Novamill - Mach3

[m_c]

Looks like they've patched the PWM signal into the original interface board, in which case you just need to work out the PWM settings to control the spindle speed.


You'd need to confirm, but if you wanted, you might be able to connect the Sprint direct to the BOB, as I think the 0-10V circuit on the BOB is isolated from the 5V control circuitry.
You could confirm by removing the 12/24 wires to the BOB and checking everything else still works, and also checking that the Gnd for the 12/24VDC supply isn't connected to the other BOB Gnds, and only connects to the 0-10V Gnd. If that's the case, then you'd just need to add an isolating DCDC converter to get an isolated 12VDC supply to provide the required isolation.