# Basics of Geometric Dimensioning and Tolerancing 140

This class introduces the symbols and interpretation of geometric tolerancing as described in the ASME Y14.5M-1994 standard.

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## Class Details

Class Name:
Basics of Geometric Dimensioning and Tolerancing 140
Description:
This class introduces the symbols and interpretation of geometric tolerancing as described in the ASME Y14.5M-1994 standard.
Version:
1.0
Difficulty:
Beginner
Number of Lessons:
21
Spanish

## Class Outline

• Objectives
• Geometric Dimensioning and Tolerancing
• Geometric Tolerancing vs. Limit Dimensions
• Geometric Characteristics
• Feature Control Frame
• Material Condition Modifiers
• Straightness
• Flatness
• Circularity
• Cylindricity
• Profile of a Line
• Profile of a Surface
• Angularity
• Perpendicularity
• Parallelism
• Position
• Concentricity and Symmetry
• Circular Runout and Total Runout
• The Most Common Characteristics
• Interpreting Geometric Characteristics
• Summary

## Objectives

• Define geometric dimensioning and tolerancing.
• Distinguish between geometric tolerancing and limit dimensions.
• Identify the groups of geometric characteristics.
• Describe the contents of the feature control frame.
• Define the material condition modifiers.
• Describe the straightness tolerance.
• Describe the flatness tolerance.
• Describe the circularity tolerance.
• Describe the cylindricity tolerance.
• Describe the profile of a line tolerance.
• Describe the profile of a surface tolerance.
• Describe the angularity tolerance.
• Describe the perpendicularity tolerance.
• Describe the parallelism tolerance.
• Describe the position tolerance.
• Describe the concentricity tolerance.
• Describe the symmetry tolerance.
• Describe the circular runout tolerance.
• Describe the total runout tolerance.
• Identify the most common tolerances.
• Describe the application of tolerances.

## Glossary

Vocabulary Term Definition
angularity A three-dimensional orientation tolerance that describes the allowable variability in the angular relationship between a surface and a datum.
ASME Y14.5M-1994 The Dimensioning and Tolerancing standard.
circular runout A two-dimensional runout tolerance that describes the distance between the surface and axis of a circular feature.
circularity A two-dimensional form tolerance that describes the allowable variability in the shape and appearance of a circle in a section view.
coaxial Sharing the same axis.
concentricity A three-dimensional locational tolerance that describes the location of opposing points in cylindrical features with respect to a datum reference.
cylindricity A three-dimensional form tolerance that describes the allowable variability in the shape and appearance of a cylinder.
datum A specified point, line, or plane that acts as a point of reference for a feature.
datum reference frame The combination of points, lines, and planes that define three dimensions for a part.
feature control frame The box that contains the geometric tolerancing requirement information for one condition of the part.
flatness A three-dimensional form tolerance that describes the allowable variability in the shape and appearance of a surface that lies in a plane.
form tolerance A group of geometric characteristics that describes the shape of the feature.
geometric characteristic The mathematical specification applied to a feature.
geometric dimensioning and tolerancing A three-dimensional tolerancing system that describes a feature and its relationships in mathematical language.
least material condition The circumstance of the feature with the least material during which the geometric tolerance applies.
limit tolerancing A two-dimensional tolerancing system that describes a feature in absolute maximum and minimum dimensions.
location tolerance A group of geometric characteristics that describes the placement of features on the part.
material condition modifier The circumstance of the feature during which the geometric tolerance applies.
maximum material condition The circumstance of the feature with the most material during which the geometric tolerance applies.
orientation tolerance A group of geometric characteristics that describes the angular relationship between features.
parallelism A three-dimensional orientation tolerance that describes the equal distance between pairs of points, lines, or planes.
perpendicularity A three-dimensional orientation tolerance that describes the allowable variability in the 90 degree angular relationship between a surface and a datum.
position A three-dimensional location tolerance that describes the exact location with respect to a datum reference.
profile of a line A two-dimensional profile tolerance that describes the allowable variability in the contour of the edge seen in the section view.
profile of a surface A three-dimensional profile tolerance that describes the allowable variability in the contour of a surface.
profile tolerance A group of geometric characteristics that describes the appearance from the two-dimensional section view.
regardless of feature size The circumstance of the feature with any amount of material, for any size, during which the geometric tolerance applies.
runout tolerance A group of geometric characteristics that describes surfaces around an axis.
straightness A two-dimensional form tolerance that describes allowable variability in the shape and appearance of a line in a section view.
symmetry A three-dimensional locational tolerance that describes the location of opposing points with respect to a datum reference.
tolerance The acceptable variation from a specified dimension.
tolerance zone The space created by the cushion of tolerance.
total runout A three-dimensional runout tolerance that describes the distance between a surface and axis.