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Acro 1510 drawbot - x-axis drift

Discussion in 'DrawBot' started by GrantS, May 30, 2021.

  1. GrantS

    GrantS New
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    Having some issues with x-axis drift on my Acro 1510 - converted to drawbot/pen plotter.

    When drawing close to the 0,0 origin point, calibration is fine. But the further from the origin point, the more the x-axis calibration goes out. y-axis seems fine anywhere within the frame, but x-axis drifts more the further to the left of the origin it gets.

    Have used calibration wizard multiple times, have replaced x-axis timing belt twice, have re-tightened wheels and pulleys on the x-axis gantry - same result each time - with subtle variation in the magnitude of the error. Initially was drawing with motor speed up very fast - so took it down a notch and now less noticeable but still a big error occurring.

    Below showing a 10x10cm test grid - drawn near the starting corner, and another drawn far to the left of origin.

    Any suggestions welcome.

    [​IMG]
    imgur.com

    [​IMG]
    imgur.com
     
  2. GrantS

    GrantS New
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    **RESOLVED**

    Letting people know in case it helps anyone else - haven't seen this exact issue on the forums before.

    Turns out the pulley on the Y2 motor was a tiny bit larger than the pulley on the Y1 motor. I used the pulleys that came with the kit - so assumed they were all the same - strange that they werent. Changed all the pulleys with ones I had lying around and knew were the same size and hey presto the drift is gone. The kit comes with 3 pulleys - X, Y1, Y2 - its possible the pulley for the X was the one that was different to the other two - but replacing all three fixed it anyway.

    Also helped that I broke my error testing down into very basic parts so I could test just one thing at a time. Rather than drawing a grid and trying to figure out what part of the machine was causing an error in the drawing - I just tried left-right, then back-forth, separately so it was easier to pinpoint what part of the machine was causing the error.
     
  3. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

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    From who did you buy this kit? Our kit comes with 3 of the same pulleys, so if one was different, you can ask the store to rectify any packing mistakes.
     

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