Geometric Symbols & Notation Flashcards
7 cards from real GD&T practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Geometric Symbols & Notation flashcards as text
What does the continuous feature symbol (CF) indicate in a GD&T callout?
Answer: Multiple interrupted features are treated as a single continuous feature
The CF (Continuous Feature) symbol specifies that two or more interrupted features of size are treated as a single unified feature for measurement purposes.
In a feature control frame using the ASME Y14.5 standard, how many datum references can be specified?
Answer: Up to three (primary, secondary, tertiary)
A feature control frame can reference up to three datums (primary, secondary, tertiary) to fully constrain the six degrees of freedom.
A 'unilateral profile' tolerance where the band is entirely inside the true profile is indicated by:
Answer: A 'U' symbol with the inward offset value specified
In ASME Y14.5-2009 and later, an unequal/unilateral profile tolerance is shown with the 'U' symbol and a value indicating how much of the tolerance is on one side.
Which GD&T characteristic is the only one that can control all six degrees of freedom simultaneously?
Answer: Profile of a Surface
Profile of a Surface with appropriate datum references can simultaneously control size, form, orientation, and location — all six degrees of freedom.
A 'non-rigid part' notation on a drawing indicates:
Answer: The part must be inspected in a restrained or free state as specified
Non-rigid part notation flags that the component may distort under its own weight or residual stresses, and the drawing specifies whether inspection is in free or restrained state.
The symbol for 'Concentricity' in GD&T consists of:
Answer: Two concentric circles
Concentricity is represented by two concentric circles and controls that the median points of a diametrically opposed feature lie within a cylindrical tolerance zone coaxial with a datum axis.
When a GD&T callout references 'Datum A' as primary, 'Datum B' as secondary, and 'Datum C' as tertiary, the order matters because:
Answer: Each successive datum constrains additional degrees of freedom left open by the previous datum
The datum precedence order determines which datum stops which motions first; the primary datum constrains the most DOF, and each subsequent datum constrains remaining ones.