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Thread: Doubt about the Single FCF for Hole and Bore

  1. #1
    Associate Engineer
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    Doubt about the Single FCF for Hole and Bore

    Hello Friends


    Please refer the attached image.


    I totally confused about the single and double FCF for Hole and counterbore.


    Now how to calculate the total positional tolerance for the following conditions.


    Sl. No.) Hole Dia, Counterbore dia.
    1) 6.3 9.4-9.6
    2) 6.4 9.4-9.6
    3) 6.3 9.4
    4) 6.4 9.6
    5) 6.4 9.4
    6) 6.3 9.6
    7) 6.3-6.4 9.4
    8) 6.3-6.4 9.6




    thanks in advance


    Vinod
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  2. #2
    Administrator Kelly Bramble's Avatar
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    The FCF applies to both the Hole and counterbore hole simultaneously.

    MMC for the hole is 6.3 and MMC for the Counterbore hole is 9.4.

    There will be two separate Size vs FCF Tolerance acceptance charts.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  3. #3
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    Hello Kello

    Still i am not clear can you little bit elloborate.

    Vinod

  4. #4
    Administrator Kelly Bramble's Avatar
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    Quote Originally Posted by VinodGDTP View Post
    Hello Kello

    Still i am not clear can you little bit elloborate.

    Vinod
    Who's book/materials are these illustration from? What standard

    The best way me ME to help you is for you to become a premium member. I can then direct you to examples within one of my ASME or ISO books.

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  5. #5
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    That is just Figure 5-37 from ASME Y14.5M-1994. (Same as Fig. 7-24 in ASME Y14.5-2009.)

  6. #6
    Administrator Kelly Bramble's Avatar
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    Quote Originally Posted by Belanger View Post
    That is just Figure 5-37 from ASME Y14.5M-1994. (Same as Fig. 7-24 in ASME Y14.5-2009.)
    Shhh... I'm trying to make a sale here!
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