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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.
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