What do you guys/gals think of this:
At 12A, it seems like an easy/safe way to have the dewalt spindle being turned on by the gcode. More specifically, turned off when the cutting is done. It probably also has enough current for the vac as well.
Added bonus, if cutting the power to the ramps board also cuts input to this relay (which it should), then I can wire an EStop button on the 12VDC power of the ramps, and be able to turn off the motors, and spindle with one, low voltage connection. I’ve got this EStop ready to go, but I don’t feel comfortable wiring it into the 120VAC of the DeWalt. It just doesn’t seem physically sturdy enough.
Another option I’ve been thinking about, but I need to think about some more, is using a fast switching solid state relay. I think I could actually replace the HF speed control with a PWM’ed solid state relay, which would essentially be doing a triac, but I could control it from the arduino. I might have a hard time finding a premade board with a fast switching 10A SSR on it though. And of course, if it costs $100, I’m out. Any thoughts?