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Material Condition Modifiers Flashcards

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  1. Which symbol is used in a feature control frame to indicate the Maximum Material Condition modifier?

    Answer: Ⓜ

    The circled M symbol (Ⓜ) is used in a feature control frame to designate the MMC modifier per ASME Y14.5.

  2. In a functional gauge for a position tolerance at MMC, the gauge pin diameter for a hole pattern would equal:

    Answer: The MMC of the hole minus the positional tolerance

    The gauge pin diameter equals the virtual condition of the hole = MMC hole size minus the positional tolerance (for an internal feature).

  3. A feature control frame reads: position | 0.3Ⓜ | A | BⓂ. What does the Ⓜ on datum B indicate?

    Answer: Datum shift is allowed based on datum B's departure from MMC

    An MMC modifier on a datum reference (B Ⓜ) permits the datum reference frame to shift by the amount datum feature B departs from its MMC.

  4. Under the envelope principle (Rule #1), a feature of size must not violate its MMC perfect form boundary. Which material condition modifier explicitly overrides this rule?

    Answer: Free State — it suspends Rule #1 for flexible parts

    The Free State modifier (Ⓕ) suspends Rule #1 for non-rigid (flexible) parts measured in the free (unconstrained) state.

  5. Two mating parts use a clearance fit. The designer wants maximum allowable positional error when parts are easiest to assemble. Which modifier should be applied?

    Answer: MMC

    MMC provides maximum bonus tolerance when parts are at their smallest shaft / largest hole (most clearance), maximizing allowed position error when assembly is easiest.

  6. A straightness callout of 0.1 Ⓜ is applied to a shaft with MMC of 25.0 mm and LMC of 24.6 mm. What is the maximum possible derived median line straightness tolerance?

    Answer: 0.5 mm

    Maximum bonus = MMC (25.0) − LMC (24.6) = 0.4 mm; total max = 0.1 + 0.4 = 0.5 mm.

  7. Which of the following best defines 'actual mating size' as used when calculating bonus tolerance?

    Answer: The size of the largest perfect feature that will fit inside (or around) the produced feature

    Actual mating size is the size of the largest (for internal) or smallest (for external) perfect counterpart that fits the feature, used to determine departure from MMC.