I think you need something like this.
http://www.surpluscenter.com/item.as...tname=electric
or gang together a few of these.
http://www.surpluscenter.com/item.as...tname=electric
and one of these.
http://www.surpluscenter.com/item.as...tname=electric
Then you want to use one to send an E-stop signal to the Mach3, which should stop the steppers instantly. Use another to kill power to the power supply. If Mach3 fails to stop it, the power supply should. And you could use another to kill power to the router motor itself.


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