Precision Piezo z probes guide for duet users reference
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See item #1 in the FAQ page on the Duet3d wiki.
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I have a concept i would like to test including piezo. I have bought a set for my extruder assembly but had difficulties mounting it and i scrapped that idea and using prusas induction probe ever since. Resolution is very good and i am happy with it. That being said i have thought of a concept that i would like to validate with you clever people.
i have large cartesian printer based on CR10S4 frame. As i have piezo "in stock" i would like to try and use it as tool offset. Mainly the idea came from thinking about e3d tool changer.
I want to mount piezo disc on the frame beside the bed. i will know piezo Z offset from the bed which will be constant. If i can have duet and piezo cooperate so the Gcode would move my nozzle off the bed where piezo disc is located and touch it to record Z offset then go about the routine of mesh mapping with induction probe.
This would eliminate the need to fiddle with Z offset all together, when you change the nozzle, clean a clog or do maintenance.
Any outside pointers on this?
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I don't see any reason why this wouldn't work, others are working on a similar idea using the new M585 command.
Idris
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@moriquendi said in Precision Piezo z probes guide for duet users reference:
I don't see any reason why this wouldn't work, others are working on a similar idea using the new M585 command.
Idris
Can you point me to those workings?
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@agniusm I can't I'm afraid, he's not published it yet so it's not on a forum. No doubt when it's ready I'll be able to link to it.
Idris
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Maybe I missed something in my M558 setup but I can't seem to get analog to work on the Orion? Does the Orion have an analog signal? I've watched DWC while moving/probing and its either at 0 (red light) or 1000 (blue light), I don't see any numbers in between.
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@tjb1 The Orions output is strictly digital, you will only ever see 0 or 1000 unless there is noise on the signal wire.
Idris
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@ajcraig99 Sir. Did you get it working?
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What I have to do if I want to reset a piezo 20 to factory value?
I have doubt that it is broken.
Other questions, if I use P1 in M558 so I can change sensitivity on the fly, the P in the g31 is useless? -
Which version of the Piezo20 do you have, there is a version number on the back, underneath the piezo connections pins.
You cannot change the sensitivity using P1, the output of the module is digital, it's either on or off. The only way to adjust the sensitivity is with the potentiometer/s on the board.
Idris
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@moriquendi said in Precision Piezo z probes guide for duet users reference:
Which version of the Piezo20 do you have, there is a version number on the back, underneath the piezo connections pins.
I have the piezo20 v0.6
@moriquendi said in Precision Piezo z probes guide for duet users reference:
You cannot change the sensitivity using P1, the output of the module is digital, it's either on or off. The only way to adjust the sensitivity is with the potentiometer/s on the board.
Idris
Sorry Idris i badly explained myself, i meant that if i use P1 instead of P5 or P8 for example:
M558 P1 I0 R0.4 F330
G31 X0 Y0 Z-0.1 P100Than i can use VR1 on piezo PCB to adjust the sensitivity on the fly but the threshold P100 in the G31 is useless or it is still used?
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To reset the v0.6 to factory settings, turn VR1 and VR2 so that the flat part of the adjuster is closets to the bottom of the PCB.
You CAN use P1 but it has no advantage over P5 or P8 and may have some disadvantages. The output of the PCB is either 0v (roughly) or 3.3v (again roughly, later boards are better at this, they go closer to 0v but for this explanation assume 0v). The duet reads these values as either 1000 or 0. Because the output is digital, the value is either 1000 or 0 but nothing else inbetween. So the threshold makes no difference except that noise or interference on the signal wire might cause a false trigger.
David might be able to give more detail about how the firmware processes P1 and P5/8 differently.
TLDR: use P8
Idris
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@moriquendi said in Precision Piezo z probes guide for duet users reference:
To reset the v0.6 to factory settings, turn VR1 and VR2 so that the flat part of the adjuster is closets to the bottom of the PCB.
Last question, clockwise or counterclockwise?
@moriquendi said in Precision Piezo z probes guide for duet users reference:
David might be able to give more detail about how the firmware processes P1 and P5/8 differently.
it isn't necessary, it was just a curiosity.
Thank you for your help Idris
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Either way, there are no physical stops.
Idris
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@moriquendi ...
Hi Idris!
I'm afraid that I seem to be having quite a lot of trouble with the new V2.75 board which I just received from you. I'm using an under-bed setup and had gotten it to work well, and fairly easily, with the V2.02 board -- but I wore out the pots on that one. Now I'm getting an insane level of false triggering which I seem unable to tune out. Might you by chance still have any V2.02 (or equiv) lying around?
I am wondering whether my trouble may merely be caused by the long (slightly over recommended) cables from the piezos, perhaps since in the current state of the build they're still just draped across other electronics under the bed -- but again, the same was true with the earlier board and no problems were evident. Might shielded cables resolve my issue? Having trouble locating stranded ones on Amazon.
I'm still stunned every time I look at your piezo endstop board, knowing that you soldered the entire thing by hand.
Michael
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Hi Michael
The v2.75 version of the universal PCB has two solder jumpers on the back, closing the two jumpers will allow you to use the full tuning range of the board.
As supplies the v2.75 board has the tuning window reduced, this makes it easier to tune because you need more rotation of the pot for the same change in tuning. For most people this is a good deal because most people don't need the full tuning range but for those who do it's just a matter of putting a blob of solder on each of the jumpers.
If you're looking for flexible, shielded cable you might try a headphone lead, they're often shielded.
I don't exactly solder them all by hand, I assemble them by hand and reflow them in an oven, I've got a video of the process here
Idris
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Thanks Idris ... yes I'd seen that idea in the manual, but had forgotten. I'll give it a shot!
And thanks for the tip on the cables. -
Wow fascinating video Idris! Thanks so much for taking the time to show us!
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Hi,
I have an under bed setup using 4 piezo on a universal board... until last night!
I have changed my extruder and new hotend is a mk10 from a mk8. I cannot see why this might make a difference but now my piezo setup won’t work!
Any suggestions please? Nothing else in my setup has changed... except the M92 E value for new extruder!
Now it still triggers as it did when tapping the bed, but nozzle just crashes when probing..
Many thanks,
Matt
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Installing a Orion Piezo on a cubex. The Z probe is always at 1000 with or without piezo connected to probe header. When connected and i touch the end of the hot end the blue light flashes and Z probe goes to zero. in this configuration I get a error that the Z home signal is on before homing starts. I'm configuring this thru the RepRap configuration software. I've also have left the configuration to z probe and then used a n/c switch but it start to home but i can't stop it. the blue led flashes when I tap the hot end but it doesn't stop. The following moves x,y to 25mm z retracts (30mm?) and then I get the error. Thank You for your help. I'm about as new as one can get to this.
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves; Network
M550 P"Cubex" ; Set machine name
M552 S1 ; Enable network
;*** Access point is configured manually via M587
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet; Drives
M569 P0 S0 ; Physical drive 0 goes backwards
M569 P1 S0 ; Physical drive 1 goes backwards
M569 P2 S1 ; Physical drive 2 goes forwards
M569 P3 S1 ; Physical drive 3 goes forwards
M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X80.00 Y80.00 Z4000.00 E420.00 ; Set steps per mm
M566 X900.00 Y900.00 Z12.00 E120.00 ; Set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00 ; Set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00 ; Set accelerations (mm/s^2)
M906 X800.00 Y800.00 Z800.00 E800.00 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout; Axis Limits
M208 X25 Y10 Z0 S1 ; Set axis minima
M208 X250 Y250 Z220 S0 ; Set axis maxima; Endstops
M574 X1 Y1 S0 ; Set active low and disabled endstops; Z-Probe
M574 Z1 S2 ; Set endstops controlled by probe
M558 P5 R0.4 H5 F1200 T6000 ; Set Z probe type to effector and the dive height + speeds
G31 P500 X0 Y0 Z2.5 ; Set Z probe trigger value, offset and trigger height
M557 X25:25 Y25:195 S20 ; Define mesh grid; Heaters
M140 H-1 ; Disable heated bed
M305 P1 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C; Fans
M106 P0 S1 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off; Tools
M563 P0 D0 H1 ; Define tool 0
G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C; Automatic power saving
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss; Custom settings are not configured
; homez.g
; called to home the Z axis
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; generated by RepRapFirmware Configuration Tool v2 on Tue May 21 2019 15:52:37 GMT-0400 (Eastern Daylight Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G90 ; absolute positioning
G1 X25 Y25 F6000 ; go to first probe point
G30 ; home Z by probing the bed; Uncomment the following lines to lift Z after probing
;G91 ; relative positioning
;G1 S2 Z5 F100 ; lift Z relative to current position
;G90 ; absolute positioning
