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Solved Z-axis lifting less than it should

Discussion in 'Troubleshooting' started by Bushwookie, Apr 10, 2016.

  1. Bushwookie

    Bushwookie New Member

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    Hello,

    I own a Robo3d R1, and I noticed that the Z-axis does not seem to lift nearly as much as it should when given commands.

    I recently replaced the ramps board, and re-flashed the software. everything else works perfectly fine, but the z-axis lifts very slowly, and when given a command to lift any amount, it lifts decidedly less. (ie 10mm command lifts it around 5mm, 100mm command lifts it maybe 40mm, etc). every other stepper motor works fine (x-axis, y-axis), and this issue seems to only have come up after the ramps installation. Any ideas on what is causing it? or better yet, how to fix it?

    Thank you,
    Bushwookie
     
    #1 Bushwookie, Apr 10, 2016
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    What exactly do you have?
    R1 (not an R1+) but what (if any) modifications?

    We need to figure that out to see if you loaded the correct firmware. Otherwise the Z steps could be incorrect. (which would make the Z axis work like you describe). The alternative is a bad stepper driver card (causing missed steps on the Z).
     
    #2 mark tomlinson, Apr 11, 2016
    danzca6 likes this.
  3. Bushwookie

    Bushwookie New Member

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    It is a completely stock R1 (not R1+) save for the following modifications:

    -New ramps 1.4 board (ordered through robo 3d)
    -New 0.25mm extruder nozzle (replacing the stock 0.4mm one

    Thank you for your time and assistance.
     
    #3 Bushwookie, Apr 11, 2016
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    OK, check your firmware. Should be this version:

    http://download.robo3d.com/firmware/R1/ROBO3DR1V3_06_11_2015.zip

    If you have the source already for what you have loaded look in configuration.h for this line:

    #define DEFAULT_AXIS_STEPS_PER_UNIT {80,80,2267.72,723.38} // default steps per unit for RoBo 3D R1

    Unless it is a really old R1 (some of the early ones had 5/16 rods like the beta instead of the 8mm rods they standardized on for the R1).

    The 2267.72 number is the important one (Z steps/mm)
     
    #4 mark tomlinson, Apr 11, 2016
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    If the firmware is correct then possibly a weak stepper driver for the Z axis. They can be tweaked/adjusted or replaced (they are pretty cheap). Check the firmware first.
     
    #5 mark tomlinson, Apr 11, 2016
  6. Bushwookie

    Bushwookie New Member

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    Thank you very much! that seems to have done the trick!
     
    #6 Bushwookie, Apr 11, 2016

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