Gcode was loaded & cutting was resumed from where I had left off, you can see from the photo that there is a huge cliff where the machine started up again, not measured it but has to be at least 0.1mm, maybe a little more. the work offset is the bottom left corner & the machine was cutting the finish pass starting from the top right hand corner working back towards the machine starting position, the step is in the downwards direction.
I doubt this is any kind of wood movement, we don't really get many problems with humidity changes up here in Scotland.