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Precision Piezo Z-probe Now available.

Posted by DjDemonD 
V2 board will not respond
June 06, 2018 04:32PM
I have a new V2 board connected to a 27mm piezo (Murata 7BB-27-4L0). I have set VR1 at ~0.4MOhm and adjusted VR2 just past where the blue LED turns off and the red LED turns on. Tapping directly on the piezo sensor does not turn off the red LED. Pressing and holding and then letting up does not affect it either (this is direct action on the sensor itself). I've tried reversing the polarity just to be certain, but still no response. I've adjusted VR1 out to about 0.9 MOhm and down to about 0.25 MOhm without seeing any change in behavior. I've readjusted VR2 several times - still not change. Using a digital voltmeter on the leads from the piezo does reveal a voltage spike when it is tapped. I've even tried a second piezo just to be certain. Any suggestions?
Re: Precision Piezo Z-probe Now available.
June 06, 2018 05:53PM
You may may have VR2 180deg out of position, the flat on the adjuster should be roughly closest to the connection pins. Another possibility is that you don't have a good connection between the piezo and the board, can you check for continuity between the solder joints on the piezo and the pins on the board when the piezo is plugged in.

Idris


{Precision Piezo} Accurate, repeatable, versatile z-probe plus piezo discs, endstop cables, pt100, 50w heaters.
Re: Precision Piezo Z-probe Now available.
June 06, 2018 07:28PM
VR2 was 180 degrees out of position - that solved the problem. Thanks so much!
Re: Precision Piezo Z-probe Now available.
June 07, 2018 03:34AM
That was easy smiling smiley

Idris


{Precision Piezo} Accurate, repeatable, versatile z-probe plus piezo discs, endstop cables, pt100, 50w heaters.
Re: Precision Piezo Z-probe Now available.
June 11, 2018 09:36PM
Hey everyone,

Recently received my orion kit and quite happy with the possibilities of it. So far I have it working only as a endstop as when I tried having it set the Z height and autocompensate it was not better then my manual bed leveling. Im almost certain I am doing something wrong with my startup gcode.

Im using smoothieware with a cartesian printer and would really appreciate if someone could post their startup gcode and what leveling strategy they are using!
Re: Precision Piezo Z-probe Now available.
June 12, 2018 11:13AM
Just received a production Orion and I can't seem to tune the unit.

It is either solid triggered or solid signal. I have tried removing the unit from the X carriage and tuning it on the bench but the VR seems to operate like a switch.

Not that should make any difference but the Orion is connected to the Probe connector of a Duet WiFi
V+ to 3.3V
GND to GND
Sig to In

M574 X1 Y1 S1 ; Define active low and unused microswitches
M574 Z1 S2 ;
M558 P8 R0.4 H5 I1 F150 T6000 ; Set Z probe type to digital, the axes for which it is used and the probe + travel speeds
G31 X0 Y0 Z-0.18 P100 ; Set Z probe position relative to the nozzle and the trigger height
M557 X0:400 Y0:400 S100 ; Define mesh grid
Re: Precision Piezo Z-probe Now available.
June 12, 2018 12:10PM
At the risk of answering my own question.

After cycling back through the recent questions it looks like VR2 was 180 degrees out of position thumbs up
Re: Precision Piezo Z-probe Now available.
June 12, 2018 02:53PM
What's your bed levelling process?

If I remember correctly I had to:

Home (G28)
Probe (G31)
Save Map (M374)
Load Map (M375)

Then print.

Idris


{Precision Piezo} Accurate, repeatable, versatile z-probe plus piezo discs, endstop cables, pt100, 50w heaters.
Re: Precision Piezo Z-probe Now available.
June 12, 2018 06:32PM
The part im a bit confused about is setting the Z height, does that need to be done sepereately from the probing sequence? Im going to try your method of saving and loading right after but I was under the impression that if im running G32 in my startup gcode there is no need to save and reload the probed grid its already being used directly after G32? Im also unsure if I need the G90 command in there.

M109 S130 ; set extruder
G90 ;absolute positioning
G28
G32
M109 S[extruder0_temperature]
Re: Precision Piezo Z-probe Now available.
June 18, 2018 01:01PM
I just got my orion kit (order 10773) and I had some questions about the mounting of the PCB.

First the clamp on the E3D V6 was too tight. I tried to screw it together but there was too much gap to make up and I was worried I would break the part. When I put the screw in and tightened it there was twice as much gap on the front than the back. Ultimately I had to remove some material from inside the groove mount to get it to fit. Is this normal? Or was I just being too timid?

Second, the small raised sections around the screws and the center were not at the same height. So when you put in the PCB the center would get pushed up as you tightened the screws. Is this the intended fit?

I put some small teflon washers around the mounting screws so the PCB would be flat. I am just not clear on the purpose of putting stress on the PCB.

As far as operation goes it worked great. I had to enable double probing on Marlin to eliminate false readings, but my map looked good.
Re: Precision Piezo Z-probe Now available.
June 18, 2018 01:19PM
I can't answer the first one but the second I can. There is intentionally a slight difference between the centre and the 4 corner screws height to the PCB, this creates a slight preload on the piezo discs. This increases accuracy and decreases Z offset. However if its working for you I'd be personally inclined to leave it. If feeling scientific do some accuracy and repeatability tests with it as you have it, then without the washers and compare.


Simon.

[www.precisionpiezo.co.uk] Accurate, repeatable, versatile z-probe plus piezo discs, endstop cables, pt100, 50w heaters. PT1000 cartridge sensors plug straight into duet boards and others.
Published:Inventions
Re: Precision Piezo Z-probe Now available.
June 19, 2018 01:41AM
Two days ago I replaced the universal piezo V2 with the Orion on my heavily modified Tevo Tornado and since then I'm struggling to get it working. The Orion board works as expected - by tapping anywhere on the hot end or the mount it triggers the blue led. Ironically tapping on the nozzle, where it's supposed to be most sensitive, it needs considerably more force to trigger. I can configure it to trigger with a very slight tap (even on the nozzle) but then it triggers immediately when the probing starts moving the hot end down and if I turn the VR by 1/100 of the millimeter anticlockwise it becomes not sensitive enough and the nozzle pushes the bed until it flexes by 5-6 mm before it triggers. The previous setup was working fine with 360 mm/min (6mm/s) probing speed (6*60) in Marlin, I did try to increase it to 480mm/min (8mm/s) - (8*60), but it didn't make any difference. Please advice, I'm feeling that I'm doing something wrong. I really like the rigid setup of the Orion and I switch to it after crashing a few piezo disks with the universal board V2 (by accidents, failed prints, etc....), but so far it doesn't work for me.

Regards:

Valentin
Re: Precision Piezo Z-probe Now available.
June 19, 2018 08:57AM
Valentin,

Try loosening the four assembly bolts slightly, start with 0.5 turns per bolt and test sensitivity again, you may need to do this a couple of times but in some setups this can make a big difference.
Another possibility is that you have turned VR1 too far and need to turn it back by 180 degrees before retuning.
Do you have "pause before probing" enbled?

Knabo,

The clamp is designed to be very tight on the heatsink, however it is possible that some support material was left behind. Alternatively, some clone heatsinks are not made to the same tolerances and this can also cause problems.

The clamp is designed to preload the PCB, this improves accuracy and increases rigidity of the nozzle.

Idris


{Precision Piezo} Accurate, repeatable, versatile z-probe plus piezo discs, endstop cables, pt100, 50w heaters.
Re: Precision Piezo Z-probe Now available.
June 20, 2018 01:39AM
Quote
Moriquendi
Valentin,

Try loosening the four assembly bolts slightly, start with 0.5 turns per bolt and test sensitivity again, you may need to do this a couple of times but in some setups this can make a big difference.
Another possibility is that you have turned VR1 too far and need to turn it back by 180 degrees before retuning.
Do you have "pause before probing" enbled?

Thanks Idris, I will try loosening the 4 bolts. The VR1 is OK (in fact I never turned it more than 30 degrees away from the original position) and the pause before probing is also set to about half a second, so this is not the problem. I already have a pretty good experience with the Universal board, so I'm familiar with the "behavior' of the sensor.
Re: Precision Piezo Z-probe Now available.
June 20, 2018 10:25AM
Let me know how that goes.

One thing to check, did you replace the wiring when you installed the Orion? The pinout is different from the V2 boards.

Idris


{Precision Piezo} Accurate, repeatable, versatile z-probe plus piezo discs, endstop cables, pt100, 50w heaters.
Re: Precision Piezo Z-probe Now available.
June 20, 2018 04:19PM
The Orion does seem to be sensitive to being over tightened.

I am not sure if it’s because I am using a custom header but I have found that I have to wind back the screws a lot further than I would have thought.
Re: Precision Piezo Z-probe Now available.
June 22, 2018 03:33AM
Quote
Moriquendi
Let me know how that goes.

One thing to check, did you replace the wiring when you installed the Orion? The pinout is different from the V2 boards.

Idris

Thanks Idris, I did change the wiring before everything else, thanks. Loosening the 4 bolts did a magic! I had to loosen about 3 or 4 full turns, it was very tight. My suggestion is loosening to the point it start having slack, then tighten a bit just enough to remove the slack and leave it there. I think with the Orion you 'nailed it' guys! It's so much better than the piezo20! If someone is still hesitating between the two, I can suggest from all my heart the Orion! Looking the 16 point auto bed leveling with Orion with 8mm/s probing speed is like watching a magician trick! There is 0 flex on contact between the nozzle and the bed, just amazing, it just stops so suddenly that it looks unreal. With the piezo 20 I always had some flex in the bed and mount. And the VR1 is not even set to the most sensitive position. When other axes are moving the blue led almost never lights up, just occasionally. It's so much better!

If I have to sum up the pro's and con's for the Orion compared to the original piezo 20 :

pro's:

1. Rigid, much more stable mount, there is nothing fragile to break, can sustain quite hard abuse.
2. When properly mounted and configured - zero flex, it triggers like magic the moment it touches the bed
3. Much more precise and stable probing, repeatability is amazing.
4. Easier to mount / to design mounts
5. Easier wiring and setting up, only one VR and standard end stop wiring
6. No consumables to replace (fragile piezo disks for piezo 20). Install and forget.

con's:

1. Price, but you get so much better product!
2. Very minor issue - the VR1 is at the bottom of the board when mounted and you have to lift you hot end assembly enough to make clearance for the screwdriver to fit comfortably between the carriage and the bed. Good news is you have to do it only ones, or at least not very often i guess....

Edited 1 time(s). Last edit at 06/22/2018 03:36AM by ValSimDim.
Re: Precision Piezo Z-probe Now available.
June 22, 2018 05:05AM
Glad it's working well for you now and thank you for the great review.

With regard to the potentiometer being on the bottom, I've finally managed to find a supplier of through board adjustable pots and the next revision of Orion PCB will be adjustable from above.

Idris


{Precision Piezo} Accurate, repeatable, versatile z-probe plus piezo discs, endstop cables, pt100, 50w heaters.
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