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The problem of double/misaligned lines

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Laser
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02-20
I have an Algolaser DIY 20W and everything works normally. Recently, I bought a Delta 22W, and when performing the material test, I have this misalignment problem.
I have already tried tightening the belts and checking for vibrations, but nothing, absolutely nothing works.
Does anyone have any ideas on how to solve this?
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    • Jamie

      02-21
      Check the set screws on the pulley to stepper motor conection.
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      • Abel

        02-24
        It looks like backlash. Probably a belt issue.
You can test this pretty quickly, by turning bi-directional scan off. With it off, there shouldn’t be any visible backlash.
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        • David

          02-25
          A belt doesn’t move against anything else. It’s directly connected to a pulley. When the pulley moves, the belt moves.
Backlash is from threaded drive systems. If you put a nut on a bolt, there’s play between the nut threads and the bolt threads. If you tighten the bolt, the nut is pressed against one side of the bolt. reverse direction and the bolt will spin a little bit before it makes contact with the other side of the nut. That’s backlash. The amount of play before the nut actual moves. Belt drives have no backlash. Any “slop” would be the result of something loose.
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            • Smith

              : Belt drives don’t have any backlash.

            • Abel
              Reply
              @Smith

              : Can easily check it by turning off bi-directional.

            • Smith
              Reply
              @Abel

              : A belt doesn’t move against anything else. It’s directly connected to a pulley. When the pulley moves, the belt moves. Backlash is from threaded drive systems. If you put a nut on a bolt, there’s play between the nut threads and the bolt threads. If you tighten the bolt, the nut is pressed against one side of the bolt. reverse direction and the bolt will spin a little bit before it makes contact with the other side of the nut. That’s backlash. The amount of play before the nut actual moves. Belt drives have no backlash. Any “slop” would be the result of something loose.

          • Abel

            03-03
            If it’s a toothed belt, you can have the belt stretch as it’s coming into contact with the toothed pulley.
If you don’t want to call it backlash, I’m ok with that. In the end, it’s similar, at least.
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              • Smith

                : Just recently there was a post where the print was moving inches, literally inches, away and the first reply was “That’s called backlash.” Losing steps is not backlash. Bad USB comms is not backlash. While it may (will) result in backlash, the problem is using the wrong parts. Most CNC controllers have a “backlash compensation” setting that will “remove” backlash by moving the set amount more on reverse moves.

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