I agree  with Jon:

You really HAVE to have a hardware E-stop!
>
> The business with the pointer focus on the GUI is pretty
> dangerous, and I run into it all the time.


'In the Beginning' I just used the E-Stop input pin from the HAL,
but I was wondering if this is safe enough so I now added a 'real' E-stop.

I have a simple machine switch (one of those solenoid controlled Red/Green
button things) and just placed an E-stop button in the feed line to this
switch (it is a normal closed switch).
This combination provides power two relays: one 3-phase relay to provide
power to the servos and VFD for the spindle and one relay connected to the
E-stop input of EMC2.
So hitting the E-stop both cuts power to the power parts and also signals
EMC that the machine is stopped.

I thought that installing an E-stop was more important than limit switches
but I guess I was wrong: I need both ...

Regards,

Rob
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