On Tue, 14 Jan 2014, Marius Alksnys wrote:
> Date: Tue, 14 Jan 2014 13:55:37 +0200
> From: Marius Alksnys <[email protected]>
> Reply-To: EMC developers <[email protected]>
> To: [email protected]
> Subject: [Emc-developers] THC functionality
>
> 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.
>
6. Use the PID component for feedback instead of a fixed correction rate.
This would give a big improvement in dynamic performance.
>
> By the way, I have reported a related bug:
> https://sourceforge.net/p/emc/bugs/348/
>
>
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