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I’ve got a few servo motors MG995, MG996R, etc.

For my make I need a servo to have a longer shaft – 6cm or so.

I cannot find a way to achieve it. There is lots of Shaft Coupler for steppers and DC motors in the shop. But they don’t suite a servo motor shaft which is short.

Does anybody know how to solve this problem?

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  • $\begingroup$ I usually just glue some nylon tubing or something on the servo hub and trim off what I don't want with a rotary tool (or sometimes diagonal cutters when I'm feeling lazy). $\endgroup$
    – ScienceGeyser
    Feb 26, 2021 at 7:24
  • $\begingroup$ @ScienceGeyser Very interesting. Can you share some photo? $\endgroup$
    – zhekaus
    Feb 26, 2021 at 7:36
  • $\begingroup$ There are shaft couplers for RC servos also. Google image search for servo shaft coupler returns quite a few variants. $\endgroup$
    – 50k4
    Feb 26, 2021 at 8:36
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    $\begingroup$ I’m voting to close this question because it is a shopping list queston $\endgroup$
    – 50k4
    Feb 26, 2021 at 8:36
  • $\begingroup$ Welcome to Robotics zhekaus, but I'm afraid that shopping questions really aren't a good fit for a stack exchange site. We prefer practical, answerable questions based on actual problems that you face. Take a look at How to Ask and tour for more information on how stack exchange works, and the Robotics question checklist for details of how to write a good question. $\endgroup$
    – Ben ♦
    Mar 5, 2021 at 12:50

2 Answers 2

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This is something I used in a Lego assembly some time back. It's using an FS90 servo which is considerably smaller than the one you list, but You can get the picture. This version of gluing things on, allows some amount of disassembly and reuse. Other glue jobs are not equally as graceful.

To get the servo horn screw in, I had to knock off the corners of the shaft hole in the Lego piece that is glued to the horn. Then the next piece gives good engagement to the shaft.

Assembled Lego servo shaft adapter Parts Detail

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  • $\begingroup$ Very nice. But what if I need metallic shaft? $\endgroup$
    – zhekaus
    Feb 26, 2021 at 21:49
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    $\begingroup$ Well, if you have a machine shop, you use your imagination and machine tools to make yourself the "ideal" coupling. Otherwise, You do as 50k4 suggested and search duckduckgo.com (I don't promote the other search engines). $\endgroup$
    – ScienceGeyser
    Feb 26, 2021 at 23:08
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enter image description here

I'd use a bolt or something. I had this issue with the MG995. A 3mm bolt will fit snug into the hole, maybe use some nuts to add spacing?

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