On Monday 01 September 2014 12:23:39 Jeff Epler did opine
And Gene did reply:
> From the "motion" manpage:
> 
>        motion.spindle-at-speed IN BIT
>               Motion will pause until this pin is TRUE,  under  the 
> following conditions:  before the first feed move after each spindle
> start or speed change; before the start of every chain of
> spindle-synâ€گ chronized  moves; and if in CSS mode, at every
> rapid->feed tranâ€گ sition.
>         http://linuxcnc.org/docs/2.6/html/man/man9/motion.9.html
> 
> In the situation you describe, the docs indicate that motion will
> continue, not be paused.
> 
> Jeff

I had a different pin in mind with my reply Jeff, but the NEAR module 
output would need inverted according to this from man 9 motion:

motion.feed-hold IN BIT
              When Feed Stop Control is enabled with M53 P1, and this bit 
is TRUE, the feed rate is set to 0.

Apparently it must first be enabled with the M53 P1, which I would put in 
the nc files pre-amble as part of the default setup.

No clue how badly that might mark up the work should it occur though.  
Obviously depending on the rigidity of the machine.

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>
US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS

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