I am in the process of finishing up a retrofit of a 1998 bridgeport 1000 vmc. I replaced the stock servos and drivers with dmm servos and drivers. Its controlled by centroid acorn board. Ive got everything working on it and I cannot seem to figure out how to get the surface finish of my aluminum parts to have a smooth finish along the y axis travel. Doing a simple square box profile cut shows slight tool marks along the y axis of the part. I originally thought it was a tuning issue with the servo but I've tuned a made test cuts and no tuning seems to make it better or worse. I dont know if it's a ballscrew issues or the end bearings going out. The table on the machine is pretty heavy and I really can't get any noticeable play in anything. The video below will show an indicator on the end of the y ballscrew as its doing the test cut. Then I show the y axis of the part and then the x axis. The y axis definitely has something going on with it but I need some help determining where to start looking.
Thanks
https://youtu.be/dyJ_mmkPF70