ABSTRACT
[Note: Questions 1-7 refer to the virtual condition MMC concept.]
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When a feature has errors of orientation, position and certain tolerances of form, its mating size is virtually altered.
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In virtual condition MMC concept, the size of a hole is virtually increased and the shaft size virtually decreased, even though they still measure within their limits of size.
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A virtual condition MMC concept of the feature represents the worst condition of assembly of the mating components.
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If a feature is allowed a virtual condition, it may exceed its limits of size as an individual feature when measured.
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Functional gages are made to the virtual condition MMC concept of the features they gage.
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Functional gages are usually only made to check features controlled with MMC. Otherwise, for checking features controlled RFS, a functional gage would have to be made to take into account every size the feature could be produced at.
How does calculating the virtual condition MMC concept of an external feature differ from calculating the virtual condition of an internal feature?
