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Enjoy the Novamill. I got one also without electronics and followed a similar route with DM542 drives etc, but using Mach 3. Have been using it now for 6 years, very pleased with it, a nice machine.

It actually says

Control terminal number 5 -- +10V Reference -- Analogue output, +10v Reference for speed and current set points

It's the 10v you connect to one end of a pot, with the other...

http://eusurplus.com/index.php?route=product/category&path=63

Toolman there is also quite a few sticky threads in the Stepper and Servo forum if you would like a better understanding and some more reading.

Link:...

Nema 24s will perform far better than 34s for that size of machine.

Combine with good drives and power supply, and you'll get better performance than 34s.