Sprint 400 driver board

[dazp1976]

I'm puzzled why I get the 90V on the "field" pins and not the "armature" pins, but that's because I don't really understand how motors work. As far as I can tell, the motor only has an armature winding.

I don't think it works without being switched on via 4&5.
Regarding the motor. Look around at information about...
'Armature controlled dc motor'... For both 2 and 4 wire / pole.
Field is the stator and armature is the main rotor.

What about the original motor?. Is that 2 or 4 wire?.

I'll do some reading as well and see if I come up with anything else.
I looked at sherline regarding a replacement motor but due to micromill being originally built as a manual pot... They supply it with a pre-wired little box that has a pot control on it. Not very useful really.


I'm in process of changing into using a proper AC servo on my medium sized mill atm.
I'd have likely got fed up with the Denford by now and considered swapping the motor out to a servo system for it.