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What is the definition of ASME?

The American Society of Mechanical Engineers. ASME is an organization that publishes technical materials and sets industrial and manufacturing standards.
Learn more about ASME in the class "Intro to GD&T 200" below.

Intro to GD&T 200

Inspection Training

Class Information

Tooling U classes are offered at the beginner, intermediate, and advanced levels. The typical class consists of 12 to 25 lessons and typically requires at least two hours of instruction time.

Class Name:	Intro to GD&T 200
Description:	This class introduces the fundamental concepts of geometric dimensioning and tolerancing (GD&T) and describes the main types of tolerances included in the standard. Includes an Interactive Lab.
Prerequisites:	350110 800130
Difficulty:	Intermediate
Number of Lessons:	20

Below are all the competencies and job programs that contain the class Intro to GD&T 200. Job programs are our traditional class lists organized according to common job functions. Competences are our latest job-specific curricula that help tie online learning to practical, hands-on tasks.

Click on any title to view its details.

Competencies	Show All
CNC Lathe Operator CNC Machinist CNC Mill Operator

Job Programs	Show All
Job: Assembler Job: Assembler: Electrical Job: CNC Operator: Mill

Class Outline

Objectives
What Is GD&T?
Background of GD&T
Datums and Features
GD&T vs. Coordinate Tolerancing
The Datum Reference Frame
The Order of Datums
Types of Tolerances
Straightness and Flatness
Circularity and Cylindricity
Profile of a Line and Surface
Angularity, Perpendicularity, and Parallelism
Position
Concentricity and Symmetry
Circular and Total Runout
Material Condition Modifiers
Bonus Tolerance
The Feature Control Frame
Advantages of GD&T
Summary

Class Objectives

Define GD&T.
Describe the scope of GD&T standards.
Distinguish between a datum and a feature.
Distinguish between traditional tolerancing and GD&T.
Define the datum reference frame.
Describe how the datum reference frame and the part are related.
List the major categories of geometric tolerances.
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.
List the material condition modifiers.
Describe how bonus tolerance is applied to a hole.
List the contents of the feature control frame.
Describe the advantages of GD&T.

Class Vocabulary
angle plate		A precise measurement device used to establish an accurate 90° vertical surface.
angularity		A three-dimensional geometric tolerance that controls how much a surface, axis, or plane can deviate from the angle described in the design specifications.
ASME		The American Society of Mechanical Engineers. ASME is an organization that publishes technical materials and sets industrial and manufacturing standards.
bonus tolerance		Additional tolerance that applies to a feature as its size shifts from a stated material condition. Both MMC and LMC allow bonus tolerance.
circular runout		A two-dimensional geometric tolerance that controls the form, orientation, and location of multiple cross sections of a cylindrical part as it rotates.
circularity		A two-dimensional geometric tolerance that controls how much a feature can deviate from a perfect circle.
concentric		Sharing the same center.
concentricity		A three-dimensional geometric tolerance that controls how much the median points of multiple diameters may deviate from the specified datum axis.
coordinate tolerancing		A system for describing the design of a part that compares its features to distances along three linear axes. These axes create an imaginary rectangular grid.
cross section		A section of a feature that is formed by an intersecting imaginary plane.
cylindricity		A three-dimensional geometric tolerance that controls how much a feature can deviate from a perfect cylinder.
datum		An imaginary, perfect geometric shape or form. A perfect point, line, flat plane, circle, or cylinder are all examples of possible datums.
datum feature		A physical feature that acts as an acceptable substitute for a datum. Datum features relate the various features of the part to each other.
datum reference frame		Three imaginary planes perpendicular to one another that are mapped onto the part to relate features to each other.
feature		A physical feature of a part that naturally contains variation and imperfections. A corner, edge, flat surface, or hole are all examples of possible features.
feature control frame		A series of compartments containing symbols and values that describe the tolerance of a feature. The order and purpose of these compartments follow a consistent standard.
fixture		A dedicated workholding device used to locate and hold a part during machining or inspection.
flatness		A three-dimensional geometric tolerance that controls how much a feature can deviate from a flat plane.
form tolerance		A group of geometric tolerances that limit the amount of error in the shape of a feature. Form tolerances are independent tolerances.
functional gage		A gage for a specific part that quickly checks its form and fit in a manner similar to its intended use.
geometric dimensioning and tolerancing		An international standard for communicating instructions about the design and manufacturing of parts. GD&T uses universal symbols and emphasizes the function of the part.
granite surface plate		A precise, flat plate made of granite that is used to establish a datum plane for inspection. Granite surface plates are available in standardized grades.
individual tolerance		A tolerance that does not require a specified datum.
ISO		The International Organization for Standardization. ISO is an organization based in Switzerland that develops and publishes standards for its international membership base.
least material condition		The point at which a feature contains the least amount of material within its acceptable size limit. The largest acceptable hole and the smallest acceptable shaft are examples of LMC.
location tolerance		A group of geometric tolerances that limit the location or placement of features. Location tolerances are related tolerances.
material condition modifier		One of three modifiers that further define the tolerance of a feature in relation to its acceptable size limits.
maximum material condition		The point at which a feature contains the greatest amount of material within its acceptable size limit. The smallest acceptable hole and the largest acceptable shaft are examples of MMC.
median point		A point that is exactly the same distance between two outer points.
orientation tolerance		A group of geometric tolerances that limit the direction, or orientation, of a feature in relation to other features. Orientation tolerances are related tolerances.
parallelism		A three-dimensional geometric tolerance that controls how much a surface, axis, or plane can deviate from an orientation parallel to the specified datum.
perpendicularity		A three-dimensional geometric tolerance that controls how much a surface, axis, or plane can deviate from a 90 degree angle.
position		A three-dimensional geometric tolerance that controls how much the location of a feature can deviate from its true position.
primary datum		The datum feature that first situates the part within the datum reference frame. The primary datum is the first feature to contact a fixture or surface during assembly.
profile		The outline of a part feature within a given plane.
profile of a line		A two-dimensional geometric tolerance that controls how much the outline of a feature can deviate from the true profile.
profile of a surface		A three-dimensional geometric tolerance that controls how much a surface can deviate from the true profile.
profile tolerance		A group of powerful geometric tolerances that control the size, location, orientation, and form of a feature. Profile tolerances can be either independent or related.
regardless of feature size		A modifier indicating that the stated tolerance for a feature applies regardless of its actual size within an acceptable size limit. RFS does not permit bonus tolerance.
related tolerance		A tolerance that requires a specified datum.
roundness measuring machine		A sophisticated inspection device with a precision spindle that measures various circular or cylindrical features.
runout tolerance		A group of geometric tolerances that simultaneously limit the form, location, and orientation of cylindrical parts. Runout tolerances are related tolerances requiring a datum axis.
secondary datum		The datum feature that situates the part within the datum reference frame after the primary datum. The secondary datum is the second feature to contact a fixture or surface during assembly.
straightness		A two-dimensional geometric tolerance that controls how much a feature can deviate from a straight line.
symmetry		A three-dimensional geometric tolerance that controls how much the median points between two features may deviate from a specified axis or center plane.
tertiary datum		The datum feature that situates the part within the datum reference frame after the secondary datum.
three-dimensional tolerance		A tolerance that controls a shape having a length, width, and depth.
tolerance		An unwanted but acceptable deviation from a given dimension. Tolerances indicate the allowable difference between a physical feature and its intended design.
tolerance zone		An imaginary zone in which a part feature must be completely contained for the part to pass inspection.
total runout		A three-dimensional geometric tolerance that controls the form, orientation, and location of the entire length of a cylindrical part as it rotates.
true position		The imaginary perfect position of a feature described by the design specifications.
true profile		The perfect, imaginary profile described by the design specifications.
two-dimensional tolerance		A tolerance that controls a shape having only a length and width.