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General Mach Discussion / Re: Dwell keeps comming on and i cant shut off spindle even with E Stop
« on: September 30, 2014, 05:56:23 PM »
The spindle should not only be controlled with dwell but also a relay that disables it on e-stop. Without the relay the machine is unsafe as you could have a spindle become active during a tool change. The relay should be wired to only close on active high. That way if you lose power the spindle is disabled. In some cases it is prudent to use both a belt and suspenders.
Bob
Bob