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Thread: Servo bolts

  1. #1

    Servo bolts

    Hi everyone,

    I started my first robotics project, and i'm a little stuck trying to connect my servos (HS-422 for example) to... anything.

    on the servo, the plastic circle that spins (does it have a more 'technical name'?) has holes all around it. my problem is that in order to connect anything to the rotating circle, i need bolts small enough to fit through those holes! i figured M2 bolts do not fit, so i probably need M1 in size. does anyone know where i can buy those, or any other bolts i can use to connect to the round, plastic, rotating disc of the servo??

  2. #2
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    Re: Servo bolts

    Check out mcmaster.com.

    Paul

  3. #3
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    Re: Servo bolts

    The "technical" name is "servo horn"

    Naw, you don't need screws that fit - you need a drill-press. #4 screws fit just fine after a little convincing on the drill press.

    And I'm not alone on that - The CrustCrawler SG5 arm kit instructions call for the holes to be drilled-out too. I've never built a project that I didn't drill out the servo horns...
    I Void Warranties´┐Ż

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    Re: Servo bolts

    I believe the standard hole on a servo horn is designed to accept a #2 sheet metal screw. However, as others are saying, a drill press (or a drill) and a tap (a tool that makes threads) will get it to accept larger machine screws.

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    Re: Servo bolts

    Why tap it? That nylon won't hold a thread for a metal machine screw under any kind of load. That's why they made nuts. Bonus points for Nylock-type locking nuts...

    If you are going to tap it, make sure you use nylon bolts.
    I Void Warranties´┐Ż

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    Re: Servo bolts

    Also depending on what you are connecting to the servo horn these discs are designed to be used with the Model clevis, which is a control horn used in model aircraft to link to the control surfaces. A metal two pronged clip with a pin that fits through the servo disc and is retained by the other prong. But this is only for a push/pull type scenario, not for direct load bearing on robots. Just another option. But in general I replace the nylon servo horn with metal/alloy discs much stronger.
    http://www.lynxmotion.com/Product.as...&CategoryID=75
    People yearn after this robotic dream, but you can't strip your life of all meaning, emotion and feeling and expect to function.


  7. #7

    Re: Servo bolts

    Thanks for the ideas guys! yea, i thought to make bigger holes by drilling, but i guess i didnt want to 'scar' my new servos... i suppose as long as it works its a good idea.

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    Re: Servo bolts

    You'll need to get used to 'scar'-ing brand new things if you're going to build robots!

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    Re: Servo bolts

    i have a ? that kind of goes in hear? I have a MG995 servo and wanted to know if (any) servo horn will fit?
    Lynxmotion Hitec Spline Metal Servo Horn



    I was looking at this but wanted to know if its the size?

  10. #10

    Re: Servo bolts

    The above Hitec splined (24 count) metal servo horn should not be used with a Tower MG995 servo, as that servo is appears to have a Futaba spline (25 count). See this RC servo info post.

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