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Linkages DOF of a Stephenson 6-bar link

  1. Nov 11, 2007 #1
    [SOLVED] Linkages DOF of a Stephenson 6-bar link

    1. The problem statement, all variables and given/known data


    2. Relevant equations

    Grubler's Criterion
    m (#DOF)= 3(n-1)-2g

    3. The attempt at a solution

    In the image I uploaded. I counted 2 turnary links ( the triangle and the 3 grounded links) and 5 binaries (4links + 1 ground), but when I add every thing up I get -1 DOF. It should be 1 DOF for this 6-bar. From looking at my notes, I suspect the error lies in links 2-3. I'm just not seeing where I went wrong with this.
  2. jcsd
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