For PhillC regarding PlasmaC and Z axis stuff

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28 Apr 2020 13:12 #165976 by tommylight
Yes, i am hitting the bottom limit, or the negative side of movement.

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29 Apr 2020 01:42 #166047 by phillc54

also says fix limits and restart

I don't understnd this meassage, it comes from motion and there is no motion while probing, plasmac takes control.

I have been probing this morning at 1200mm/min with no issues. I setup some feeler gauges and I can have a 0.01mm difference between a probe being successful or hitting the lower limit and it has consistently worked as intended.

This is so frustrating, would you believe the actual float travel I ended up with is 6.66mm. An apt number for these circumstances...

I thought I show my hi tech float switch on the little sherline mill.
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29 Apr 2020 03:03 #166053 by phillc54
Some minor adjusting has got it where I can hit the bottom limit and activate the probe at the same time.

It shows the plasmac error "bottom limit reached while probe testing" then times out and recovers which is the expected behaviour.

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29 Apr 2020 10:29 #166075 by tommylight

This is so frustrating, would you believe the actual float travel I ended up with is 6.66mm. An apt number for these circumstances...

LOL, happening quite often these days.
Nice setup.

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01 May 2020 05:34 - 01 May 2020 08:37 #166276 by phillc54
I have pushed some changes to probe testing:

The Probe test button turns red when a probe test begins then the seconds count down on the button.

If it thinks it will hit the bottom limit it prints an error then imediately returns to the start position then restores the button to normal.

If you use Buildbot it may be a while before it builds the packages, it seems to be having a sleep.
Last edit: 01 May 2020 08:37 by phillc54.
The following user(s) said Thank You: tommylight, snowgoer540

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15 May 2020 15:14 #167853 by tommylight

If you needed to I could make a pin or parameter to adjust it with a HAL setp

That was regarding retraction speed, as you might have noticed on the screenshots on the vertical axis GUI topic, for 8 hours and 44 minutes of work time i had 3 hours and 55 minutes of probing time.
Thank you.

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15 May 2020 23:31 #167902 by phillc54

That was regarding retraction speed, as you might have noticed on the screenshots on the vertical axis GUI topic, for 8 hours and 44 minutes of work time i had 3 hours and 55 minutes of probing time.

I still have a problem understanding this.

Z goes down at Probe Speed (Config Panel).
Material sensed.
Z goes up at 0.001mm per period
Material not sensed - this is the zero point
Z moves up to Pierce Height at Setup Speed (Cconfig Panel)

The amount of Z motion up to turn the switch off should only be the switch hysteresis plus overrun.

I use a mechanical microswitch and it is somewhere around 0.25mm so about a quarter of a second of Z travel.

I see your Z accelleration is 750 and your probe speed is 500 so your overrun should be around 0.05mm, that is .05 seconds of Z travel.

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16 May 2020 09:32 #167933 by rodw
I wonder if this should not be a bit like the home switches. Smash down fast, back up a bit slower till it breaks and then go down again at a slower speed till touch, then come back up at 0.001/period.

Also I'd like the torch to go up to max height at the end of the job so that the torch is away from the water table and not splashing everywhere..... geez we are demanding bastards.....
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16 May 2020 09:32 #167934 by tommylight
The issues i was having with Z stemmed form high velocity, as sometimes the axis would move past the limits set in ini, error and report, advise to fix limits and restart Linuxcnc, Any attempt to move any axis after this would bring another prompt saying "starting form beyond limits" but will not move any axis without restating Linuxcnc. Had the same issues with other axis while tuning stuff.
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I am using a different float setup on new machines, so the float has to travel 7mm to trip the switch + 2mm of overrun, them move up the full length plus pierce height, so that makes 12mm of retract travel on every probe. That can be clearly seen here:
forum.linuxcnc.org/show-your-stuff/38547...uild?start=60#167665
I can shorten the bolts that hold the floating part to about half, halving the probe time, without the need to slow down the Z axis.
At any rate, please do not worry about it.
Thank you very much for everything.
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16 May 2020 09:38 #167936 by phillc54

I wonder if this should not be a bit like the home switches. Smash down fast, back up a bit slower till it breaks and then go down again at a slower speed till touch, then come back up at 0.001/period.

That how I do my probing, my probe height is 1mm so it always hits first at the fast speed.


Also I'd like the torch to go up to max height at the end of the job so that the torch is away from the water table and not splashing everywhere..... geez we are demanding bastards.....

I have often thought about this as well. Unfortunately PlasmaC doesn't know about jobs, only cuts.
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