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WHY IS THIS MECHANISMS NOT FIXED?

DYLAN YANGDYLAN YANG ✭
in 3-Axis Robotic Mechanisms
I learned to built this neck mechanism following the instructions given in course. But as I built the model using CAD, I realize that when the two cranks of the servoes are fixed, the neck platform is still not fixed. Why is that?  Where did I do wrong?

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  • Matt WinstonMatt Winston Admin
    Hi Dylan, We passed your question along to course instructor Jim Kundig, and he would like to know which CAD program you're using.
  • DYLAN YANGDYLAN YANG ✭
    Matt Winston said:
    Hi Dylan, We passed your question along to course instructor Jim Kundig, and he would like to know which CAD program you're using.
    Thank you so much for your reply! I'm using Solidworks.
  • Matt WinstonMatt Winston Admin
    Ok thank you for letting me know @DYLAN YANG, I've passed that info along to Jim Kundig and will get back to you with any advice that he shares.

  • DYLAN YANGDYLAN YANG ✭
    Matt Winston said:
    Ok thank you for letting me know @DYLAN YANG, I've passed that info along to Jim Kundig and will get back to you with any advice that he shares.

    Hi Matt, I just figured out why it's not fixed. It because the upper component of the universal joint is not fixed in the CAD model. But I still have the problem of unstability of the platform when the head is standing up right. Little movements of the servoes could lead to very big swing of the head. Is there anyway to stablize it? Also, I'm hoping to move the servoes close to one another, is it gonna cause more instability?
  • Matt WinstonMatt Winston Admin
    Hey @DYLAN YANG, here's some advice from Jim Kundig:

    "If little movements in the servos lead to big swings of the head, try moving the attach point on the servo arm closer to the "spline" (which is where the horn attaches to the servo).  You can also get the same effect by moving the attach points for the rods on the head out further from the U-Joint.  This is less of an option usually because you want the figure to stay within certain limits if you want it to look like a Terminator or anything humanoid.
    Let me know if this makes sense and/or helps..."
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