Features I lack in thc component:
1. height reset
I am not using any sensors to check for real distance to material
before cutting. I am trusting programmed coordinate instead. That's
why I would like to reset THC height between cuts, probably while in
safe-Z.
I noticed that correction remains even after thc.enable pin is low.
Maybe it is important to note: I am not using thc.z-fb-out pin.
I am thinking about adding thc.reset pin to thc component and net it
to digital-out-nn. Then, play with it in NGC program. But maybe
someone could offer a better way?
2. Correction limiting. I would like to limit thc correction (for
safety and for plasma nozzle protection) to let's say [-5..+5] mm.
And when it goes out of it - turn machine off.
3. Internal arc-ok signal with time-out safety function. Now I am
generating it with wcomp, without time-out yet.
4. Starting near the edge. Like SidePierceMode or Side Entry Mode in
this article:
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?GantryPlasmaMachine
5. Stopping near the edge. Maybe just add digital-out-nn and control it
from NGC. It would be nice for machine to make move without stopping.
By the way, I have reported a related bug:
https://sourceforge.net/p/emc/bugs/348/
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