M66 Wait For Arc-OK: L1 or L3?

Paul wrote: Thanks. I think I could use debounce on a few pins. I get the occational limit switch trip at times. That hasn't happened since adding capacitors across those connections..

You can debounce in software. Then it's easy to change the time constant:

www.linuxcnc.org/docs/html/man/man9/debounce.9.html

andypugh wrote: You can debounce in software. Then it's easy to change the time constant:

www.linuxcnc.org/docs/html/man/man9/debounce.9.html

Much simpler (I mean convenient. I'm sure it's not simple!). I should have known you would already have a way to address this...

Thank You

Very nice. I now am using debounce for all inputs. Haven't ran the table too much, but haven't noticed any false triggers so far. Thanks again.

Paul

OK - On the slim chance this happens to someone else looking for a solution, I'm fairly sure I figured out the whole problem. I may have had false arc-ok triggering, but that wouldn't have been the only thing.

Earlier in life, and for another reason, I changed my M66 wait time from 5 seconds to 2 seconds. That worked without any troubles when I ran a high frequency start cutter that could fire the arc while the air was still flowing. I'm now running a cutter that has to shut down the air flow in order to fire the torch. That takes time and the M66 timer must have been timing out a bit too early for this setup.

I am now programmed back to 5 seconds and after 150 pierces, not one delay problem. I kind of figured this out, in part, because I never noticed the first pierce ever moving too soon. I would have guessed all subsequent pierces would have been running into the problem, but maybe I was only noticing the really early (no) delays.

Again - thank for your help...

Paul

OK - So it's not fixed or I don't see any problems on 11 gauge or thinner, but problem still there on 3/16". It just seems like the G04 P0.2 (or whatever) is sometimes being ignored. I ended up using G04 P0.6 to get through the job.

Alone, I can't watch everthing during this time, but by watching the screen's arc-ok light and listening to the torch/table, I don't think the arc-ok is faulting. Is there any suggestions of what I can check or monitor in order to better understand this problem?

Basically, it's: move to position, touch-off, lift to pierce height, fire torch, wait upto 5 seconds for arc-ok signal, wait 0.2 seconds, move Z to cut height, and cut. But sometimes when the torch fires, it's like it is going straight to cut height and moving through the lead-in without any waiting after the torch actually fires.

Any insight greatly appreciated!!

Paul

So - It seemed to be a noise issue. At least it seems so at 65 amps. I replaced the plasma control cable with a shielded one and re-routed the torch lead and after 385 pierces all observing the coded pierce timing, I NOW feel like I have this taken care of.....Again.

Thanks for the replies.

Paul