Quote Originally Posted by gomako View Post
I assumed that too, but it's usually going wrong right at the end of the job when the tool is being lifted right up out of the workpiece, moving slightly and then zooming back down again (when we are cutting in several passes - we still have to get our techniques right!) so it's when it moves a up and down a (relatively) long way in a short space of time that it goes a bit strange.

Thanks again!
Ahh ahh ok then you could well be overtuned or under powered on the Z axis like John said.

Either way if you have backed it off and it's working ok now then your sorted and happy days. . :)