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Summersnow8

  • one year ago

Find the mechanical advantage of a pipe vise if it has a handle diameter of 16 in., a screw diameter of 0.75 in., and a screw pitch of 0.125 in. FR * pitch = FE * 2pi * r MA = 2 pi r / pitch = 2 pi (d/2) / pitch = pi d / pitch = pi * 16 in / 0.125 in = 128 pi = 804.248 = 804 how many significant figures should my answer be? 2 or 3?

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  1. Michele_Laino
    • one year ago
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    your answer is correct! I think that better is to round off to the nearest hundred, namely: MA= 800

  2. Summersnow8
    • one year ago
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    actually, the answer should be 400... but I am not sure how to get that answer

  3. Michele_Laino
    • one year ago
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    I'm pondering...

  4. Michele_Laino
    • one year ago
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    maybe we have to consider the efficiency of the screw which can be 0.5

  5. Michele_Laino
    • one year ago
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    if we have to consider the efficiency of the screw, then the requested advantage is: \[\Large MA = \frac{{\pi D}}{{pitch}} \times \eta \] where \eta is the efficiency of the screw Please keep in mind that a screw is a simple machine, so it has an own efficiency

  6. Michele_Laino
    • one year ago
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    of course, we have: \[\Large \eta = 50\% \]

  7. Summersnow8
    • one year ago
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    @Michele_Laino MA = (π * 16 in / 2) * 50% = 12? how do I get 400?

  8. Michele_Laino
    • one year ago
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    Sorry, I got this: \[MA = \frac{{3.14 \times 16}}{{0.125}} = 401.92\]

  9. Summersnow8
    • one year ago
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    why do we use 16 in and not .75 in ?

  10. Summersnow8
    • one year ago
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    @Michele_Laino

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