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Material Condition Modifiers Flashcards

7 cards from real GD&T practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. The term 'resultant condition' for an internal feature controlled at MMC refers to:

    Answer: The worst-case inner boundary considering both size and geometric tolerance

    The resultant condition of an internal feature at MMC is the worst-case inner boundary = LMC size minus the maximum allowable tolerance.

  2. Which of the following GD&T tolerances is most commonly applied with an MMC modifier to take advantage of bonus tolerance for assembly purposes?

    Answer: True Position

    True position is most commonly modified with MMC because assembly clearance naturally increases when mating features depart from MMC.

  3. An LMC modifier is most useful for controlling which engineering concern?

    Answer: Minimum wall thickness and edge distance

    LMC ensures minimum material (wall thickness, edge distance) is maintained, making it useful for structural or sealing concerns.

  4. A pin (external feature) has a size range of 9.9–10.0 mm. At MMC, the straightness tolerance is 0.05 mm. What is the maximum allowable straightness tolerance when the pin measures 9.9 mm?

    Answer: 0.15 mm

    At 9.9 mm (LMC), departure from MMC is 0.1 mm; adding this bonus to 0.05 mm gives 0.15 mm total.

  5. Which boundary is established by the MMC size of an external feature PLUS its applicable geometric tolerance?

    Answer: Outer boundary / Virtual condition

    For an external feature at MMC, the virtual condition (worst-case outer boundary) equals MMC size plus the geometric tolerance.

  6. When an MMC modifier is applied to a tolerance of flatness, what happens?

    Answer: It is invalid — flatness cannot use MMC

    Flatness is a surface form control that does not reference feature size, so applying MMC to flatness is not allowed per ASME Y14.5.

  7. Datum shift is analogous to bonus tolerance. Which statement correctly describes datum shift?

    Answer: It is the allowable movement of the true datum axis/plane due to the datum feature's departure from its referenced material condition

    Datum shift is the permissible translation/rotation of the datum reference frame that occurs when the datum feature departs from its referenced material condition.