I would not waste time on that machine. Sorry to put it so bluntly but there are so many cnc knee mills available, with working or dead controls that you can get really cheap. I bought 2 mills off ebay for around $750 each and 1 has a 4th axis rotary table. Both machines are in perfect mechanical condition just electronics need a retro. Buying a good set of ball screws for your mill will probably be at $1000.