Maybe I am thinking too simplistically, but my approach would be:
Start with my 3-axis config
Copy it
add the fourth axis information to the copy
change the name of he config to 4 axis.

The steppers I used cannot have the motor connected while powered.  So this
method suits me.

--J. Ray Mitchell Jr.

"Good enough is the enemy of excellence"author unknown

On Tue, Apr 9, 2019 at 8:50 PM John Dammeyer <> wrote:

> I believe I'll have a similar problem.
> > > Assuming you unplug the rotary axis when you remove it, you could
> > > simply use a normally closed homing switch that unplugs with the axis.
> > > Problem with this is it wouldn’t let you use the fast approach, slow
> > > home sequence with a single switch.
> > >
> > > Thaddeus Waldner
> > unplugging it isn't practical without adding a plug in the switch cable,
> > but some timers could simulate that, and a mux2 to steer the timers or
> > the switch could work. I'll have see if I can set something up along
> > those lines.
> > Cheers, Gene Heskett
> Since my Harmonic Drive/STMBL are an AC Servo it's unlikely that it's a
> good idea to unplug it while the system is powered.  So one has to either
> ESTOP which removes DC or power down the entire system.  Then unbolt the
> rotary table/indexer assembly and remove/unplug it.    Then release ESTOP
> or power up the system again.  Mostly because my Mill Table isn't really
> large enough to keep it there permanently.
> The question then is whether or not the system, when starting can/will
> recognize an input which is a unit present signal.   Can not the HAL files
> be set up to  #include other files?  So based on an input select one of two
> HAL sub files to load.  One with an A axis and one without.  Don't know
> enough about that yet but it's definitely part of what I will need to learn.
> John
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