Knowing the Bosch Colt is an AC spindle that will need special hook up to GRBL, is there a way to hook it up so that the variable speed feature and auto on and off can both be controlled by GRBL?
Yes, You would need to use a product like SuperPID. I requires doing modifications to the Colt. You should also make an enclosure for the SuperPID because there is live AC voltage on it.
Thanks Bart, thats EXACTLY what I needed to know !