Transcription of Engineering & Design: Geometric Dimensioning SECTION 5
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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.
Engineering & Design: Geometric Dimensioning 1 Introduction The concept of Geometric Dimensioning and Tolerancing (GD&T) was introduced by Stanley Parker from Scotland in the late 1930’s. However it was not used to any degree until World War II (WW II) because until then the vast majority of products were made in-house. The designer
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