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Precision Piezo Andromeda

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  • undefined
    Moriquendi
    last edited by 6 Nov 2018, 15:43

    The PCB itself is roughly 1.7mm thick but where the connector is soldered on is 5.5mm thick.

    Yes they should be wired in parallel, there's another set of holes opposite the connector so they could be daisychained if needed.

    The centre hole is 3.2mm just like the others.

    Idris

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    • undefined
      garyd9 @SupraGuy
      last edited by 6 Nov 2018, 16:16

      @supraguy said in Precision Piezo Andromeda:

      I have these, I am using 4 of them for under-bed sensing.
      ...
      the thumbwheels hold a captive nut and fit snugly between the aluminum square tube and the Andromeda board. The square tube is mounted firmly to the bed carriage with the heated bed screws going through the tube and thumbwheels.

      I'm having a hard time visualizing what you described. Can you please post a picture showing the piezo board mounted and everything attached?

      Thank you
      Gary

      "I'm not saying that you are wrong - I'm just trying to fit it into my real world simulated experience."

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      • undefined
        SupraGuy
        last edited by SupraGuy 11 Jun 2018, 17:52 6 Nov 2018, 17:43

        0_1541525784751_Andromeda.png
        I don't have a photo installed, but this is a Tinkercad rendering of the mount. (I'm at work at the moment, and can't just snap one.)

        I used 10mm stand-offs instead of the orange spacers for the actual production, and the square tube is screwed to the Y axis plate
        0_1541526025804_Andromeda_exploded.png
        Maybe the exploded view will be a bit clearer. Because the thumbwheel is the same height as the stand-offs, it fits snugly between the Andromeda board and the aluminum tube, with no space to move. this holds the build plate stable in height and allows it to transmit any force on the build plat down to the Andromeda board for sensing.

        Edit: Note that I did not render the threads on the bed screws, nor the screws holding the Andromeda through the spacers to the aluminum tube. Sorry, this was more for my own use than to post for others.

        Lead screw driven printer, powered by Duet 2 Wifi
        MPCNC powered by Duet 2 Wifi
        CoreXY printer driven by Duet 3 6HC
        LowRider CNC powered by Duet 2 Wifi

        undefined 1 Reply Last reply 6 Nov 2018, 18:44 Reply Quote 1
        • undefined
          garyd9 @SupraGuy
          last edited by 6 Nov 2018, 18:44

          @supraguy Thank you. This was exactly what I needed to understand. However, I hope you understand that the lack of thread rendering leaves me wondering exactly what thread spacing was used. (I'm kidding. Please don't waste time answering.)

          Based on this, I'm guessing that your bed doesn't move, or at least doesn't move in the Z axis?

          "I'm not saying that you are wrong - I'm just trying to fit it into my real world simulated experience."

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          • undefined
            SupraGuy
            last edited by 6 Nov 2018, 18:59

            Heh. Standard 3mm thread.

            My bed moves on the Y axis, parallel to the aluminum bar.

            If I'd designed the printer for this in the first place, I wouldn't need the aluminum bar, the standoffs for the Andromeda boards would simply mount directly to the acrylic frame instead, but since that frame doesn't extend much past the build platform mounting screws by anything even close to the requisite 20mm, this was done to add in the needed stiffened mounting.

            Lead screw driven printer, powered by Duet 2 Wifi
            MPCNC powered by Duet 2 Wifi
            CoreXY printer driven by Duet 3 6HC
            LowRider CNC powered by Duet 2 Wifi

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            • undefined
              mikebridge
              last edited by 22 Nov 2018, 06:06

              how would the second from the right actually trigger when pressure was put on the plate? the sensor would 'unflex'?

              375x360x415 CoreXY DuetWifi + Duex5
              24v 600w, E3D Chimera, Zesty Nimble CC, BLTouch, X&Y linear rails, dual Z motors

              undefined 1 Reply Last reply 22 Nov 2018, 09:13 Reply Quote 0
              • undefined
                Moriquendi @mikebridge
                last edited by 22 Nov 2018, 09:13

                @mikebridge The sensor responds to changes in pressure rather than total pressure. It makes no difference whether the change in pressure is positive or negative except that the polarity of the signal is inverted so you plug the Andromeda in the other way around.

                Idris

                undefined 1 Reply Last reply 23 Nov 2018, 04:38 Reply Quote 0
                • undefined
                  SupraGuy
                  last edited by 22 Nov 2018, 15:29

                  Or flip the board over. So long as the wingnut isn't shorting out circuitry, that is.

                  Lead screw driven printer, powered by Duet 2 Wifi
                  MPCNC powered by Duet 2 Wifi
                  CoreXY printer driven by Duet 3 6HC
                  LowRider CNC powered by Duet 2 Wifi

                  undefined 1 Reply Last reply 22 Nov 2018, 15:35 Reply Quote 0
                  • undefined
                    Moriquendi @SupraGuy
                    last edited by 22 Nov 2018, 15:35

                    @supraguy Oh yeah... that's a much better idea 👍

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                    • undefined
                      mikebridge @Moriquendi
                      last edited by 23 Nov 2018, 04:38

                      @moriquendi phenomenal. How do they deal with low temperatures? Moved my coreXY into the garage to start getting the baby's future room ready and dc42's IR probe doesn't seem to like the near freezing temperatures with the PEI surface.

                      375x360x415 CoreXY DuetWifi + Duex5
                      24v 600w, E3D Chimera, Zesty Nimble CC, BLTouch, X&Y linear rails, dual Z motors

                      undefined ? undefined 3 Replies Last reply 23 Nov 2018, 09:39 Reply Quote 0
                      • undefined
                        dc42 administrators @mikebridge
                        last edited by dc42 23 Nov 2018, 09:39

                        @mikebridge said in Precision Piezo Andromeda:

                        ...dc42's IR probe doesn't seem to like the near freezing temperatures with the PEI surface

                        That's probably because you are getting condensation on the surface, coupled with the fact that PEI is transparent to IR. Wiping the surface first to remove condensation may help. However, a piezo offers potentially better probing accuracy then the IR sensor can give using PEI as the target.

                        Duet WiFi hardware designer and firmware engineer
                        Please do not ask me for Duet support via PM or email, use the forum
                        http://www.escher3d.com, https://miscsolutions.wordpress.com

                        undefined 1 Reply Last reply 21 Dec 2018, 15:33 Reply Quote 0
                        • ?
                          A Former User @mikebridge
                          last edited by 23 Nov 2018, 10:35

                          @mikebridge said in Precision Piezo Andromeda:

                          @moriquendi phenomenal. How do they deal with low temperatures? Moved my coreXY into the garage to start getting the baby's future room ready and dc42's IR probe doesn't seem to like the near freezing temperatures with the PEI surface.

                          Sorry I cant resist, If I ever needed a reminder why i have a cat this is it.... good luck with the printer in the cold environment, maybe a heater will help.

                          undefined 1 Reply Last reply 23 Nov 2018, 13:58 Reply Quote 0
                          • undefined
                            mikebridge @A Former User
                            last edited by 23 Nov 2018, 13:58

                            @calvinx oh, we have cats too (thus why all our 3d printers have enclosures), and I told my wife I have a rule of "we can't have more pets than persons living in the house", but she's pregnant now, so we're up to 3 cats and she keeps mentioning wanting a dog too...

                            @dc42 it was triggering fine against the PEI indoors (the back of the PEI is painted w/ high-temp black paint), and there's no noticeable condensation on the surface, similar error when the bed is cold or hot. perhaps something shifted when it was moved to the garage, I'll check that today.

                            375x360x415 CoreXY DuetWifi + Duex5
                            24v 600w, E3D Chimera, Zesty Nimble CC, BLTouch, X&Y linear rails, dual Z motors

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                            • undefined
                              Moriquendi @mikebridge
                              last edited by 23 Nov 2018, 15:29

                              @mikebridge

                              Piezo sensors have no issues with the kind of temperatures you're likely to encounter in a garage. What you do have to be aware of is that the responsiveness does change with temperature. If you tune the system when everything's cold and then probe when it's been sitting with a hot bed for long enough for for the piezos to warm up you may see different results.

                              Idris

                              PS, Dogs are persons, just FYI.

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                              • undefined
                                SupraGuy
                                last edited by 23 Nov 2018, 15:54

                                My experience is this:

                                The piezo sensors like consistent temperatures. A change of more than about 10 deg C up or down will change how the system responds. It's getting cold here, and with the drop in temperature, I find that I need to use a space heater to keep the temperature around the printer more consistent in order not to need to make adjustments, which I'd rather avoid. My printer is in the attic, and in the summer, it's mid to upper 20s up there. In the winter, it's in the middle teens, and my last print I had my first false trigger with the Andromeda. I turned on a space heater and re-started everything when it got to 22 degrees up there, and everything was great. I assume that I could have readjusted the trigger threshhold on the board, but I want to avoid making those adjustments if at all possible. Besides, cooler air temperatures are likely to change the printing characteristics of the extruded plastic, too, so keeping a consistent temperature for use is a good thing.

                                If your printer is enclosed, and you are keeping a consistent temperature for printing anyway, I can say that I have noticed no ill effects from the Andromeda boards being stored in low temperatures, but I think the coldest that I might have tried to use it would be maybe 14°C

                                Lead screw driven printer, powered by Duet 2 Wifi
                                MPCNC powered by Duet 2 Wifi
                                CoreXY printer driven by Duet 3 6HC
                                LowRider CNC powered by Duet 2 Wifi

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                                • undefined
                                  mikebridge @dc42
                                  last edited by 21 Dec 2018, 15:33

                                  @dc42 turns out the glass cracked under the PEI sheet and that was causing the inconsistent readings. replaced w/ a geckotek spring steel build plate (see my other thread on the high temp magnetic sheet if people want more info) and my readings are very consistent now.

                                  375x360x415 CoreXY DuetWifi + Duex5
                                  24v 600w, E3D Chimera, Zesty Nimble CC, BLTouch, X&Y linear rails, dual Z motors

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