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Piezo20 probe and piezo kit now available

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  • undefined
    DjDemonD
    last edited by 3 Mar 2017, 19:50

    Do you mean it's 3.5mm difference between ID and OD?

    Simon. Precision Piezo Z-Probe Technology
    www.precisionpiezo.co.uk
    PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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    • undefined
      kraegar
      last edited by 3 Mar 2017, 20:26

      Yes.

      Co-Creator of the RailcoreII CoreXY printer
      https://www.thingiverse.com/thing:2407174

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      • undefined
        Moriquendi
        last edited by 3 Mar 2017, 20:41

        I think you may be running into the same problem DjDemonD had in the beginning. Looking at your effector it doesn't like you're controlling lateral movement of the hot end. DjDemonD had to add sliders to allow vertical movement of the hot end while preventing lateral movement causing triggering.

        Idris

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        • undefined
          kraegar
          last edited by 3 Mar 2017, 20:52

          The Slot for the hotend does actually by design have the hotend groovemount on an E3D "drop down" a bit into the mount. If anything it might be a little too snug of a fit. That's what I was hoping would make this ideal.

          How tight do you push down on the piezo? Just do it's held flush against the hotend, or do you flex the piezo some (in a "resting" state)

          Co-Creator of the RailcoreII CoreXY printer
          https://www.thingiverse.com/thing:2407174

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          • undefined
            DjDemonD
            last edited by 3 Mar 2017, 21:00 3 Mar 2017, 20:59

            It can be preloaded a small amount, as long as further upward pressure will bend it more, we're only talking 0.1mm more. Its the rate of bend that generates the signal rather than the absolute amount.

            Simon. Precision Piezo Z-Probe Technology
            www.precisionpiezo.co.uk
            PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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            • undefined
              kraegar
              last edited by 3 Mar 2017, 21:19

              Ok, back in business.

              I think my piezo was grounding the brass plate against my hotend mount. Maybe. I trimmed a spot in it around each screw, to be sure it wouldn't make contact. I also went back to the piezo I got the best luck out of… don't think I actually damaged it. I'm using a P1 probe type with a low trigger value. Seems to be working at the moment, anyway.

              I think drilling these without damage is going to be the challenging part, at least at first.

              Co-Creator of the RailcoreII CoreXY printer
              https://www.thingiverse.com/thing:2407174

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              • undefined
                kraegar
                last edited by 3 Mar 2017, 22:47 3 Mar 2017, 21:43

                My repeatability testing is now underway. If you have suggestions on the methodology or ways to display the data, let me know and I'll adjust: https://docs.google.com/spreadsheets/d/1EwNdSNXZR_OhwChLFrTYqFDFcKjB-4z6OwGkocKgW7E/edit#gid=0

                Currently I'm just moving to Z5 and doing a G30 s-1 50 times. I have the min, max, average, and stddev at the bottom.

                Edit to note I'm powering off and doing a full delta calibration between each set.

                Co-Creator of the RailcoreII CoreXY printer
                https://www.thingiverse.com/thing:2407174

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                • undefined
                  DjDemonD
                  last edited by 3 Apr 2017, 07:30 3 Mar 2017, 22:41

                  Thats good data. When I had a piezo in a machine running marlin I did the M48 repeatability test a few times and came up with similar results.

                  Recv: Mean: -2.492500 Min: -2.510 Max: -2.475 Range: 0.035
                  Recv: Standard Deviation: 0.009014

                  Not quite as good, but the hastily rigged carriage this machine uses is quite wobbly itself.

                  I've mainly been using my delta autocalibration deviation as the metric, which is, I accept, flawed as there are many other factors feeding into this.

                  Simon. Precision Piezo Z-Probe Technology
                  www.precisionpiezo.co.uk
                  PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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                  • undefined
                    kraegar
                    last edited by 3 Mar 2017, 22:49

                    My delta calibration leaves a bit to be desired still. Just working on the probe for now.

                    Calibrated 6 factors using 16 points, deviation before 0.055 after 0.054

                    I still have some work to do in solving an oddity I've talked to dc42 off and on about, to get that down. Having more accurate probing (and using the nozzle) should hopefully help that.

                    Co-Creator of the RailcoreII CoreXY printer
                    https://www.thingiverse.com/thing:2407174

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                    • undefined
                      DjDemonD
                      last edited by 3 Apr 2017, 15:21 4 Mar 2017, 14:57

                      Started a listing as a repository of 20mm versions which are currently in alpha testing.

                      http://www.thingiverse.com/thing:2152709

                      Feel free to try/mod one, its a basic module at the moment for integration into where-ever you need it. Not fully tested but the module does trigger the signal conditioning board when tapped so I am assuming it will be basically functional.

                      Very small, no rods/pins you need signal board, and 6x20mm m3 bolts and 6xm3 nuts and a 20mm piezo with 5mm hole drilled into it. I put a drilling template on there too.

                      Please feedback if you make/test one I haven't really a suitable machine to test this properly. I will be putting a version up later today which fits into a titan extruder.

                      Simon. Precision Piezo Z-Probe Technology
                      www.precisionpiezo.co.uk
                      PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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                      • undefined
                        Moriquendi
                        last edited by 4 Mar 2017, 17:18

                        @T3P3Tony:

                        Could you post your repeatability figures if you captured them?

                        If it's of any interest, I just probed my bed 89 times and had the exact same reading every time, to four decimal places, 232 steps and 2.9000mm

                        Idris

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                        • undefined
                          T3P3Tony administrators
                          last edited by 4 Mar 2017, 17:46

                          Thanks Iris that's a very encouraging result!

                          www.duet3d.com

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                          • undefined
                            Moriquendi
                            last edited by 4 Mar 2017, 17:54

                            That's with underbed sensors however.

                            Idris

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                              Dougal1957
                              last edited by 4 Mar 2017, 17:59

                              Idris could you share your underbed mount designs please I may give that method a try on my existing Delta but I suspect I may need to adjust the sizes etc so raw files as well as the STL's would be appreciated

                              Also do you use it with your 3 port board or with individual ones?

                              Doug

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                                kraegar
                                last edited by 4 Mar 2017, 18:09

                                Idris - is that a cartesian, or a delta? I suspect play in my belts, etc between the 3 towers factors in. Less moving factors on a cartesian if you're just moving Z. However, if those results are on a delta, I'm impressed, and probably have more work to do!

                                Co-Creator of the RailcoreII CoreXY printer
                                https://www.thingiverse.com/thing:2407174

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                                • undefined
                                  Dougal1957
                                  last edited by 4 Mar 2017, 18:14

                                  It is on a delta I have seen the pics

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                                  • undefined
                                    Moriquendi
                                    last edited by 4 Mar 2017, 18:44

                                    It's a kossel mini, originally a T3P3 kit but I think only the vertices and extrusions are original now.

                                    The heated bed is supported on three of these, printed in ABS.

                                    I'm looking at alternatives to the printed support, the ABS is not holding up to the temperature in the long run and the tops of the posts are starting to deform.

                                    I'm happy to post .stl or .step files but unless your printer is identical to mine the mounting holes will not line up with your heated bed. You're better off modelling your own.

                                    The three piezo disks are wired in parallel to the single input of a V1.0 board.

                                    Idris

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                                    • undefined
                                      Dougal1957
                                      last edited by 4 Mar 2017, 19:01

                                      Yes but the Step files will give me an idea of how you have mounted everything.

                                      I am tempted to do something and get them CNC'd in Alluminium (I am thinking of purchasing a smal Mill in the next few weeks and the CNC version is not to much more than the Manual one tho it comes without a controller or software but I already have all of that)

                                      So if you could post the files it would be appreciated and Maybe when I get set up I could do you a set of yours in Ally?

                                      Doug

                                      (A bit of Payback lol)

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                                      • undefined
                                        Moriquendi
                                        last edited by 4 Mar 2017, 19:15

                                        I've emailed you the file.

                                        Idris

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                                          Dougal1957
                                          last edited by 4 Mar 2017, 20:03

                                          Thanks Idris I'll see what I can do with it

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