Brian
Adolph, what a name for a CNC control!
Whats up with the original control? Just womdering whether it might better to repair that if it's a simple fault.
Your drives may be OK, but not being step/dir input drives makes life difficult unless you want to fork out $1000+ on a Galil card! Even then I'm not sure yet how well mach is integrated with the Galil's.
The skyco cards I mentioned earlier take step/dir and convert to +-10v velocity command, but If I recall correctly the drives should be running on Torque mode, what differnce it makes over veloicity mode with the skyco I'm not sure.
The final decision is of course down to you, and you have quite a few options. Each have their issues.
With the Gecko's or any other DC Brushed drive with step/dir you would probably be up and running quicker. But you will have to ensure the DC Bus voltage in your lathe is 80v or less.
You should probably also get yourself a breakout board to inteface your parallel port to the machine the CNC4PC type seems to be the best value for money these days.
There are likely things you can resuse from the old control. like the MPG (Jog encoder) if ones fitted.
It's likely your machine also has a spindle encoder, this is not usable for screwcutting with mach via the parallel port. If you wish to have screwcutting and use the parallel port then a simple index signal is required. There are other devices that MAY allow spindle syncing via encoder sooner or later (G100 from Gecko)
Wayne.....