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Thread: Please help answer this question

  1. #1
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    Please help answer this question

    Can someone please help answer the following questions?

    C3. Using the fixed fastener formula calculate the true position tolerance for the two patterns shown below. (Show your work).

    C3.1. The size of the bolts are (diameter) 0.492 0.500 and the size of the clearance holes are (diameter) 0.520 0.536.
    [IMG]file:///C:/Users/PETERB~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.png[/IMG]
    C3.2 The size of the bolts are (diameter) 0.245 0.250 and the size of the clearance holes are (diameter) 0.2656 0.270.

    C3.3 Use the floating fastener formula and calculate the true position tolerance for the above 4 hole pattern, given the size of the bolts are (diameter) 0.492 0.500 and the size of the clearance holes are (diameter) 0.520 0.536.
    [IMG]file:///C:/Users/PETERB~1/AppData/Local/Temp/msohtmlclip1/01/clip_image004.png[/IMG]
    C3.4 Using the floating fastener formula calculate the plus/minus tolerance for the holes shown above if the bolts are 0.370 0.375 and the clearance holes are 0.386 0.397.

    C3.5 Repeat the above calculation using the fixed fastener formula.
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  2. #2
    Administrator Kelly Bramble's Avatar
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    From who's book/material is this?

    Quote Originally Posted by peterbotros91 View Post
    Can someone please help answer the following questions?

    C3. Using the fixed fastener formula calculate the true position tolerance for the two patterns shown below. (Show your work).

    C3.1. The size of the bolts are (diameter) 0.492 – 0.500 and the size of the clearance holes are (diameter) 0.520 – 0.536.
    [IMG]file:///C:/Users/PETERB~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.png[/IMG]
    C3.2 The size of the bolts are (diameter) 0.245 – 0.250 and the size of the clearance holes are (diameter) 0.2656 – 0.270.

    C3.3 Use the floating fastener formula and calculate the true position tolerance for the above 4 hole pattern, given the size of the bolts are (diameter) 0.492 – 0.500 and the size of the clearance holes are (diameter) 0.520 – 0.536.
    [IMG]file:///C:/Users/PETERB~1/AppData/Local/Temp/msohtmlclip1/01/clip_image004.png[/IMG]
    C3.4 Using the floating fastener formula calculate the plus/minus tolerance for the holes shown above if the bolts are 0.370 – 0.375 and the clearance holes are 0.386 – 0.397.

    C3.5 Repeat the above calculation using the fixed fastener formula.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  3. #3
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    It's from a past Professional Engineers of Ontrio exam

  4. #4
    Administrator Kelly Bramble's Avatar
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    Ontrio?


    http://www.peo.on.ca/index.php?ci_id=2060&la_id=1#News

    I'm a little confused, when did any PE test include tolerance analysis such as Fixed Fastener Condition?

    To what dimensioning and tolerancing standard?
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  5. #5
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    these are technical exams

  6. #6
    Administrator Kelly Bramble's Avatar
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    I’m going to pass on providing a detailed (show my work) answer. If you’re seeking a PE in any place of the world you should know the basic equation and the required algebra to get the answers.

    Quite honesty the question looks like it comes from a competitor of Engineers Edge GD&T training resources and we don’t support school work or competitor’s material.

    Moreover, getting the solution yet not learning the concept doesn’t help you or your future employer

    Here’s a link to a free fixed fastener calculator:
    https://www.engineersedge.com/fixed_fastener.htm
    And Floating Fastener Condition is here:
    https://www.engineersedge.com/floating_fastener.htm
    And a bunch of other tolerance related calculators and resources:
    https://www.engineersedge.com/tolerance_chart.htm

    Good luck
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

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