Engineering & Design: Geometric Dimensioning SECTION 5

5-1 NADCA Product Specifi cation Standards for Die Castings / 2006 Engineering & Design: Geometric Dimensioning5 SECTION5 SECTION ContentsNADCA Introduction 5-22 What is GD&T?5-23 Why Should GD&T be Used?5-34 Datum Reference Frame5- , Secondary, Tertiary Features & Feature Vs. Datum Plane Vs. Datum Target Sizes & Locations5-65 Feature control Frame5-66 Rule #1 Taylor Principle (Envelope Principle)5-77GD&T Symbols/Meanings5-88 Material Material Condition (MMC) Material Condition (LMC) of Feature Size (RFS)5-109 Location & Symmetry Tolerances5-1310 Profi le Tolerance5-1411 Run Out Tolerances5-1812 Orienta t ion Tolerances5 -1913 Form Tolerances5 S t ra igh t n e s s5 -2113. 2 Fl a t n e s s5 Circulatity (Roundness)5-2313. 4 Cy l i n dr ic i t y5 -2314 Conversion Charts5 Conversion of Position (Cylindrical) Tolerance Zones to/from Coordinate Tolerance Conversion of Position Tolerance Zone to/from Coordinate Tolerance Conversion of Coordinate Measurements to Position Location Measurements5-335-2 NADCA Product Specifi cation Standards for Die Castings / 2006 Engineering & Design: Geometric Dimensioning1 IntroductionThe concept of Geometric Dimensioning and Tolerancing (GD&T) was introduced by Stanley Parker from Scotland in the late 1930 s.

5 Feature Control Frame 5-6 6 Rule #1 – Taylor Principle (Envelope Principle) 5-7 ... NADCA Product Specifi cation Standards for Die Castings / 2006 5-3 Engineering & Design: Geometric Dimensioning ... The letter identi-fi es the datum feature that is to be contacted however the letter in the FCF is the datum plane or axis of the datum ...

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