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Position Tolerancing Calculations 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. A hole has a position tolerance of ⌀0.4 at MMC. The actual hole diameter is 10.3 mm and MMC is 10.0 mm. What is the total allowable position tolerance?

    Answer: ⌀0.7

    At MMC the tolerance is ⌀0.4; the hole is 0.3 mm larger than MMC, so bonus tolerance adds 0.3, giving ⌀0.7 total.

  2. For a pattern of four holes, the True Position is defined by basic dimensions from datum A (primary), B (secondary), and C (tertiary). Which datum controls orientation of the pattern?

    Answer: Datum A

    The primary datum (A) controls orientation — it establishes the first degree of constraint, typically perpendicularity or parallelism.

  3. A shaft pin has a position tolerance of ⌀0.5 at LMC. The actual pin diameter is 12.0 mm and LMC is 12.3 mm. What bonus tolerance is available?

    Answer: ⌀0.3

    At LMC, bonus tolerance equals the amount the actual size departs from LMC: 12.3 − 12.0 = 0.3 mm added to the stated ⌀0.5.

  4. The formula for converting a Cartesian position deviation (Δx, Δy) to a diametral position error is:

    Answer: 2√(Δx² + Δy²)

    The diametral true-position error = 2 × √(Δx² + Δy²), because the cylindrical tolerance zone is centered on true position.

  5. A hole center is measured at X = 25.08 mm and Y = 15.06 mm. Basic dimensions are X = 25.00 and Y = 15.00. What is the diametral position error?

    Answer: ⌀0.10

    Δx = 0.08, Δy = 0.06; radial error = √(0.08² + 0.06²) = √(0.01) = 0.10; diametral = 2 × 0.05 = ⌀0.10.

  6. When RFS (Regardless of Feature Size) is applied to a position tolerance, bonus tolerance is:

    Answer: Not applicable — no bonus is allowed

    RFS means the geometric tolerance applies at every actual feature size with no bonus; the tolerance value is fixed.

  7. A composite position callout has an upper segment of ⌀0.8 and a lower segment of ⌀0.2. What does the lower segment control?

    Answer: Feature-to-feature spacing within the pattern

    The lower (FRTZF) segment of a composite callout controls feature-to-feature relationship (spacing/orientation) within the pattern, not its location from external datums.