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Question Too much lash on motor shaft ?

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Arazok, Apr 9, 2019.

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  1. Arazok

    Arazok Member

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    Hi,
    I am really satisfied with my build, see https://www.xsimulator.net/community/threads/2dof-for-existing-diy-playseat.11827/page-2#post-176347
    Makes a lot of fun !

    I am using the pgsaw motors (1:25) and carrying a 100kg person - not me ;-) - seems to be no problem.
    But the motor shaft has some lash. See a video here:



    Is this normal for such motors ?
    Is there any chance to improve it ?

    cheers,
    Arazok
    Arazok, Apr 9, 2019
    #1
  2. adgun

    adgun Active Member

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    All wormgears have backlash some more than others
    adgun, Apr 9, 2019
    #2
  3. bixler13

    bixler13 Member

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    I have the same problem with my setup. I fixed it by using bungee cords to keep pressure on the levers at all times in order to keep them on one side of the backlash.
    bixler13, Apr 12, 2019
    #3
  4. Arazok

    Arazok Member

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    Can you make a photo ?

    Would be good to see your solution.
    Arazok, Apr 12, 2019
    #4
  5. bixler13

    bixler13 Member

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    You can see the bungee cords in the following picture. They simply pull the back end of the seat down which in turn keeps pressure on the levers and keeps them on one end of the backlash.

    55932372_346634659527952_1491920966882689024_n.jpg
    • Like Like x 1
    bixler13, Apr 13, 2019
    #5
  6. Marc Lindgren

    Marc Lindgren New Member

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    Backlash is experienced when the motor changes direction, so I'm not understanding how this would help that. Could you explain?
    Marc Lindgren, Apr 22, 2019
    #6
  7. yellofella

    yellofella Member

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    by adding bungee cords to pull down and stop backlash you add to the amount of torque needed to lift the rear of the sim. surely the weight of a person sitting on the sim is enough to keep the backlash to a minimum like the bungees do with out adding to the torque needed to turn the motor. all wormgear motors have some backlash or they would be so tight they would wear the gears super quick or a tiny amount of debris would jam the gears and stop the motor. just my opinion but hope it helps
    yellofella, Apr 22, 2019
    #7