to add to my previous comments, the picture shows the result of me trying to mill a large pocket. Over the distance I am loosing steps so it isnt making it all the way to the end of the planned cut(starting x position)
If I run with the tool above the spoil board, the machine bounces and vibrates along the x axis. I start every operation by manually squaring the machine by using pre cut spacers between the rollers and the corner posts. After a long cut the rollers are no longer equal distant from the corner blocks.