QTPlasmaC - Skipping Probing

Your Probe Height seems very low to me (0.25"). Probe Height is calculated from the Z axis minimum limit. Normally you would set it so it is above the thickest material that you would cut.
linuxcnc.org/docs/devel/html/plasma/qtpl...tml#qt_initial-setup

The reason for the double pass is because of a bug that appears in the way you have specified the hole cutting:
1: You are specifying #<holes>=2 which adds an overcut at the end yet you specify the distance as zero (#<overcut>=0).
2: We need to catch the above error and pop up an error message.

You usually don't need leadouts with plasma.
 

Thanks for peeking Phill.  

I was going to comment on your heights as well.  You have a lot of "bottom limit reached while THC moving down", and "pierce height would exceed Z axis maximum limit condition found while moving to probe height during ohmic probing" messages in your logs.  

Sushi wrote:

At the end of the day this doesn't correct the issue of my machine moving right past probing

What do you mean by "moving right past probing", what is the machine actually doing?
Any videos?

unless the probe height affects this.

If Probe Height is too low it will probe at Setup Speed, in your case 48ipm.

I'll make sure to turn off leadouts. I'm going to have to look for the number of holes and overcut, not sure where to find these settings.

They are from your post processor.

Do you notice if the Ohmic Sensor indicator is lit when this happens?

What type of ohmic sensor are you using?
 

Sushi wrote:

I've never watched my control, I'm hovering over the pause button and am watching the machine, squinting trying not to look directly at the arc.

My ohmic sensor is a custom creation. I don't see how this design could affect the machine to make it completely disregard the probing cycle.

What I suspect is happening is that it is probing, but your ohmic is tripping inadvertantly for some reason on the second probe and that is what is causing it to appear as if it's skipped the probe cycle, when in fact it's just "sensing" near the top of travel.

You could install simplescreenrecorder and record the screen while you cut when this happens, which you could play back and may give you an indication. Or upload it to youtube for us to watch, or both.

And/or you could watch the ohmic input with halscope during the cut, which would allow you to see definitively if it's tripping during the second M3 command.

It wired from the tip to the probing input and from the table to the other side of the probing input. But there are two dual pole dual throw relays that both have to change states, disconnecting the probe and connecting the fire the torch signal. Works slick and saved me money.

I/we'd have to see this schematic drawn out.

Plasma is a fickle beast. There can be a lot of unexpected gotchas to navigate.