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James D. Meadows © March, 2009
160 pages, softcover, illustrated
ISBN: 0-9714401-8-2
Publisher Price: $89
'NEW RULES’ in GD&T [per ASME Y14.5-2009] is based on the ASME Y14.5-2009
Dimensioning and Tolerancing Standard.
This 160-page book reflects new symbology, rules and basic principle
revisions that took the Y14.5 committee almost 15 years to complete. It
shows how to interpret design drawings and CAD representations of product
definitions that use the items that have changed from the ASME Y14.5M-1994
to ASME Y14.5-2009 Standard. It also explains each rule and symbol change
and shows how to apply and interpret the new Y14.5 practices that will allow
dimensioning and tolerancing professionals to express their design
requirements more clearly. The results of these changes are that: product
representations are able to be more specific in conveying tolerancing needs,
products can be more easily manufactured, and appropriate inspection
techniques are clarified.
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... |
