Geometric Dimensioning And Tolerancing

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Private Class from


(2 Days)


Upon completion of this programme, participants will be able to:

  • Know the four major geometric characteristics, the five family geometric controls that consist of fourteen elements and the simple four steps to apply GD&T.
  • Understand types of features either regular or irregular that will decide which geometric tolerance is suitable to attach to the feature.
  • Understand the contents of a feature control frame that are used as geometric control of the feature.
  • Understand product designers' count on these geometric controls to provide design assurance that the product will have the appropriate fit, form, function, and/or reliability. Understand geometric tolerance symbols used to specify the functional relationship between or within part features and have specific rules about them that have a direct bearing on how the part must be inspected and produce.
  • Understand datum that are the starting point for the measurement and a specific description of the tolerance zone in order for observer to decide if the product is within or out of specification, and manufactures to produce products according to designer intention.
  • Understand a variety of inspection and gauging equipment, and finding the appropriate measuring or gauging method that will properly evaluate the part feature being controlled.
  • Understand contents and requirement of various type of feature control frames used to control geometrical of the features. The feature control frames include multi-segment and composite.
  • Understand certain importance terms, such as:
    • Size - the overall dimensions are as specified
    • Form - the shapes specified must have the correct geometrical form
    • Fit - two parts must match as specified
    • Function - the product conforms to performance specification
    • Reliability - the product performing its intended function under stated conditions without failure for given a period of time.
    • Interchangeability - the part able to replace without doing any modification.
  • Understand the application of the modifiers, it helps to improve and accept more functional parts by maximize the tolerances that will increase productivity.
  • Understand GD&T system with complete specification of design requirements are possible with symbols that allow the designers to specify maximum tolerances for parts that must assemble with other parts and ensure the interchangeability of parts. These complete specifications that are becoming increasingly important with the growing interrelated ownerships of companies around the world.
  • Able to use modifiers for certain application condition, especially the maximum material condition (MMC) which provides extra tolerance for manufacturing that based upon its reasonable functional requirements. Features which can be implied with MMC, functional gauge are applicable; that is an advantage for mass production inspection.
  • Determine the feature size limits that are based on the material condition and actual feature size, and able to determine the virtual condition size when the feature is implied with MMC.
  • Justify product acceptance for the geometrics control indicated by either single segment or multi-segment or composite feature control frame.
  • Demonstrate Proficiency in requirements for the drawing with GD&T system.
  • Increase interest of using GD&T system for easy and complete communications with others.


This program is suitable for designers & drafting personnel, tool makers, machinists, engineers, inspectors and others required to interpret or apply GD&T. It will greatly help companies striving to obtain QS-9000/TS16949 certification and those who need to meet GD&T requirements.


This stimulating program will maximize understanding and learning through training slides, demo kits, review questions, exercises, case studies, Q&A session and tests.

  • Objective
  • History And Evolution
  • What Is GD&T?
  • The Importance Of Standards
  • Why GD&T
  • The Advantage Of GD&T On Acceptance Of Parts
  • Pertinent Definitions
  • Attachment Of Feature Control Frames
  • Multi Single-Segments Feature Control Frames
  • Composite Feature Control Frames
  • The Application Of GD&T
  • Review Questions
  • Geometric Tolerance
  • Tolerance Zones
  • Tolerance Zone Modifiers
  • Statistical Tolerance
  • Bonus Tolerance
  • Restrained Features
  • Virtual Condition
  • MMC, LMC, RFS And Virtual Condition
  • Control Wall Thickness By Using LMC
  • Review Questions
  • Rule1: Regarding Size Tolerances
  • Rule 2: Regarding Tolerance Modifiers
  • Rule 3a: Pitch Diameter Rule
  • Rule 3b: Gears And Splines
  • Rule 4: Datum Features At Virtual Condition Rule
  • Review Questions
  • Geometric Characteristics Symbols
  • Modification Symbols
    • Tolerance Zone Modifiers
    • Bonus Tolerances
    • MMC, LMC And RFS
  • Feature Control Frames Symbols
  • Other Symbols Used In GD&T
  • New Symbols Of ASME Y14.5m-2009
  • Review Questions

  • Introduction
  • Datum Identification Symbols
  • What Is Datum?
    • Datum Feature Symbols
    • Three Plane Concepts
    • Datum Target
    • Datum Of Size
    • Datum Of Features Patterns
  • Establishing Datum
    • Datum Feature Simulator
    • Datum Surface (Feature)
    • Datum Feature Of Size
  • Datum Target
    • Datum Target Symbol
    • Datum Target-Point
    • Datum Target-Line
    • Datum Target-Area
    • Datum Targets-Complex Or Irregular Surfaces
  • Datum At MMC
  • Co-Datum
  • Feature Of Size Datum Precedence
  • Review Questions
  • Introduction
  • Flat Surface
    • Straightness
    • Flatness
  • Round Surface
    • Transverse
    • Circularity
    • Cylindricity
    • Longitudinal
    • Surface Straightness
    • Axis Straightness
  • Review Questions
  • Introduction
  • Parallelism
  • Perpendicularity
  • Angularity
  • Review Questions
  • Introduction
  • Concentricity
  • Symmetry
  • Position
  • Review Questions
  • Introduction
  • Profile Tolerances
    • Symbol
    • Definition
    • Tolerances
    • Application
    • Boundary Control For Non-Cylindrical Features
    • Profile Of A Line
    • Profile Of A Surface
  • Runout Tolerance
    • Symbol
    • Definition
    • Tolerances
    • Application
    • Circular Runout
    • Total Runout
  • Review Questions
  • 50 Objective Questions
  • Technical Drawing
  • Geometric Dimensioning And Tolerance