Question 1

Explain a floating fastener assembly.

Accepted Answer

A floating fastener assembly is where two (or more) components are held together with fasteners (such as bolts and nuts), and both components have clearance holes for the fasteners. This type of assembly is called a floating fastener assembly because the fasteners can "float" (move) within the holes of each part of the assembly.

Question 2

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

A) True 
 B)False  True

Question 3

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

Accepted Answer

The modified fixed fastener formula for unequally distributed tolerances is:
H = F + 2T or T = (H - F) / 2
Where:
T = total position tolerance
H = MMC of the clearance hole
F = MMC of the fastener
2T=T1 +T2
Where:
T1 = tolerance for the threaded hole
T2 = tolerance for the clearance hole

Question 4

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

A) True 
 B)False

Question 5

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

A) True 
 B)False

Question 6

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...

Question 7

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 8

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

Accepted Answer

The answer of In the fixed fastener formula, the ____________________...

Question 9

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

Accepted Answer

The answer of Fasteners have two common types of variation:...

Question 10

What is the fixed fastener formula for equally distributed tolerances?

Accepted Answer

The fixed fastener formula for

Question 11

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 12

Explain a fixed fastener assembly.

Accepted Answer

A fixed fastener assembly is where a fas

Question 13

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

A) True 
 B)False

Question 14

What is the floating fastener assembly formula?

Accepted Answer

The floating fastener formula

Question 15

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

A) True 
 B)False

Exam 23: Position Tolerance Calculations

Explain a floating fastener assembly.

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).

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

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.

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.

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.

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).

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

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

What is the fixed fastener formula for equally distributed tolerances?

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 fixed fastener assembly.

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.

What is the floating fastener assembly formula?

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.

Drawing Standards

Dimensions, Tolerances, and Notes Used on Drawings

Coordinate Tolerancing and Geometric Dimensioning and Tolerancing GDT

General Dimensioning Symbols

Key GDT Terms

Symbols and Modifiers

GDT Rules

GDT Concepts

Flatness Tolerance

Straightness Tolerance

Circularity Tolerance

Cylindricity Tolerance

The Datum System

Datum Targets

Size Datum Features Rmb

Size Datum Features Mmb

Perpendicularity Tolerance

Parallelism Tolerance

Angularity Tolerance

Position Tolerance - Introduction

Position Tolerance - RFS and MMC

Position Tolerance - Special Applications

Circular and Total Runout Tolerances

Concentricity and Symmetry Tolerances

Profile Tolerance - Basic Concepts

Profile Tolerance Applications

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