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    3 point leveling not cutting it in the first pass.

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    • Steve Lynchundefined
      Steve Lynch
      last edited by

      I was wondering.... my Railcores “true level” the bed in the first pass, and really don’t do much the 2 and third time around. I built this new machine for fun, as I wanted a ginormous corexy. It’s not totally done, as I didn’t have the 1/2” aluminum to mill my Carriage parts. I kind of appropriated the Railcore style for the Y carriage for now, but I designed a more rigid gantry using a 15mm linear guide. It’s a mosh mash if my FT-5 upgrade parts I designed a few years ago, a little Railcore, and a whole lot of last minute changes. 550mm of Mic6 goodness! I milled all the parts the other night.

      Anyhow, when I do a “true level”, , I have to throw a round bubble level in the bed to get it close before it’ll complete. Otherwise I get one corner that doesn’t trigger the BL touch. I assume this is just due to the fact that the bed is longer, so a variation in height compounds. But here’s the deal. When it levels, it’s still way off after the first adjustment. Then it gets better for the second, and pulls it flat on the third pass. Is that normal? Or should it try to fix it in the first pass?

      Either way, it works, but my correction is progressive, rather than immediate!

      Thanks guys!!!

      droftartsundefined dc42undefined 2 Replies Last reply Reply Quote 0
      • Phaedruxundefined
        Phaedrux Moderator
        last edited by

        For a large bed that is pretty normal I think.

        Z-Bot CoreXY Build | Thingiverse Profile

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        • droftartsundefined
          droftarts administrators @Steve Lynch
          last edited by droftarts

          @Steve-Lynch impossible to say without your config.g and firmware version. most likely either your leadscrew positions aren’t accurate in M671, or your probe isn’t set up correctly (offset or not repeatable accurate).

          Edit: do you get any error? Maybe it’s beyond the max deviation for bed levelling.

          Ian

          Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

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          • Steve Lynchundefined
            Steve Lynch
            last edited by

            Thanks guys... I kind of figured it was just the size of the bed... 1 degree tilt on a 220mm bed is big... double that, and I guess you're right... it's exceeding the max correction value... raising that value almost always leads to a bed crash. I've learned that.. Nothing I can't live with... I just wondered if I needed to set up the maths or something.

            I appreciate the reply!

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            • Szwalkiewiczundefined
              Szwalkiewicz
              last edited by

              I'm kind of new to duet but at the top of the bed.g after the G28 but before the leadscrew G30's a you could add a m558 with a larger (H) dive height and then after the G30's but before the G29 change the m558 back to what you have in the config.g
              then the m671 larger S parameter will work?

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              • dc42undefined
                dc42 administrators @Steve Lynch
                last edited by

                @Steve-Lynch said in 3 point leveling not cutting it in the first pass.:

                Anyhow, when I do a “true level”, , I have to throw a round bubble level in the bed to get it close before it’ll complete. Otherwise I get one corner that doesn’t trigger the BL touch.

                Increase the dive height, that's the M558 H parameter.

                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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