you can control the spindle from nc studio on the pc however as soon as your raise the spindle speed over 10000 that is when it cuts out, it strats back up as soon as you go back down.

I will take a look were the grey cable goes when I'm next at the machine.

If you could tell me what the values should be for each of the program setting that would be great! the setting the chap on cnc zone unfortunately did not help. the spindle is 220v 6A and we are on 240v mains power here in Australia.

many thanks