For those of us using a larger (heavier) spindle (I have a PWN 2.2 80mm) we need to have $212 set so that the spindle doesn’t drop due to the weight. From a safety perspective this voltage to the z-axis should be maintained in the event of a panic button push as the spindle will be spinning for several seconds after activation.
@jpnharris I believe what you’re asking for here is a change to the SLB firmware, correct?
I would guess it is firmware, maybe software but panic stop wouldn’t allow a spinning bit to drop uncontrolled, I don’t like to use the panic stop much but it does happen. On at least two occasions work piece was ruined by falling spindle.
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For grblHAL set $37=4 to keep the Z driver enabled. However, I am not sure if SLB estop cuts power to the drivers - if it does then it will not work.