On Apr 9, 2019, at 10:26 PM, Gene Heskett <ghesk...@shentel.net> wrote:
> 
> On Tuesday 09 April 2019 23:02:46 Thaddeus Waldner wrote:
> 
>> 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
>> Newdale School
>> Elkton, SD 57026
>> 
>> ________________________________
>> From: andy pugh <bodge...@gmail.com>
>> Sent: Tuesday, April 9, 2019 9:34 PM
>> To: Enhanced Machine Controller (EMC)
>> Subject: Re: [Emc-users] Leaving an axis out of the home sequence AND
>> (continued:)
>> 
>> 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?)
>> 
> 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.
> 
> More ideas.  Thanks Thaddeus.
> 

Another idea:
Instead of simulating a home switch with a timer, you could use an actual home 
switch from a different axis (eg. z-axis).

>> --
>> 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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> 
> 
> Cheers, Gene Heskett
> -- 
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page <http://geneslinuxbox.net:6309/gene 
> <http://geneslinuxbox.net:6309/gene>>
> 
> 
> 
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