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‘NEW RULES’ in
GD&T |
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| This ‘NEW RULES’ in GD&T [per ASME Y14.5-2009] textbook and
workbook/answerbook was written to highlight the revised concepts
covered in ASME Y14.5-2009 as well as to explain some of the more
difficult and advanced concepts allowed by, but perhaps not
thoroughly explained, in the previous Y14.5 standard. This book is
not meant to replace the 574 page textbook by James D. Meadows
entitled Geometric Dimensioning and Tolerancing - Applications,
Analysis & Measurement [per ASME Y14.5-2009] but, instead, to
showcase only the topics and symbology that have changed from
Y14.5-1994 toY14.5-2009. Text-Workbook/Answerbook Contents: New Symbols A Few Basic Definitions, Formulas & Guidelines New Rule Regarding the Use of the Symbol New Terms for Existing Concepts: MMB, LMB and RMB Derived Median Plane and Derived Medial Line Actual Mating Envelope New Alternative Practice regarding the Use of the Angularity Symbol New General Rules Theoretical (Perfect Datum Feature Simulators ‘Perfect Form at MMC is Required for All Rigid Features’ gets a New Exception Circularity to Control Spherical Diameters Unilateral or Unequal Symbol New Symbol for Profile of a Surface All-Over Tolerance Zones Profile of a Surface All-Over Control Illustration of the Tolerance Zone Configuration An Example of a NON-UNIFORM Profile of a Surface Tolerance Zone Composite Profile vs. Two Single Segment Profile Controls An Extension of the Composite Profile of a Surface Concept—Three Levels of Control Continuous Feature Symbol of Size New Datum Features and Datum Feature Categories and What They Mean Conical Datum Feature Curved Surface as a Datum Feature Datum Feature Patterns Designating Degrees of Spacial Freedom Specifying Degrees of Freedom in the Feature Control Frame Multiple Datum Reference Frame Identification Specifying the Desired Datum Material Boundary with a Number Correct Maximum Material Boundary Calculations Using the Translation Modifier Using ‘BASIC’ or its Abbreviation ‘BSC’ in a Feature Control Frame BSC instead of BASIC Datum Feature Implied at Regardless of Material Boundary (RMB) Datum Features Referenced in Maximum Material Boundary (MMB) More Examples on Different Part Configurations Irregular Datum Feature of Size Repetitive Patterns New Rules and Symbols for Datum Targets New Rule for Secondary and Tertiary Datum Features of Size Positional Boundary Concept Elongated Holes with Bi-directional Positional Tolerances Positional Boundary Concept used on Hoses, Pipes and Tubes D-Shaped Holing using Profile and the Positional Boundary Concept Positional Boundary – Amorphous Workpiece and Gage Composite Positional Tolerancing vs. Two Single Segment Positional Tolerancing Composite Tolerancing with Three Levels of Control Projected Tolerance Zone (A Change or Not a Change?) Also see: ‘NEW RULES’ in GD&T [per ASME Y14.5-2009) DVD Training Series... |
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If you have any questions about GD&T training, books, workbooks, tests or DVDs, please reach out to James D. Meadows & Associates, Inc., at (615) 924-3600.
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(615) 924-3600
