Progress on doing a custom Grizzly G1005 CNC conversion is going well. I am going to be using Nema 34 servos of some kind. . I have access to quite a few AC brushless servos with controllers for cheap prices. These servos come from multi-million dollar pieces of optical test equipment and are superior to most any servos on ebay or anywhere else. Trouble is, all the controllers take standard analog servo inputs. I can't use Rutex or Gecko drivers since the servos are AC and brushless. Is there any cheap way to convert step direction signals from parallel ports to a standard analog servo input?