Geometric Dimensioning and Tolerancing (GD&T) Basics
This worksheet introduces Grade 11 students to the fundamental concepts of Geometric Dimensioning and Tolerancing (GD&T), including basic dimensioning rules, feature control frames, and common symbols.
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Geometric Dimensioning and Tolerancing (GD&T) Basics
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Read each question carefully and provide your answers in the space provided. For questions requiring diagrams, ensure your sketches are clear and correctly labeled.
1. Which of the following is NOT a fundamental rule of dimensioning?
Each feature must be dimensioned only once.
Dimensions should be placed where the feature is clearly shown.
Dimensions should be duplicated in multiple views to ensure clarity.
Dimensions should be placed external to the object whenever possible.
2. What does a 'Feature Control Frame' primarily communicate in GD&T?
The material properties of the part.
The tolerance applied to a specific geometric feature.
The manufacturing process to be used.
The assembly instructions for the part.
3. A basic dimension is theoretically exact and enclosed in a .
4. The symbol for indicates that a feature must be perfectly cylindrical.
5. In GD&T, define the allowable variation in the form or position of a feature.
6. Briefly explain the difference between a size dimension and a geometric tolerance.
7. For the rectangle shown below, add appropriate dimensions for its length and width. Assume the dimensions are in millimeters.
8. All dimensions on a technical drawing must have a tolerance specified.
True
False
9. A datum feature is a theoretically exact point, axis, or plane from which dimensions are referenced.
True
False
Match the GD&T symbol with its corresponding geometric characteristic.
10. ☐ (Square)
a. Flatness
11. ⌖ (Concentricity)
b. Position
12. ⊥ (Perpendicularity)
c. Concentricity
13. < (Angularity)
d. Perpendicularity
14. ⌴ (Cylindricity)
e. Angularity
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