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Thread: Why are Robotic Arms so Gigantic and Heavy?

  1. Why are Robotic Arms so Gigantic and Heavy?

    So, I'm looking to build an arm for an industrial application. But, every industrial arm I see is gigantic and looks very heavy. I'm wondering if I'm totally missing something because some of the applications are for lifting 0.05kg or less. Like this one:
    So why the hell do they use such a massive arm?
    Maybe many robot builder prefer this. But, would it be bad if I made it lighter? Are the motors less durable or something? For example, I'm considering to use Dynamixel servos. Is that a bad choice? I'm thinking maybe they use such big arms because they can handle the constant usage and dissipate heat better? I don't want to get too far in my design only to realize there is some fatal flaw because I used smaller servos and light weight parts. Any help would be much appreciated!



  2. #2
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    Jun 2011
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    Re: Why are Robotic Arms so Gigantic and Heavy?

    Big and solid means nice and precise... otherwise you can easily have a very jiggly arm, with the lengths commonly seen in industrial applications (Ok, I have car-making arms in mind).

    If you don't need extreme precision, a minimal arm is fine, but otherwise you'll probably have problems.

    Edit: Then I watched your youtube video. It's pretty funny, because that seems like a dumb engineering choice to me. A pick n place mechanism could probably do similar and be much much faster.
    Last edited by Gertlex; 01-28-2012 at 10:53 PM.

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