I've just about got my mini lathe cnc conversion complete but have stumbled a bit with configuring the BoB spindle relay. I want to turn the spindle on and off only with Mach3. Speed will be controlled by a pot. I've assigned Ouput 1 for M3 and M4 as I don't anticipate needing to run the spindle in reverse. Based on the limited information contained in the BoB instruction manual (attached) I enabled Output #1 and assigned Pin 16. Also tried Pin 17. Checked Active Low too with no change. The spindle is not wired to the relay terminals. Using a multimeter and inputing a M3 S1000 command in the MDI I don't detect continuity across the relay terminals. The motors turn and move the carriage and cross slide as expected so I know the board is powered up. Does the relay need a load on it to close the contacts? Is my configuration not correct? Bad relay? Looking for some help and guidance to get the lathe functional.
My configuration screen shots are attached as is the BoB manual.
Thanks