Quote Originally Posted by cooliced View Post
the DIR on spindle V3 board is on pin 8, so i need to set the Spindle Dir pin to 8? and for the motor output it needs to be something like 14 (not being used/connected)
In that case, you need to set the relay output # to pin 8, and set the Spindle Dir pin to something that's not being used.
You need to use the spindle relay option (can't remember the proper name and I don't have Mach on this comp to check, but the top left box in the spindle settings page), to turn the spindle on/off.

You can't use the Spindle direction pin to switch the power on/off, as Mach keeps 'dir' pins at their last set state, until that axis changes direction again. I.e. if you set it so Dir goes active when forward is selected, it will remain active, until you issue a reverse command.