GD&T Composite Feature Control 2 — Questions and Answers

Question 1: In a composite feature control frame, the upper segment is called the:

Feature-Relating Tolerance (FRT)
Feature Level Control (FLC)
Feature Control Tolerance Zone (FCTZ)
Pattern-Locating Tolerance Zone Framework (PLTZF) (Correct answer)

Correct answer: Pattern-Locating Tolerance Zone Framework (PLTZF)

The upper segment of a composite feature control frame is called the Pattern-Locating Tolerance Zone Framework (PLTZF), which controls the location of the pattern as a whole.

Question 2: Which datum references are typically included in the Feature-Relating Tolerance Zone Framework (FRTZF) of a composite callout?

All datums from the PLTZF
Only orientation datums, no location datums (Correct answer)
No datums at all
Additional datums not in the PLTZF

Correct answer: Only orientation datums, no location datums

The FRTZF typically references only orientation datums (like datum A for perpendicularity) but not location datums, since it controls feature-to-feature relationships rather than absolute location.

Question 3: A composite positional tolerance has PLTZF of ⌀0.8 and FRTZF of ⌀0.3. What does ⌀0.3 control?

The location of the pattern from datums B and C
The spacing between individual features within the pattern (Correct answer)
The size tolerance of each feature
The perpendicularity of each feature to datum A only

Correct answer: The spacing between individual features within the pattern

The FRTZF tolerance of ⌀0.3 controls the spacing and orientation of features relative to each other within the pattern.

Question 4: Can a composite feature control frame be used with profile of a surface tolerances?

No, composite frames are only valid for position tolerances
Yes, composite profile tolerances are explicitly defined in ASME Y14.5 (Correct answer)
Yes, but only for internal features
No, profile uses bilateral tolerances exclusively

Correct answer: Yes, composite profile tolerances are explicitly defined in ASME Y14.5

ASME Y14.5 explicitly defines composite profile tolerances, where the upper segment controls location and the lower segment controls form, orientation, and feature-to-feature relationships.

Question 5: When a datum reference is repeated in both the PLTZF and FRTZF of a composite callout, what does it mean in the lower segment?

It has no effect in the lower segment
It restricts the FRTZF from translating relative to that datum (Correct answer)
It doubles the tolerance value
It applies the tolerance to that datum feature only

Correct answer: It restricts the FRTZF from translating relative to that datum

When a datum is repeated in the FRTZF, it restricts translation of the tolerance zone relative to that datum while still allowing the zone to shift in other directions.

Question 6: Two single-segment position callouts differ from a composite callout because:

Two single-segment callouts cannot reference the same datums
Each segment of a two single-segment callout independently locates features from its referenced datums (Correct answer)
Two single-segment callouts always have larger tolerances
Two single-segment callouts apply only to patterns of two features

Correct answer: Each segment of a two single-segment callout independently locates features from its referenced datums

In a two single-segment callout, each segment independently locates features from its own datum references, whereas the FRTZF in a composite callout controls only feature-to-feature relationships.

Question 7: In composite tolerancing, which condition must always be true regarding the PLTZF and FRTZF tolerance values?

FRTZF must be larger than PLTZF
PLTZF must be larger than or equal to FRTZF (Correct answer)
Both tolerance zones must be equal
PLTZF applies only at MMC

Correct answer: PLTZF must be larger than or equal to FRTZF

The PLTZF tolerance must always be equal to or larger than the FRTZF tolerance, since the FRTZF zone must fit within the PLTZF zone.

Question 8: An MMC modifier is applied to the FRTZF of a composite position callout. What benefit does this provide?

It allows the PLTZF to increase
It provides bonus tolerance for feature-to-feature location as features depart from MMC (Correct answer)
It eliminates the need for the PLTZF
It restricts the tolerance to the minimum material condition only

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

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 9: 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?

Restricts translation perpendicular to datum B
Restricts rotation about the axis perpendicular to datum B
Restricts rotation about the datum B axis (Correct answer)
Removes all translational freedom from the FRTZF

Correct answer: Restricts rotation about the datum B axis

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

One
Two (Correct answer)
Four
Eight

Correct answer: Two

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

Question 11: 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?

SIM
SEP (Correct answer)
SQ
ISO

Correct answer: SEP

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

Valid because the FRTZF overrides the size tolerance
Invalid because the FRTZF cannot exceed the pattern size tolerance
Valid if MMC modifier is used
Invalid because the FRTZF must always be smaller than the PLTZF (Correct answer)

Correct answer: Invalid because the FRTZF must always be smaller than the PLTZF

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

Question 13: Which of the following best describes the 'float' allowed by the FRTZF in composite tolerancing?

Each individual feature zone floats independently within the PLTZF
The entire FRTZF pattern of zones shifts as a rigid group within the PLTZF zones (Correct answer)
Features can rotate individually within the FRTZF zones
The FRTZF zones expand to accommodate manufacturing variation

Correct answer: The entire FRTZF pattern of zones shifts as a rigid group within the PLTZF zones

The FRTZF tolerance zone framework shifts and (if no orientation datums are cited) rotates as a rigid group, maintaining the pattern geometry while accommodating location variation.

Question 14: When verifying composite position with a functional gauge, which segment drives the gauge hole locations?

The FRTZF always drives gauge hole locations
The PLTZF drives the absolute pattern location; a separate gauge checks FRTZF (Correct answer)
Both segments are checked with a single gauge simultaneously
The gauge only verifies the larger of the two tolerances

Correct answer: The PLTZF drives the absolute pattern location; a separate gauge checks FRTZF

A PLTZF functional gauge locates holes at true position relative to the datum reference frame; a separate FRTZF gauge checks the feature-to-feature geometry with holes at the FRTZF tolerance size.

Question 15: In a composite profile callout, the lower-segment tolerance zone is described as a uniform-width band. This band is allowed to:

Expand beyond the upper-segment band
Translate and/or rotate relative to the true profile, within limits set by the upper segment (Correct answer)
Change shape relative to the nominal profile
Apply only to internal profiles

Correct answer: Translate and/or rotate relative to the true profile, within limits set by the upper segment

The lower-segment profile tolerance zone can translate and rotate relative to the true profile position, but it must remain entirely within the upper-segment tolerance zone.

Question 16: A designer specifies composite position with PLTZF ⌀0.5 and FRTZF ⌀0.5. What is the practical effect?

The FRTZF has no additional restraint beyond the PLTZF (Correct answer)
The feature spacing is twice as tight as the pattern location
The PLTZF is redundant and can be eliminated
The two zones create a spherical tolerance zone

Correct answer: The FRTZF has no additional restraint beyond the PLTZF

When PLTZF and FRTZF have equal values, the lower segment provides no additional tightening of feature-to-feature relationships beyond what the upper segment already requires.

Question 17: Under ASME Y14.5, a composite feature control frame is distinguished from a two single-segment frame by:

The composite frame uses two separate geometric characteristic symbols
The composite frame uses one geometric characteristic symbol spanning both rows (Correct answer)
The composite frame requires MMC in both segments
The composite frame applies only to cylindrical features

Correct answer: The composite frame uses one geometric characteristic symbol spanning both rows

A composite frame has a single geometric characteristic symbol (e.g., position circle) that extends vertically across both rows, while a two single-segment frame repeats the symbol in each row independently.

Question 18: For a composite position callout, which statement about the FRTZF zone orientation is correct when datum A (a flat surface) is the only FRTZF datum?

The FRTZF zones are free to translate in X and Y but are locked in rotation about all axes
The FRTZF zones must remain perpendicular to datum A but may translate in X and Y (Correct answer)
The FRTZF zones are free to translate in all directions and rotate about all axes
The FRTZF zones are locked to the true position relative to datum A

Correct answer: The FRTZF zones must remain perpendicular to datum A but may translate in X and Y

With only datum A (primary flat surface) in the FRTZF, the zones must remain perpendicular to A (orientation locked) but can translate freely in X and Y within the PLTZF boundaries.

Question 19: A part drawing shows composite position with PLTZF ⌀0.8|A|B|C and FRTZF ⌀0.3|A|B|C. This is functionally equivalent to:

A single position callout of ⌀0.3|A|B|C
Two single-segment callouts of ⌀0.8|A|B|C and ⌀0.3|A|B|C (Correct answer)
A profile callout of 0.4|A|B|C
A composite callout with no PLTZF datums

Correct answer: Two single-segment callouts of ⌀0.8|A|B|C and ⌀0.3|A|B|C

When all three datums appear in both segments of a composite frame, it is functionally equivalent to two single-segment position callouts because the FRTZF is fully constrained with no freedom to translate or rotate.

Question 20: Which of the following is a valid reason to choose composite tolerancing over a tighter single position tolerance?

To avoid specifying datums on the drawing
To allow more variation in pattern location relative to datums while ensuring parts assemble correctly with mating features (Correct answer)
To eliminate the need for functional gauging
To apply different geometric characteristics to the same feature

Correct answer: To allow more variation in pattern location relative to datums while ensuring parts assemble correctly with mating features

Composite tolerancing allows a loose location tolerance for assembly into a housing while maintaining tight feature-to-feature spacing needed for mating with a bolt pattern, optimizing manufacturability.

Question 21: When applying composite position to a non-circular pattern (e.g., rectangular slots), the FRTZF tolerance zones are:

Always cylindrical regardless of feature shape
Shaped to match the tolerance zone type appropriate for the feature (e.g., width zones for slots) (Correct answer)
Converted to a bilateral profile tolerance
Applied only to the center plane of each slot

Correct answer: Shaped to match the tolerance zone type appropriate for the feature (e.g., width zones for slots)

For slot patterns, the FRTZF tolerance zones are parallel-plane (width) zones that match the center-plane geometry of the slots, not cylindrical zones.

GD&T Composite Feature Control 2

In a composite feature control frame, the upper segment is called the:

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