The mill has homing switches on all axes
I wired all limit switches and verified behavior of every limit switch
and every estop button.
Now both estop buttons work. Also all five limit switches work.
I have also discovered something nice: the mill actually has separate
home switches on all axis.
However, the schematic that I have, has no reference to those, it may
be an extra option on my mill that is not reflected in standard
schematic.
I understand that with homing switches, my mill could very rapidly home
itself in all three dimensions at once. Which is a plus. At the same
time, it is not an absolute necessity.
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