I have a router that came with a cheap Chinese CNC controller. I have replaced it with Mach 4 and DSPMC controller. Router has Yaskawa drive SGDV-7R6A01A. One motor is setup as Master the other is slave. The issue that has come up Gin is that the slave does not always follow the master and a times will jump in mechanical position 3-10mm over time the bridge will twist out of square 3-4mm over the distance of the Y axis.
This is most evident when running a job using G54 and then at the end switching to G90 move, where you see one axis jump with the other motionless. I have successfully done electronic gearing of servos on other equipment but not on a CNC of this type. Any suggestions would be helpful.