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    Delta FSR G32 Calibration Not Converging

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    • 4lathe
      4lathe last edited by

      I have an Ultibots D300vs delta with fsr’s. I recently put a magnetic base plate on it and have been facing difficulties with autocal. Doing say 5 or 6 g32’s, I get the After values between .020 and .022 but Before values between .40 and .44. So both Before and After converge but not to the same number. Does this provide a clue as to what might be wrong? Thx for any help.

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      • dc42
        dc42 administrators @4lathe last edited by

        That suggests inconsistent probe readings. I'm out of the office right now but I recall a couple of threads on this forum giving macro files to do probe repeatability tests. You could also look at the M558 options for probing each point more than once.

        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

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        • 4lathe
          4lathe last edited by

          I have my printed be set to .015 tolerance and up to 5 retries. I’ve done repeatability tests.
          The first pic is 2 g30 s-1 at each of 10 points.
          The second is multiple bed probes with s-1.
          The 3rd pic is multiple g32’s with no homing in between.
          0_1552097831703_5D26F98D-AF26-402C-AC44-1F71078E1A90.jpeg

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          • 4lathe
            4lathe last edited by

            0_1552098096772_8EA3A3CD-2B36-440C-AC83-73AC46E83C6D.jpeg 0_1552098052956_729EA469-7347-4850-80D8-2201EA1B998C.jpeg

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            • 4lathe
              4lathe last edited by

              Sorry to chime in again but I realized pic 2 and 3 are reversed from my description. The max deviation at a given point across the g30 s-1’s in pic 3 is .023 but most are much smaller. @dc42 I think I read anothe rpost of yours saying that with .9 steppers that I should be at .01 repeatability. Are the few that are over that a potential cause for the Before and After not converging with g32’s?

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              • 4lathe
                4lathe last edited by

                Tried more mechanics, new wheels and bearings, belts, tightened everything. This .02 tolerance on z probe with up to 3 tries at each point. No g28 between g32’s. Anyone have any ideas?
                0_1552336588726_D392E9B8-F716-41F6-B350-78A52129A693.jpeg

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                • Alexander Mundy
                  Alexander Mundy last edited by

                  How tight is the bed in the bed clamps? On my Ultibots K250 when I had FSR's there was a very narrow range of tightness that they worked good but didn't allow layer shift.

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                  • Alexander Mundy
                    Alexander Mundy last edited by

                    Also changed the jumpers on the board for full sensitivity

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                    • 4lathe
                      4lathe last edited by

                      I have printed different brackets than stock because of new magnetic bed. There is plenty of gap there. I never experience any layer shift. I’ve tried with sensitivity on the fsr’s all the way down to 25 and up to 500.
                      The After value always stabilizes but the Before cycles. It must have to do with the algorithm .

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                      • Alexander Mundy
                        Alexander Mundy last edited by

                        I went to look for the jumper settings I mentioned that affect sensitive and it appears the newer JohnSL boards don't have them.

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                        • 4lathe
                          4lathe last edited by

                          I think sensitivity is all in doftware now. I just replaced the fsr’s to see if that was it but still the same. I’m at wit’s end unless someone sees a pattern in these numbers that gives me a clue what to look for.

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                          • Alexander Mundy
                            Alexander Mundy last edited by

                            Are you sure the towers aren't out of alignment slightly?

                            4lathe 1 Reply Last reply Reply Quote 0
                            • 4lathe
                              4lathe @Alexander Mundy last edited by

                              Checked with machinist’s square.

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                              • dc42
                                dc42 administrators last edited by

                                If you calibrate a few times, then replace S6 by S-1 on the last G30 command in bed.g, then run the G32 several times again (it wont adjust the calibration, it will just print the errors), does it report consistent height errors?

                                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

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