Hi Dean
I could do with a bit help now you are asking lol.
I have just started experimenting with 3d parts and designs but when i start cut after setting my x y and z ok, the cut on the z axis starts to get deeper when job is running.My bed is flat and level just to check but when I stop program running and check my Z axis it is way out and when i zero it again and start job again, over time the same thing happens.

Billy