GD&T Composite Feature Control 4

Question 1

An MMC modifier is applied to the FRTZF of a composite position callout. What benefit does this provide?

Accepted Answer

It provides bonus tolerance for feature-to-feature location as features depart from MMC

Answer

An MMC modifier on the FRTZF allows each feature's tolerance zone to increase (bonus tolerance) as the feature departs from MMC, while still maintaining pattern geometry.

Question 2

A composite callout has PLTZF|A|B|C and FRTZF|A|B. Compared to FRTZF|A only, what additional constraint does adding datum B impose?

Accepted Answer

Restricts rotation about the datum B axis

Answer

Adding datum B (typically a secondary datum) to the FRTZF restricts the rotational degree of freedom about the axis perpendicular to datum B, locking the pattern's clocking.

Question 3

For a pattern of four holes using composite position, how many total cylindrical tolerance zones must each physical hole simultaneously satisfy?

Accepted Answer

Two

Answer

Each physical hole must satisfy two cylindrical tolerance zones simultaneously: one from the PLTZF and one from the FRTZF.

Question 4

In ASME Y14.5-2018, which symbol is used to indicate 'Separately' when the simultaneous requirement should NOT apply to composite callouts on the same drawing?

Accepted Answer

SEP

Answer

The notation 'SEP REQT' (Separately) is added to indicate that multiple geometric tolerances referencing the same DRF should be verified independently rather than simultaneously.

Question 5

A composite positional tolerance controls a pattern of slots. The FRTZF is wider than the individual slot tolerance zone. This situation is:

Accepted Answer

Invalid because the FRTZF must always be smaller than the PLTZF

Answer

The FRTZF tolerance must always be equal to or smaller than the PLTZF tolerance, since the FRTZF zones must fit within the PLTZF framework.

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

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

GD&T Composite Feature Control 4