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    Pendulum with Servo

    Scheduled Pinned Locked Moved SketchyPhysics
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    • T Offline
      twharvey
      last edited by

      Hi All,

      I'm building a clock originally designed as a wooden device by Brian Law (http://www.woodenclocks.co.uk/). The clock is driven by a motor on the gear on the lower left looking at the front of the clock. In the original design, this was a round box with a spring drive. The clock is regulated by a pendulum that operates the escapement, which , in turn, regulates the clock's rotation rate.

      The thing is working pretty well right now, but there is one small problem. The pendulum's movement is controlled by an oscillator. By changing the oscillation rate, it should be possible to set the rate of movement of the whole thing so that it actually tells the time. The trouble is that the pendulum wobbles about it's pivot point (see arrow in screen shot.) This, in turn, causes the escapement to behave in a erratic way as well. My question: is there a way to anchor the pendulum's pivot more securely?

      Any help would be appreciated,
      Tom


      PendulumPivotWobble.jpg

      Tom

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      • T Offline
        twharvey
        last edited by

        I couldn't upload the model because the file is too big, but I did put it in the 3DWH and made a video of the problem.
        http://youtu.be/37KVnayVNrE
        ,
        http://sketchup.google.com/3dwarehouse/search?viewer=0388592991624889543320564&scoring=m

        Tom

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        • T Offline
          twharvey
          last edited by

          Here'a another clock simulation that works (mostly): https://www.youtube.com/watch?v=OlwAsxMtGno
          The model is in the 3DWH at:http://sketchup.google.com/3dwarehouse/details?mid=3daed4d60664406ecffc164bf5e00c8f

          Tom

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