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Homework Help: 3D Moment with force and couple

  1. Feb 28, 2014 #1
    1. The problem statement, all variables and given/known data
    The special-purpoise milling cutter is subjected to the force of 1040 N and a couple of 211 N·m as shown. Determine the moment of this system about point O.
    (Let's laugh at the text's typo)

    2. Relevant equations
    Mo = R x F + (Couple)

    3. The attempt at a solution
    I'm having a little difficulty with this... And I'm not sure why... I've done a question with the same question, different numbers and continue to get the right answer.


    Mo = (0 - 654.5 * .265)i - (.21 * -808.2)j + (.21 * 654.5)k + <0, 211sin39, -211cos39>

    This gave me... <-173i, 302j, -26.5k>

    The "302j" is correct, the others are not. Not sure where I went wrong.

    Image: http://imgur.com/NB1zpeS
  2. jcsd
  3. Feb 28, 2014 #2
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