GD&T Profile Tolerancing Applications 5

Question 1

In ASME Y14.5, when profile of a surface is used with the Ⓜ (MMC) modifier on a datum reference, what does this enable?

Accepted Answer

The profile zone shifts location as the datum feature departs from MMC

Answer

When the MMC modifier is applied to a datum reference in a profile callout, the datum reference frame can shift as the datum feature departs from MMC, allowing the profile zone to translate.

Question 2

A part drawing shows a profile of a surface tolerance callout with a value of 1.0 and the note 'EACH ELEMENT.' This means:

Accepted Answer

Each individual line cross-section must lie within 1.0 mm, but adjacent sections need not relate to each other

Answer

The 'each element' note effectively converts the control to a profile-of-a-line behavior, where each cross-sectional slice must meet the tolerance independently.

Question 3

What is the tolerance zone shape for a profile of a line tolerance applied to a straight line element?

Accepted Answer

Two parallel straight lines (a 2D band)

Answer

For a straight line element, the profile of a line tolerance zone is a 2D band formed by two parallel straight lines separated by the tolerance value.

Question 4

When profile tolerancing is applied to an airfoil or turbine blade surface, which aspect makes profile essential over traditional GD&T controls?

Accepted Answer

The complex curvature that varies continuously requires a single tolerance to govern the true aerodynamic profile

Answer

Continuously varying complex aerodynamic curvature cannot be adequately controlled with individual size, form, or location tolerances; profile tolerancing defines the entire true surface in one control.

Question 5

The simultaneous requirement rule in GD&T means that profile tolerances sharing the same datum reference frame are gauged:

Accepted Answer

Simultaneously in a single setup without repositioning the part

Answer

Simultaneous requirements means multiple profile (or other) tolerances sharing the same DRF must be verified in a single setup without moving the part, ensuring mutual consistency.

(GD&T) Geometric Dimensioning and Tolerancing Certification Practice Test

(GD&T) Geometric Dimensioning and Tolerancing Certification Practice Test

GD&T Profile Tolerancing Applications 5