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I could use some help

Scheduled Pinned Locked Moved
Duet Hardware and wiring
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  • ?
    A Former User @A Former User
    last edited by 28 Jun 2022, 02:14

    @fcwilt so the accuracy is 93.65%?

    undefined 1 Reply Last reply 28 Jun 2022, 02:24 Reply Quote 0
    • undefined
      fcwilt @A Former User
      last edited by fcwilt 28 Jun 2022, 02:24

      @mac said in I could use some help:

      @fcwilt so the accuracy is 93.65%?

      That is rather strange. I expected a completely different outcome.

      It should have moved very close to 50mm.

      To compute the correct value in M92 for the Y stepper we just determine the ratio of the correct distance to the actual distance - 50.00 / 46.82 which is 1.0679.

      The current value in M92 is 80? or was it 40?

      In any case you take the current value and multiply by 1.0679.

      80 x 1.0679 = 85.433

      40 x 1.0679 = 42.716

      But those values make no sense to me at all. Every printer I have built has had simple integer values in M92.

      So take whatever the current M92 value for Y is and multiply by 1.0679 and use that new value in the M92.

      Re-boot and re-test the Y movement and see if it comes out very close to 50.00.

      I need to think about how these values might make sense.

      Frederick

      Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

      ? 1 Reply Last reply 28 Jun 2022, 02:29 Reply Quote 0
      • ?
        A Former User @fcwilt
        last edited by 28 Jun 2022, 02:29

        @fcwilt I’ll do it right now.

        undefined 1 Reply Last reply 28 Jun 2022, 02:30 Reply Quote 0
        • undefined
          fcwilt @A Former User
          last edited by 28 Jun 2022, 02:30

          @mac said in I could use some help:

          @fcwilt I’ll do it right now.

          That would be grand. I've got quite a bit of time at the moment to work with you.

          Frederick

          Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

          ? 1 Reply Last reply 28 Jun 2022, 02:33 Reply Quote 0
          • ?
            A Former User @fcwilt
            last edited by 28 Jun 2022, 02:33

            @fcwilt well, here's the first problem, and I remember changing this to half of these numbers:

            M92 X80.00 Y80.00 Z4000.00 E420.00

            undefined 1 Reply Last reply 28 Jun 2022, 02:36 Reply Quote 0
            • undefined
              fcwilt @A Former User
              last edited by 28 Jun 2022, 02:36

              @mac said in I could use some help:

              @fcwilt well, here's the first problem, and I remember changing this to half of these numbers:

              M92 X80.00 Y80.00 Z4000.00 E420.00

              All that matters is what they are now in the config.g file because those are the values that you have been using everything you have re-booted the printer.

              If what is there now for Y now is 80 then just replace the 80 with 85.433, re-boot and re-test Y movement.

              Thanks.

              Frederick

              Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

              ? 1 Reply Last reply 28 Jun 2022, 02:51 Reply Quote 0
              • ?
                A Former User @fcwilt
                last edited by A Former User 28 Jun 2022, 02:51

                @fcwilt I'm been redoing the measurement to see if it's the same each time. I'm more comfortable with 1.5625 inches, which is 39.6875 mm.

                50 divided by 39.6875 is 1.2598.
                80 times 1.2598 is 100.784.

                That sounds like 100 to me.

                I think those are better numbers, don't you?

                undefined 1 Reply Last reply 28 Jun 2022, 02:56 Reply Quote 0
                • undefined
                  fcwilt @A Former User
                  last edited by fcwilt 28 Jun 2022, 02:56

                  @mac said in I could use some help:

                  @fcwilt I'm been redoing the measurement to see if it's the same each time. I'm more comfortable with 1.5625 inches, which is 39.6875 mm.

                  50 divided by 39.6875 is 1.2598.
                  80 times 1.2598 is 100.784.

                  I think those are better numbers, don't you?

                  Now that is starting to make sense. 100 is a value that is common in "printer land".

                  So assuming X and Y use the same hardware setup (belts, pulleys, etc) then you should enter 100 for X and Y.

                  I bet that will work out just fine.

                  Especially once we find the issue that is causing the X stepper to malfunction. Any evidence yet to indicate an intermittent wiring problem?

                  Oh yes. After you have 100 in place for Y, at least, re-boot and try homing Y and see if it triggers the Y endstop twice and returns to the center of the bed.

                  I have my fingers crossed.

                  Frederick

                  Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                  ? 1 Reply Last reply 28 Jun 2022, 02:58 Reply Quote 0
                  • ?
                    A Former User @fcwilt
                    last edited by 28 Jun 2022, 02:58

                    @fcwilt Okay, I'm going to change X and Y to 100.00 each. Save, reboot, and then Home Y.

                    undefined 1 Reply Last reply 28 Jun 2022, 02:59 Reply Quote 0
                    • undefined
                      fcwilt @A Former User
                      last edited by 28 Jun 2022, 02:59

                      @mac said in I could use some help:

                      @fcwilt Okay, I'm going to change X and Y to 100.00 each. Save, reboot, and then Home Y.

                      Fingers still crossed.

                      Frederick

                      Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                      ? 1 Reply Last reply 28 Jun 2022, 03:03 Reply Quote 0
                      • ?
                        A Former User @fcwilt
                        last edited by 28 Jun 2022, 03:03

                        @fcwilt Okay, Y started out very slowly, and went towards HOME (the rear of the printer), but stopped 89mm from the end-stop.

                        I'm sorry, Frederick, it's just not happening.

                        undefined 1 Reply Last reply 28 Jun 2022, 03:04 Reply Quote 0
                        • undefined
                          fcwilt @A Former User
                          last edited by 28 Jun 2022, 03:04

                          @mac said in I could use some help:

                          @fcwilt Okay, Y started out very slowly, and went towards HOME (the rear of the printer), but stopped 89mm from the end-stop.

                          I'm sorry, Frederick, it's just not happening.

                          And yet jogging Y is now yielding correct distances?

                          Frederick

                          Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                          ? 1 Reply Last reply 28 Jun 2022, 03:05 Reply Quote 0
                          • ?
                            A Former User @fcwilt
                            last edited by 28 Jun 2022, 03:05

                            @fcwilt The nozzle is 51mm west of the front of the bed (the back of the printer is pointed west).

                            ? undefined 2 Replies Last reply 28 Jun 2022, 03:06 Reply Quote 0
                            • ?
                              A Former User @A Former User
                              last edited by 28 Jun 2022, 03:06

                              @fcwilt I haven't tried to find that out yet. I'll do that now.

                              1 Reply Last reply Reply Quote 0
                              • undefined
                                fcwilt @A Former User
                                last edited by 28 Jun 2022, 03:07

                                @mac said in I could use some help:

                                @fcwilt The nozzle is 51mm west of the front of the bed (the back of the printer is pointed west).

                                OK back to my previous question.

                                With the new value of 100 are Y movements done via jogging moving the correct distances?

                                Frederick

                                Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                                ? 1 Reply Last reply 28 Jun 2022, 03:10 Reply Quote 0
                                • ?
                                  A Former User @fcwilt
                                  last edited by 28 Jun 2022, 03:10

                                  @fcwilt I have an American tape measure going from the front of the printer to the back rail, where it's hooked on to the back rail. What I'm doing is bringing the adjustment wheel for the left corner of the bed to 10 inches. I just watched the bed move from 10 inches to 12 inches twice. So the bed travelled back and forth 51mm twice.

                                  ? undefined 2 Replies Last reply 28 Jun 2022, 03:11 Reply Quote 0
                                  • ?
                                    A Former User @A Former User
                                    last edited by 28 Jun 2022, 03:11

                                    @fcwilt they appear to be consistent.

                                    ? undefined 2 Replies Last reply 28 Jun 2022, 03:13 Reply Quote 0
                                    • ?
                                      A Former User @A Former User
                                      last edited by 28 Jun 2022, 03:13

                                      @fcwilt okay, I did a test. I clicked on Y-50 twice. That took the rear of the bed to the endstop (it hit it, versus touching it and backing away).

                                      undefined 1 Reply Last reply 28 Jun 2022, 03:16 Reply Quote 0
                                      • undefined
                                        fcwilt @A Former User
                                        last edited by 28 Jun 2022, 03:13

                                        @mac said in I could use some help:

                                        @fcwilt I have an American tape measure going from the front of the printer to the back rail, where it's hooked on to the back rail. What I'm doing is bringing the adjustment wheel for the left corner of the bed to 10 inches. I just watched the bed move from 10 inches to 12 inches twice. So the bed travelled back and forth 51mm twice.

                                        I don't care about homing Y right now because we know it is not working.

                                        I need to be sure that Y movements done via jogging are now moving the correct distances.

                                        Once that is assured the next step will be to determine if the current min/max limits for the Y axis are correct.

                                        Why? Because I based my Y homing code on them. If they are wrong the homing code is wrong and will not work.

                                        Frederick

                                        Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                                        ? 1 Reply Last reply 28 Jun 2022, 03:14 Reply Quote 0
                                        • undefined
                                          fcwilt @A Former User
                                          last edited by 28 Jun 2022, 03:14

                                          @mac said in I could use some help:

                                          @fcwilt they appear to be consistent.

                                          What appear to be consistent?

                                          Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                                          1 Reply Last reply Reply Quote 0
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