Complimentary slides to Chris Monnier at Boston Scientific

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Complimentary slides to Chris Monnier at Boston Scientific
International Institute of GD&T Precision GD&T: Complimentary slides to Chris Monnier at Boston Scientific Dr. Greg Hetland, President International Institute of GD&T

Plus / Minus Tolerancing
This method of tolerancing allows the axis of the hole to move plus something and minus something in the X and Y direction. This creates a square tolerance zone in which the holes must lie? 4X  25  0.1 0.1 0.1 50  0.1

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. 4X   Position Symbol Diameter Symbol Total Tolerance 25 50

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 

Profile Comparison to Linear…

Tolerancing Consideration #1
20.02 20.06 20.1 20.14 20.04 20.08 20.12 20.16 20.18 20.22 20.26 20.2 20.24 20 19.74 19.78 19.82 19.86 19.76 19.8 19.84 19.88 19.9 19.94 19.98 19.92 19.96 0.1 0.06 0.02 0.12 0.08 0.04 0.14 0.24 0.2 0.16 0.26 0.22 0.18 Virtual Condition MMC LMC 20±0.2        20±0.2        Only in Diagonals

Tolerancing Consideration #5
                  20.02 20.06 20.1 20.14 20.04 20.08 20.12 20.16 20.18 20.22 20.26 20.2 20.24 20 19.74 19.78 19.82 19.86 19.76 19.8 19.84 19.88 19.9 19.94 19.98 19.92 19.96 0.1 0.06 0.02 0.12 0.08 0.04 0.14 0.24 0.2 0.16 0.26 0.22 0.18 Virtual Condition MMC LMC         20±0.2 20±0.2

GD&T Boundary Comparisons               Orientation Form
Angularity Perpendicularity Form Straightness Parallelism Location Flatness Position Circularity Concentricity Cylindricity Symmetry Profile Runout Profile of a Surface Circular Runout Profile of a Line Total Runout

Global Simplification of GD&T
Flatness 3D Surface Control Angularity Perpendicularity Parallelism Profile of a Surface Cylindricity Total Runout Concentricity Symmetry 2D Surface Control Straightness Circularity Profile of a Line Circular Runout Axis Control Straightness Angularity Perpendicularity Parallelism Position Concentricity Symmetry

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