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© IIGDT – GD&T Introduction & Fundamental Principles - May 28, 2006 Dr. Greg Hetland, President International Institute of GD&T www.iigdt.com Precision.

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Presentation on theme: "© IIGDT – GD&T Introduction & Fundamental Principles - May 28, 2006 Dr. Greg Hetland, President International Institute of GD&T www.iigdt.com Precision."— Presentation transcript:

1 © IIGDT – GD&T Introduction & Fundamental Principles - May 28, 2006 Dr. Greg Hetland, President International Institute of GD&T Precision GD&T: Complimentary slides to Chris Monnier at Boston Scientific International Institute of GD&T

2 © IIGDT – GD&T Introduction & Fundamental Principles - May 28, 2006 This method of tolerancing allows the axis of the hole to move plus something and minus something in the X and Y direction. 50   0.1 4X  Plus / Minus Tolerancing 0.1 This creates a square tolerance zone in which the holes must lie?

3 © IIGDT – GD&T Introduction & Fundamental Principles - May 28, 2006 Linear Transformation to GD&T Geometric Dimensioning & Tolerancing (GD&T) creates cylindrical tolerance zones by removing the tolerance from the dimensions and applying it to the features. In this example, the geometric control is position. Dimensions are basic boxed, theoretically exact, with no tolerance Position Symbol Total Tolerance Diameter Symbol 4X  

4 © IIGDT – GD&T Introduction & Fundamental Principles - May 28, 2006 Feature Control Frame    Geometric Characteristic Diameter Symbol Feature Tolerance Feature Modifier Projected Tolerance Zone Symbol Height of Projected Tolerance Zone Primary Datum Secondary Datum Datum Modifier Tertiary Datum

5 © IIGDT – GD&T Introduction & Fundamental Principles - May 28, 2006 Profile Comparison to Linear… Profile Linear

6 © IIGDT – GD&T: Advanced Applications & Analysis – June 25, ±0.2 0               0 0        20±0.2 0      0 0                 Tolerancing Consideration #1  Only in Diagonals

7 © IIGDT – GD&T: Advanced Applications & Analysis – June 25, ±     0 0            0 0      Tolerancing Consideration #5                                      

8 © IIGDT – GD&T: Advanced Applications & Analysis – June 25, 2006 GD&T Boundary Comparisons               Form Profile Orientation Location Runout Straightness Flatness Circularity Cylindricity Profile of a Surface Profile of a Line Angularity Perpendicularity Parallelism Position Concentricity Symmetry Circular Runout Total Runout

9 © IIGDT – GD&T: Advanced Applications & Analysis – June 25, 2006 Global Simplification of GD&T   Profile of a Surface Profile of a Line 3D Surface Control 2D Surface Control Axis Control  Position  Flatness    Angularity Perpendicularity Parallelism    Angularity Perpendicularity Parallelism  Straightness   Circularity  Cylindricity  Circular Runout  Total Runout  Symmetry   Concentricity 

10 © IIGDT – GD&T: Advanced Applications & Analysis – June 25, 2006 GD&T Training Deployment Guide Customers Individuals who need to understand terminology & graphical representation of an engineering drawing. Sales & Purchasing Beginning Operators & Technicians Course I Machinists Tool Makers Senior Inspectors Senior Technicians Engineers: Associate Engineers Engineers Senior Engineers Principal Engineers Fellow Engineers Course III Drafters Inspectors Machine Operators Technical Managers Technicians: Associate Technicians Technicians Course II Supplier Technicians Supplier Engineers Receiving Inspectors Rec. Inspection Techs. Measurement Engineers Suppliers Purchasing Machine Operators Process Technicians Process Engineers Measurement Technicians Measurement Engineers Quality-Technicians Quality-Engineers Inspectors Drafters Designers Engineers Machine Operators Machinists Tool Makers Exec. Level Manufacturing Quality/Measurement Design Tool Room Administration Engineers Sales/Applications Sales Executives Course 1: Basic Blueprint Reading Course 2: GD&T - Introduction & Fundamental Principles Course 3: GD&T – Advanced Applications & Analysis

11 © IIGDT – GD&T: Advanced Applications & Analysis – June 25, 2006 Basic Blueprint Reading (1-day) To understand basic components, sections, views, terminology and graphical representation of an engineering drawing. GD&T- Introduction & Fundamental Principles (2-day) To provide fundamental lessons in proper interpretation of engineering drawings used in the design, manufacture and inspection of parts which have geometric controls applied per ANSI Y14.5M-1982 and ASME Y14.5M GD&T- Advanced Applications & Analysis (2-day) To provide advanced information in "applications and analysis“ (per ASME Y14.5M-1994 and ASME Y14.5.1M-1994) involving optimization strategies for given design applications, manufacturing methodologies and measurement implications. IIGDT Public & In-House Courses Public seminars scheduled quarterly at the University of Minnesota 50% Discount to Students and Professors See for details

12 © IIGDT – GD&T: Advanced Applications & Analysis – June 25, 2006 GD&T GUIDE Charts ($12 each) available on-line at or calling IIGDT at or sending and to:

13 © IIGDT – GD&T: Advanced Applications & Analysis – June 25, 2006 GD&T Fonts ($49 each) available by calling IIGDT at or sending and to:


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