I have a Servo cnc mill that I've retro-fitted with Geckos and new servo motors from Camtronics and Mach3. Originally, despite being named "Servo" it was closed loop, but with steppers with resolvers, etc. My impression (my firm owned three) is that they were all that way. Perhaps you should inquire if the electronics are as delivered. Typical new price for a ballscrew/big table version was north of $20,000 twenty years ago!
The ebay machine is really three axis and has the small table and ballscrews - that was an option. The headstock is not very rigid and is in stark contrast with the rest of the mill which is built like the proverbial brick ****house! I replaced the headstock with a high-speed Sherline unit with the ER collet spindle.
My machine, as modified, makes all other minimills look wimpy. This thing is all cast steel or iron with precision ground ways. It even has a manual oiling system. Holding less than +/- .001" is easy.
Hope this helps
Bill Box |