I have a 3DOF platform that I'm trying to make more stable. It's difficult to explain in words what the issue is so I've added a GIF below.

enter image description here

Any ideas of how I can get rid of this wobble? The DOF arm tends to cave inwards. I know it's being caused by the very small gap between the screw and the channel but is there any way to prevent this? Since the servo's I'm using don't have a dual shaft going through and through I can't modify the servo arm to be a inverted-U attached on both ends of the servo.

  • $\begingroup$ Build to smaller tolerances and if that does not work, change the design. $\endgroup$
    – Solar Mike
    Commented Aug 5, 2018 at 2:59
  • $\begingroup$ I second @SolarMike’s comment. You could purchase different shim stock sizes and cut a very small piece to fill the space between the two parts, but that’s only a band-aid. $\endgroup$
    – GisMofx
    Commented Aug 5, 2018 at 13:14
  • $\begingroup$ Fill up the play with e.g. CA glue? $\endgroup$ Commented Jan 7, 2021 at 7:52

1 Answer 1


If I understand your design correctly you extend the existing play in the mechanism.

If you can’t eliminate the play then you can try to minimise it. See the locking pliers (https://en.wikipedia.org/wiki/Locking_pliers) as an example to reduce the play. The disadvantage of this principe is the distance decrease.


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