Question 1

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.

Accepted Answer

This statement is true. Sometimes, designers may want a tighter fit between the threaded hole and the fastener than between the clearance hole and the fastener. In these cases, an unequal distribution of tolerances is desired and can be achieved by adjusting the fixed fastener formula accordingly.

Question 2

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

Accepted Answer

coaxiality

Question 3

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

Accepted Answer

MMC

Question 4

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.

Accepted Answer

The fixed and floating fastener formulas are used to calculate tolerance stack-ups in assemblies, but they do not account for typical fastener deviations.

Question 5

Explain a fixed fastener assembly.

Accepted Answer

The answer of Explain a fixed fastener assembly....

Question 6

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).

Accepted Answer

The answer of Where the floating fastener formula is used,...

Question 7

Explain a floating fastener assembly.

Accepted Answer

The answer of Explain a floating fastener assembly....

Question 8

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).

Accepted Answer

The answer of Where the fixed fastener formula is used,...

Question 9

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.

Accepted Answer

Both radial and angular fastener deviations can cause the fastener body to interfere with the surface of the clearance hole, leading to misalignment and potential assembly issues.

Question 10

What is the fixed fastener formula for equally distributed tolerances?

Accepted Answer

The answer of What is the fixed fastener formula for...

Question 11

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

Accepted Answer

The answer of What is the modified fixed fastener formula...

Question 12

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.

Accepted Answer

The statement is true. The MMC modifier allows for additional tolerance when a feature departs from its maximum material condition.

Question 13

What is the floating fastener assembly formula?

Accepted Answer

The answer of What is the floating fastener assembly formula?...

Question 14

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).

Accepted Answer

This is because the position tolerance zone value is based on the hole size and its relationship with the tolerance of the mating part, and not on the specific part itself.

Question 15

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.

Accepted Answer

The answer of When tolerancing a threaded hole, the projected...

Quiz 23: Position Tolerance Calculations