Precision Piezo z probes guide for duet users reference
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So, it seems I've gotten mine into a working state now. Haven't printed yet, as I'm also moving the extruders around to install Capricorn tubing. This is a SeeMeCNC Rostock delta V2, with Hayden's mag arms, PEI adhered to boro glass, on 7mm MIC-6 aluminum bed.
In a nutshell (these steps were actually many, many iterations and trying other things):
- Piezo seemed far too sensitive to any movement at all
- VR1 to positive pin was 500K ohms, adjusted down to about 230K (decreasing sensitivity)
- Adjusted VR2 to ever so slightly beyond where the red LED just comes on (decreasing sensitivity)
- Went round and round with P5 (digital) settings, ultimately went with P1 (analog), matching kraeger's experience with the same printer
- Due to my machine's specific Frankenstein collection of mods, re-arranged wiring going to effector
Relevant config.g lines:
M201 X1000 Y1000 Z200 E1000 M558 P1 I1 R1 F300 H5 T2400 G31 X0 Y0 Z-0.1 P400Z acceleration ended up at 200 mm/sec, and the P (threshold) became 400. The resting Z-probe value (as shown in the DWC) is 340. I tried P360, but the box turned green and deviation increased. I think P380 was also flaky, so I stuck with 400 - it's enough of a difference from the resting value to require a distinct tap, but still low enough to be reasonably sensitive. I could likely reduce the R (pause) value, but it's pretty insignificant. As I haven't printed yet, I haven't adjusted the G31 Z offset value.
My deviation at 90mm radius is 0.04, which isn't great (and slightly worse than what I can get with the Smart Effector), but I believe that's due to the mount, not the sensor. This is without any H offsets in the bed.g file. That's a time-consuming process, that I'm putting off for now.
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I'm glad it's working and that you've dialled it in.
I'm not sure h values are really that applicable since there is no difference to measure between the trigger height and the actual nozzle to bed gap as they are coincident and basically 0. That's not to say the effector isn't tilting to some degree and on some (probably most) setups, but I imagine the effect is just that the nozzle prints nicely onto the bed at extreme coordinates, but at 89 or so degrees to the bed rather than 90.
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Hey, again. The piezo was working fine for several builds / hours, but then one day suddenly reverted to being overly sensitive again. I checked that the resistance measurements on both trimpots hadn't changed, and then went back as I had previously done to dial back the sensitivity.
That worked for a few days, but then the oddity occurred again, but this time it suddenly became very insensitive. In both cases, I know of nothing that would have caused the changes. Both times, I was printing fine the day before, and when I went to start a print the next day, the problems were immediately there. There's been no change in the mount, possible disturbances or damage to the printer, no one has touched it, etc.
It seems as though there might be a cracked or poor solder connection somewhere. As I had posted earlier in this thread (14 March), I've never measured 10K from VR1 to a negative connection - always 0.5 or less. No one commented on that, so perhaps that's not an issue.
Any ideas?
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I'll get Idris to chime in on this one.
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@plasticmetal said in Precision Piezo z probes guide for duet users reference:
changes. Both times, I was printing fine the day before, and when I went to start a print the next day, the problems were immediately there. There's been no change in the mount, possible disturbances or damage to the printer, no one has touched it, etc.
That's very odd behaviour, it suggests that VR1 is occasionally going open circuit. Are you able to measure the resistance between PZ+ and PZ- while turning VR1 (gently) from one end of it's travel to the other?
Can you drop me a PM or a message on the website with your order number, I may need to send you a replacement.
Idris
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@moriquendi said in
Can you drop me a PM or a message on the website with your order number, I may need to send you a replacement.
I've sent a message via your website. Thanks!
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Hi @DjDemonD ,
I have recently installed an Orion on my Kossel XL and would like to make a modified version of the groovemount part. Is it possible to obtain the STL for that please? Even better would be an scad file if that's available.
Thanks,
Mark
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Is anyone alive at Precision? I replied on the 17th to an email from Idris for troubleshooting, and haven't heard anything since. I replied again on the 20th and yesterday, and still no word.
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Hi I'll give Idris a nudge. Sorry you haven't heard from us since then.
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@plasticmetal What email address did you use? I can't find any emails I've not responded to. Failing that try sending a message through the website.
Idris
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Thanks to both of you for replying. I don't see a way to PM through this forum, so I'll reply here.
Following my question earlier in this thread, I initiated contact through your website, and received a reply from Idris on the 17th. This was from reply at crm . wix .com. I replied through that email, which had a "reply to" field of eaQ0....TtA at the same domain.
All three of my reply attempts have been to that same email. I've checked the spam inbox, and there aren't any messages there (and as the first email came through fine, I wouldn't expect later ones to get flagged).
Thanks for trying to get this resolved.
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I suspect something has gone wrong with the reply address somewhere. If you'd like to send an email to precisionpiezo at yahoo dot com hopefully that'll come straight through.
Idris
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Thanks, just sent via yahoo.
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Hi
I have installed the Orion piezo and it works . When performing G29, the first 6 point are probed, then it will always trigger before probing at 1 specific point on the bed (left,back, point number 7)....I think this has to do with some more movement due to the cable at that point...is it possible to pause a bit in G29 before probing, to let it stabilize...couldn't find a parameter for that. When doing G30 at the problem x,y point it always probes correctly -
BTW I have this in config.g
M558 P5 I1 R0.9 F120 X0 Y0 Z1 T3000ยจ ;Piezo
G31 X0 Y0 Z-0.1 P100 ;piezo -
It seem sthat M558 R0.9 (before 0.4) works
Description of M558 is confusing
"Z probe recovery time after triggering, default zero " I think it means before probing not after triggering. Or? -
So R is a pause before probing. Use around 0.4 seconds, some points on the bed might false trigger if your bowden cable goes tight.
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I have an Orion on a new build (not in service yet). I'm using this in config.g:
;Precision Piezo Orion
M558 P8 I1 H5 R0.5 F150
G31 X0 Y0 Z-0.05 P600Last night I finally got the Orion wired and was able to home Z with it several times... all was well. This afternoon I came back to it, and it crashed the bed (not bad, I have the speed fairly slow and was able to kill it quickly). I discovered that the blue LED (trigger) is constantly lit. What can cause this?
Thanks!
