Deck 10: Straightness Tolerance

Question 1

Wherever Rule #1 applies to a cylindrical regular feature of size, an indirect straightness deviation requirement exists for the derived median line of the feature of size.

Answer 1

True

Question 2

Although Rule #1 provides an indirect straightness tolerance, a straightness tolerance should be specified on surface elements, unless it is a refinement of the dimensional limits of the size dimension (i.e., size tolerance).

Answer 2

False

Question 3

Define a derived median line.

Answer 3

A derived median line is an imperfect line formed by the center points of all cross sections of a feature of size. These cross sections are perpendicular to the axis of the unrelated actual mating envelope of the feature of size.

Question 4

When verifying a straightness tolerance applied to surface elements, what are the three separate requirements that must be checked?

Question 5

Wherever Rule #1 applies to a cylindrical feature of size, it invokes an indirect straightness deviation requirement on the surface elements.

Question 6

Explain how to determine whether a straightness tolerance is applied to a surface element or a feature of size.

Question 7

Where a straightness tolerance is applied to surface elements that are associated with a size dimension, and Rule #1 applies to the size dimension, the straightness tolerance value must be less than the ____________________ tolerance.

Question 8

A(n) ____________________ is a device that applies the use of optics to measure part geometry.

Question 9

Where a straightness tolerance is applied to a cylindrical feature of size, the ____________________ must be located within the tolerance zone and the tolerance zone is not related to any datums.

Question 10

Where a straightness tolerance is applied to a surface element that is associated with a size dimension, and Rule #1 does not apply to the size dimension (i.e., overridden, independency, stock size, etc.), the straightness tolerance value may be smaller than the size tolerance.

Question 11

What are the three things that should come to mind wherever a straightness tolerance with the MMC modifier is associated with a feature of size dimension?

Question 12

What are the two tolerance zone shapes a straightness tolerance can have?

Question 13

Where the feature of size is at ____________________, the derived median line of the feature of size must be perfectly straight.

Question 14

A straightness tolerance is a geometric tolerance that defines the straightness deviation permitted on individual surface elements or on a derived median line.

Question 15

____________________ is the condition where an element of a surface, or a derived median line, is a straight line.