Probe Basic - intermittent erratic probing
15 Oct 2024 12:16 #312145
by spumco
I forgot to test using the cable (bypassing potential wireless issues) last night, I'll try that as well.
If all else fails, I've got a difference wired probe (ITTP) I could scab in and test to eliminate the probe being the problem.
Replied by spumco on topic Probe Basic - intermittent erratic probing
Will do. Any idea why this is the case?Try using just fast probe and zero out slow probe fr in the parameters page of probe basic, sometimes to slow of a break causes issues
I forgot to test using the cable (bypassing potential wireless issues) last night, I'll try that as well.
If all else fails, I've got a difference wired probe (ITTP) I could scab in and test to eliminate the probe being the problem.
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15 Oct 2024 12:55 #312150
by Lcvette
Replied by Lcvette on topic Probe Basic - intermittent erratic probing
the nature of tripod probes, seems that a faster approach speed yields a more positive switch occurence and less chance of a bounce. its not constrained to linuxcnc, this is a known issue on many control systems. on my machine i use only a single touch with fast feedrate and a feed of 8-10ipm. as long as the calibration is done at the same speed it yields extremely consistent precision and repeatability, +/-0.0001"
the xy clearance is also important, you should have enough distance to allow the probe to be moving at speed and not contact during acceleration. post a screenshot of your probing parameters and i can take a look.
fwiw, wired probes have much less of a chance of having issues, i have found that the wireless probes can false trigger, depending on the type, an IR type isn't great around flourescent lights and radio type can pickup interference. the higher end probes typically use a combination of both to minimize false triggers and interference issues. cheaper ones are typically a single layer type.
the xy clearance is also important, you should have enough distance to allow the probe to be moving at speed and not contact during acceleration. post a screenshot of your probing parameters and i can take a look.
fwiw, wired probes have much less of a chance of having issues, i have found that the wireless probes can false trigger, depending on the type, an IR type isn't great around flourescent lights and radio type can pickup interference. the higher end probes typically use a combination of both to minimize false triggers and interference issues. cheaper ones are typically a single layer type.
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15 Oct 2024 13:17 #312151
by spumco
Replied by spumco on topic Probe Basic - intermittent erratic probing
Not at the mill now, but here are the parameter values I was fiddling with last night:
Traverse: 50-60ipm
Slow probe: 1-4ipm
Fast probe: 15-25ipm
XY back-off clearance: 0.025"-0.050"
Z back-off: 0.025"-0.050"
I can certainly test other values tonight - perhaps start with slow=0, and fast=10ipm?
Traverse: 50-60ipm
Slow probe: 1-4ipm
Fast probe: 15-25ipm
XY back-off clearance: 0.025"-0.050"
Z back-off: 0.025"-0.050"
I can certainly test other values tonight - perhaps start with slow=0, and fast=10ipm?
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15 Oct 2024 13:33 #312154
by tommylight
Replied by tommylight on topic Probe Basic - intermittent erratic probing
Just shooting from the hip here, but did anyone try to add 22-100nF capacitors to probe outputs or controller/Mesa inputs?
That is nano farads.
Seems like the probe is being triggered from vibrations while the machine is moving, but i do not have one to test.
That is nano farads.
Seems like the probe is being triggered from vibrations while the machine is moving, but i do not have one to test.
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15 Oct 2024 13:46 #312157
by Lcvette
Replied by Lcvette on topic Probe Basic - intermittent erratic probing
yeah bump up that clearance, you are likely blowing through that small clearance amount on the fast feed rate if using a wireless probe, give it 0.100 - 0.1500" if using fast and slow probe, make sure you calibration is done at the same final feedrate. to start i would use just a single touch with slowfr zeroed out. try the below parameters and report back:Not at the mill now, but here are the parameter values I was fiddling with last night:
Traverse: 50-60ipm
Slow probe: 1-4ipm
Fast probe: 15-25ipm
XY back-off clearance: 0.025"-0.050"
Z back-off: 0.025"-0.050"
I can certainly test other values tonight - perhaps start with slow=0, and fast=10ipm?
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15 Oct 2024 14:52 #312163
by spumco
I've got a motion-type filter in place so that the probe signal is only connected to motion.probe-input during a probing move. That has eliminated the 'probe-tripped-during-a-non-probing-move' errors I was constantly getting.
However, that wouldn't do anything for vibration-induced probe triggers during a probing move. That issue is what I was hoping the debounce filter would eliminate.
Replied by spumco on topic Probe Basic - intermittent erratic probing
Tommy,Just shooting from the hip here, but did anyone try to add 22-100nF capacitors to probe outputs or controller/Mesa inputs?
That is nano farads.
Seems like the probe is being triggered from vibrations while the machine is moving, but i do not have one to test.
I've got a motion-type filter in place so that the probe signal is only connected to motion.probe-input during a probing move. That has eliminated the 'probe-tripped-during-a-non-probing-move' errors I was constantly getting.
However, that wouldn't do anything for vibration-induced probe triggers during a probing move. That issue is what I was hoping the debounce filter would eliminate.
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16 Oct 2024 12:11 #312245
by Lcvette
Replied by Lcvette on topic Probe Basic - intermittent erratic probing
get it sorted?
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16 Oct 2024 18:34 #312285
by spumco
I'll have a go tonight and report back.
Replied by spumco on topic Probe Basic - intermittent erratic probing
Hijacked by a 'domestic' crisis last night, no time to test.get it sorted?
I'll have a go tonight and report back.
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16 Oct 2024 22:22 #312307
by spumco
Replied by spumco on topic Probe Basic - intermittent erratic probing
Well that did the trick.
Removed the second slow probe, increased the fast probe speed to 8, and cut debounce back down to 2.
10 out of 10 clean probes!
Upped the speed to 25, re-calibrated, and it's still repeating perfectly. Deviation between pocket probes is maybe 0.0001" 2 out of 10 sequential probes. The other 8 of 10 are perfect repeats.
Even found a probe rotational position where X and Y are a perfect match.
Thanks a TON for the assistance. Now I just need to figure out how to incorporate the probe's error signal in to the probing routines so it stops if the RF error is present during the probing.
Removed the second slow probe, increased the fast probe speed to 8, and cut debounce back down to 2.
10 out of 10 clean probes!
Upped the speed to 25, re-calibrated, and it's still repeating perfectly. Deviation between pocket probes is maybe 0.0001" 2 out of 10 sequential probes. The other 8 of 10 are perfect repeats.
Even found a probe rotational position where X and Y are a perfect match.
Thanks a TON for the assistance. Now I just need to figure out how to incorporate the probe's error signal in to the probing routines so it stops if the RF error is present during the probing.
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16 Oct 2024 22:52 #312311
by Lcvette
Replied by Lcvette on topic Probe Basic - intermittent erratic probing
Great news! Glad you got it sorted! 25 is a bit fast for small holes, I would recommend finding a balance to be able to achieve full acceleration in small holes to ensure the probe event is at speed for best consistency. But finding the sweet spot is easy now that you're not getting errors.
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