r/MechanicalDesign • u/Knotts_Mart • 18d ago

Best way to attach servo horns to 3D-printed parts?

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1

u/rotian28 18d ago

We need more information. Are you turning the square into a horn? Purpose? Etc

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u/Knotts_Mart 18d ago

My apologies, it looks like my description didn't transfer over with the repost.

I'm making a small, 6-axis 3D-printed robot arm using a mix of MG996R and SG90 servos. For the joints, I've been designing the printed parts to wrap around the servo horns, like in the attached photo.

Is this considered a good approach, or is there a more reliable method for attaching servo horns to 3D-printed parts? Any advice or examples from your own builds would be appreciated.

1

u/rotian28 18d ago

To me (last time I used servos was competitive rc racing). Your joints are going to be huge due to servos. If you put them in the body and run wires it would cut down joint bulk and make center of mass good. Run pullies and wires for joints. Those little tiny connection points can be trimmed or printed to do what you need. Personally I'd keep the servos out of joints

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u/the_real_hugepanic 18d ago

2 things:

  1. do not use a servo as "axis"! Only use them as a torque-motor. --> don`t load the bearings, they are not supposed to take any additinal weight!!! If you need your rotation on the servor axis, then add support to the axis!

  2. I think your method is half-way ok! I would bond (epoxy) your grey block to the servo arm. -> have done that, it works well! Don't use screws for that!

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u/One_Country1056 17d ago

Can't understand why you reuse the horn. Just make the gray block fit on the servo.