Best practice for fitting a kill switch

Software / Firmware EstlCAM
11

I have grbl running on a Teensy board. I use the breakout board’s DOOR signal on my Big Red Button. This

  1. Stops spindle in 1 sec (brake resistor installed. BRB actually cuts power to VFD which triggers braking)
  2. Stops feed instantly.
  3. Pulls the cutter up to its highest position, in about 3 sec.
    All steppers stay energized, no steps lost.
    Resetting the button, restarting spindle, and hitting Cycle Start resumes the job where it left off.
    I also have a total power kill switch which is the big red TEST/OFF button on my RCD (gfci, for Americans). That would get used if there is arcing, fire or other emergency where ruining the job is a minor consequence.
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