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Thread: Virtual Condition Check with RFS

  1. #1
    Associate Engineer
    Join Date
    Dec 2018
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    1

    Virtual Condition Check with RFS

    Hello all-

    I am aware of how to perform virtual condition checks for MMC and LMC but I am wondering how does one verify (what is the math?) that the RFS true position applied to a hole will work in a mating condition.

    Example:

    C'sink with .150" thru hole @ (dia) True position .010" RFS.
    mates to
    #6 thread (.138) @ (dia) True position .028" RFS

    How would you verify through math that your true position tolerancing is OK at RFS?

    Thanks

  2. #2
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
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    2,195
    There is not a virtual condition for a FOS at RFS. The size of the feature can be checked wit a go and no-go gauge sized at MMC and LMC. Location tolerance must be measured from a RF simulator (actual size).
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  3. #3
    ASME Y14.5-2009 fig 2-14 and 2-17

  4. #4
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
    Posts
    2,195
    Figure 2.14 - and 2.17 - the FOS is specified at RFS within the Feature Control Frame, there is an Outer Boundary and Inner Boundary - NOT a Virtual or Resultant condition.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

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