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GD&T Trainer: ASME Standard Comparison

ASME Y14.5M-1994 to Y14.5-2009 

Goals and Objectives

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Lesson 1: Revised Terms
Goal: 24 terms revised from the 1994 standard.

  • Dimension
  • Basic dimension
  • Feature
  • Feature axis
  • Feature center plane
  • Actual local size
  • Feature of size
  • Least material condition
  • Maximum material condition
  • Regardless of feature size
  • True position
  • True profile
  • Derived median plane
  • Derived median line
  • Actual mating envelope
  • Virtual condition
  • Resultant condition
  • Datum
  • Datum axis
  • Datum center plane
  • Datum feature
  • Simulated datum
  • Datum feature simulator
  • True geometric counterpart

Lesson 2: New Terms
Goal: Recognize eighteen new terms added to the 2009 standard.

  • Complex feature
  • Regular feature of size
  • Irregular feature of size
  • Constraint
  • Free state
  • Restraint
  • Pattern
  • Unrelated actual mating envelope
  • Related actual mating envelope
  • Actual minimum material envelope
  • Unrelated actual minimum material envelope
  • Related actual minimum material envelope
  • Least material boundary (LMB)
  • Maximum material boundary (MMB)
  • Regardless of material boundary (RMB)
  • Datum feature shift / displacement
  • Datum feature simulator (theoretical)
  • Datum feature simulator (physical)

Lesson 3: Revised and New Rules
Goal: Recognize six rules revised from the 1994 standard and two new rules added to the 2009 standard.

  • Rule #1
  • Rule #2
  • Fundamental Rule 1.4(b)
  • Fundamental Rule 1.4(i)
  • Fundamental Rule 1.4(j)
  • Fundamental Rule 1.4(l)

Lesson 4: Revised and New Modifying Symbols
Goal: Understand Rule #1 and Rule #2.

Revised Modifying Symbols

  • Maximum material condition
  • Least material condition
  • Individually

New Modifying Symbols

  • Maximum material boundary (MMB)
  • Least material boundary (LMB)
  • Datum transition
  • Unequally disposed profile
  • Independency modifier
  • Continuous
  • All over symbol
  • Non-uniform
  • Spotface

Lesson 5: Revisions to the Datum System
Goal: Recognize the seven new datum system symbols used in the 2009 standard.

  • Movable datum target
  • Datum reference frame
  • Customized datum reference frame
  • Datum feature simulator RMB
  • Datum feature simulator BSC
  • Datum feature simulator MMB
  • Datum translation modifier

Lesson 6: Revisions to Form and Orientation
Goal: Recognize the seven revisions to the form and orientation controls in the 2009 standard.

Form Tolerances

  • Straightness
  • Flatness
  • Circularity
Orientation Tolerances

  • Angularity
  • Perpendicularity
  • Paralellism
Lesson 7: Revisions to Location Tolerances
Goal: Recognize the eight revisions to location tolerances in the 2009 standard.
  • Definition of position
  • True position
  • Position tolerance without datums
  • Position tolerance: INDIVIDUALLY
  • Position tolerance: zero at LMC
  • Composite position tolerance
  • Concentricity and symmetry
  • Circular and total runout

Lesson 8: Revisions to Profile Tolerances
Goal: Recognize the nine revisions to the profile tolerances in the 2009 standard.

  • Profile definition
  • Profile tolerance definition
  • Complex feature
  • All over
  • Unequally disposed profile
  • Nonuniform
  • Composite profile tolerance
  • Individually
  • Profile combined with position

Lesson 9: Explicit Support of 3D Models
Goal: Recognize the eight revisions to the 2009 standard that support the use of 3D digital data sets.

  • Referncing ASME Y14.41-2003
  • Axonometric views
  • Feature
  • Datum feature simulator (physical)
  • Fundamental Rule 1.4(b)
  • Fundamental Rule 1.4(p)
  • Illustration of the coordinate system
  • Specification of basic dimensions

 



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This file last modified 07/16/13