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Promote and discuss your product / Re: Step-Direction Servo PID Closer - Pixi revival
« on: September 23, 2016, 06:05:42 PM »Old machines with original motors generally don't have high resolution encoders, so it's not really an issue.
Not sure that's really accurate. Most encoders on AC/brushless motors I find are more than accurate (4k+ edge counts/rev).
Just type "AC servo drive" into ebay. Lots and lots of surplus AC drives and machines exist. There are huge quantities of AC motor drives mostly unusable by communities like this one for the lack of analog control. Using surplus AC servo drives would would be the least expensive way, by far, to upgrade to servo drives from steppers. with a huge increase in performance. Vast quantities of high power drives and servos can be had for cheap because the cost barrier to making them work is out of reach for most DIY CNC enthusiast.