You should be able to identify the control signals with a meter and work out where to insert signals and at what voltages,
nothing works so I cant trace the signals.

The only thing is you'd need to ensure the 0-10V for the spindle speed is isolated, or upgrade the spindle drive to something that doesn't need an isolated speed control.
So if if i power the BOB from the 5v of the conect board will that not work?

Yes I will replace the stepper drivers but I would like to use the DC spindle motor?