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http://www.readresearch.co.uk/personal/mycncuk/x_tuning.png

http://www.readresearch.co.uk/personal/mycncuk/y_tuning.png

http://www.readresearch.co.uk/personal/mycncuk/z_tuning.png

Also, in...

Hi Clem,

You haven't mentioned the material you are cutting. You mention 'mill a hole of . . .' so is this aluminium? If so that could be your problem right there - I don't think the 3020...

Are the errors the same in x and y on any given piece? Are you cutting a piece out of a larger piece, or just trimming edges? Missed steps would be a classic problem but would tend to give undersize...

I'll post up my settings later, they are a bit different from what was in the instructions files. TBH I don't fully trust the instructions. Maybe you are losing steps due to bad settings.