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Exam 23: Position Tolerance Calculations

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Question 1

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In some cases, it is desired to have an unequal distribution of the tolerances between the clearance holes and the threaded holes. In these cases, the total amount of tolerance resulting from the fixed fastener formula is distributed unequally.

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Question 2

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The fixed and floating fastener formulas are useful tools for a quick way to establish tolerance values. Additionally, they also account for the typical fastener deviations.

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Question 3

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What is the fixed fastener formula for equally distributed tolerances?

In the fixed fastener formula, the ____________________ of the fastener is equal to the stated thread major diameter.

Both common types of typical fastener deviations can cause the fastener body to interfere with the surface of the clearance hole in a bolted assembly.

Where the fixed fastener formula is used, the position tolerance values result in a(n) ____________________ clearance condition when the holes are at MMC and located at their extremes (virtual conditions).

Explain a fixed fastener assembly.

Where the floating fastener formula is used, the position tolerance values result in a(n) ____________________ clearance condition when the holes are at MMC and located at their extremes (virtual conditions).

Explain a floating fastener assembly.

What is the modified fixed fastener formula for unequally distributed tolerances?

What is the floating fastener assembly formula?

Fasteners have two common types of variation: straightness deviation and thread to shank (body) runout (____________________).

When using the floating fastener assembly, after the position tolerance zone value is calculated, it applies to each part in the assembly (if the clearance holes are the same hole size used in the formula).

When tolerancing a threaded hole, the projected ____________________ zone modifier should be specified in the position tolerance feature control frame to indicate that the tolerance zone applies outside the hole where the fastener passes through the mating part.

When using the floating fastener assembly, since the function is assembly, the MMC modifier is used in the tolerance portion of the position callout. This allows additional location tolerance as a hole departs from MMC.