Solved Firmware Skips a few gcode instructions -- known issue?
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Alright, I just completed two more rounds of that same gcode using the beta firmware.
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Probing with my z-probe now appears to be unreliable. It either doesn't probe downward, or probes downward very little. This was very reliable before. I couldn't find any documentation related to changes in this area. Did I miss something?
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After the upgrade I lost my CNC specific web control software. Could this have been the problem? Is there a version of the CNC specific web interface that is approved/safe for the beta firmware?
Those two issues noted: Both cuts completed without error. Here are the "after" photos:
 0_1609353446133_20201230_103159.jpg](Uploading 100%) -
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@N7JTI said in Firmware Skips a few gcode instructions -- known issue?:
Is there a version of the CNC specific web interface that is approved/safe for the beta firmware?
Yes. https://forum.duet3d.com/topic/20416/preview-version-of-cnc-optimized-dwc/36
@N7JTI said in Firmware Skips a few gcode instructions -- known issue?:
Probing with my z-probe now appears to be unreliable. It either doesn't probe downward, or probes downward very little. This was very reliable before. I couldn't find any documentation related to changes in this area.
Would need some more details on your probe.
I do notice that your configuration for the probe is missing some parameters.
@N7JTI said in Firmware Skips a few gcode instructions -- known issue?:
; Z-Probe
M558 K0 P5 C"^!io1.in" F120 T6000 ; Z probe speed and travel speed
G31 Z25.4 ; set the z-probe trigger height to 1 inchG31 is missing P for trigger sensitivity and the X Y offset.
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@Phaedrux The z-probe is just a machined touch plate. Basically it acts like a switch, but really it is just measuring current passing through the tool itself into the touch plate. Well, to be brutally specific, the tool is "ground" and the current source is the touch plate. x-y offset should be zero, as the tool itself makes the contact and there is no offset. The z-offset is 1 inch.
I haven't been able to figure out how to get G30 to do anything like what I need. I've pasted the macro I use to set my z0 below. Should this be possible from a G30 command? How?
The behavior of this macro seemed to be different with the new firmware. I've had to update my "dive height" with an h-parameter in M558 so that it probes toward the workpiece more than just a handful of mm.
z_probe.g macro
; Probe in Z and reset 0
G91 ; Set Relative Mode
G38.2 Z P0 ; probe in the z direction
G10 L20 P1 Z25.4 ; set the z-height of WCS 1 to 1 inch
G0 Z50 ; rise up around 25mm to remove the z-plate
G90 ; Set Absolute Mode -
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Try adding P500 to G31 as well
Does G30 work now?
I'm not as familiar with g38 for CNC
https://duet3d.dozuki.com/Wiki/Gcode?revisionid=HEAD#Section_G38_2_to_G38_5_Straight_Probe
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@Phaedrux Well, that just cost me a bit and damaged my touch-pate.
I ran "g30" and the head dropped carefully down till it touched the plate... and then drove the v-bit straight down into the plate until the motors couldn't drive any further... badly scratching the touch plate and chipping the bit.
So, what I would like to have seen it do is STOP when it made contact with the touch plate.
So, how is G30 supposed to work?
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Well g30 should stop when triggered provided the trigger pin is configured correctly, but I'm not a CNC user at all, so I'm not sue what else could be going on.
If the macro you have using G38.2 works as you expect that should be fine.
Only thing I can think of is to remove the K0 from M558 since you only have a single probe anyway.
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@Phaedrux but the problem I seem to be having with BOTH of these is that the directions are very backwards. instead of lifting on a g30 contact it is diving. And instead of probing DOWN towards the touchplate with the G38 command it is probing UP.
Does the beta firmware probing not pay attention to which direction is positive on my z-axis? This used to work.
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Ok, I think I may have found it. The dive height I set negative becase it was probing the wrong direction... that seemed to have unintended consequences. So it is no longer diving after touching the plate.
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Ok, so here's the problem I've got with G30. It probes the bed and sets the machine coordinates.
That isn't helpful. I need the WCS coordinates to be updated to z0.
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@N7JTI said in Firmware Skips a few gcode instructions -- known issue?:
The dive height I set negative becase it was probing the wrong direction
That would do it.
@N7JTI said in Firmware Skips a few gcode instructions -- known issue?:
That isn't helpful. I need the WCS coordinates to be updated to z0.
Ok, so does G38.2 and the macro you have do what you're needing?
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Ok, the machine seems to be performing mostly correctly now. I'm still seeing my macro probing the wrong direction occasionally, but I haven't caught it doing that in the last half-our. So I'm going to mark this as "solved" since my problem of the head occasionally not lifting seems to be fixed by the updated firmware.
If I can find a clear pattern for when the probing macro probes "towards the workpiece" in the wrong direction I'll open another question.
Thanks again for the great support!
