I developed a system to use on our routers that use mach. I only use 3 dots for overall stretch or shrink in the x and y. It also compensates for the rotation. The dots need to be within 1/2 inch of where they should be located but as long as they are that close it works very well.
Bill
Hi Bill
Is there any chance that you share your system? Also do you use a webcam to find the dots?
Thanks
Sacramento