On Wed, 10 Apr 2019 at 02:33, Gene Heskett <ghesk...@shentel.net> wrote:

> out of the logic that determines whether the machine will run gcode when
> that A axis has not been homed because its unplugged, off the machine
> and stored and either is unhomed, or was never homed since this power
> up.

The simplest is probably to set it for immediate homing (home search
velocity zero) but have it in the homing sequence.

If you want it to physically home when present, but not home when
absent, automatically, then it's harder. I imagine that some HAL logic
to detect presence or absence and a mux2 to switch between real and
simulated home (wcomp looking at apparent position of the stepgen?)

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916


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