As far as controllers go, I believe Centroid Acorn will still display DRO whether you have servos or steppers. I plan to retrofit my BP Series 1 using DMM servos as well as the Centroid controller. First I need to purchase and install Hiwinn ball screws then go from there. Do a google search for "Centroid Acorn". Centroid has a good page explaining Acorn's capabilities.
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