Conect 121 CNC Lathe Project

[m_c]

You can connect a pot, which if you have one laying around (IIRC they're normally around 100k), I would wire up just to check the drive still works. But as I've already mentioned, be aware those control terminals are probably around half mains voltage.

However I'd aim to keep the spindle computer controlled.
Most breakout boards are capable of 0-10V control, and just need an isolated 12V power source to avoid issues with non-isolated drives. A small DCDC converter is typically used for this, but that power board may already provide an isolated supply.

Inhibits on those boards generally need connected to inhibit. In the case of H, it needs power applied, or in the case of L needs connected to 0V (which may not be 0V in relation to earth)

[mtrehy]

No luck yet with the motor controller. It has 240v to it, I can measure 12v across pins 12 & 10. I attached a pot to 12 & 10 and 11 and can vary 11 between 0-12v but not seeing any output from the motor controller. Tried it with inh connected and disconnected. The motor turns if I attach a 12v supply directly to it. Is there any more I can try with the original motor controller? There is also a component attached below the motor - not sure hat this is...?