Just coming into this discussion now !!

I too want the option to disable the servos and use the machine manually with
the dro. Hence my choice of servos and linear scales. I have South Western
Industries mill now it is both manual and CNC and I wouldn't change it for the
world. PS it doesn't have a pendant and I wouldn't ever want one.  

Just a note - Estops should be a hard wired and when activated, it stops
everything and is only ever used for emergency or a serious fault detected. 
Nothing else. 

As for the VFD speed, use switch or relay to engage a pot that sets the speed
in manual, same switch could be used to tell LinuxCNC it's in manual mode.  .

Cheers Wallace


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