G3 – Basic GD&T + Tolerance Stack-Up

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*Each section involves practice of calculation and application of geometric tolerances.

Engineering Drawing and GD&T

  • Engineering Drawings
  • Introduction to Dimensioning
  • Dimensioning Rules
  • Co-Ordinate Dimensioning System
  • Geometric Dimensioning and Tolerancing system Myths in GD&T

Definitions and Symbols

Rules and Different concepts of GD&T

  • Limit of size
  • Brief of Rule#1
  • Brief of Rule#2
  • Application of MMC and
  • Bonus Tolerance

Tolerance selection

From Tolerance

  • How to select Form Tolerance
  • Straightness tolerance
  • Flatness tolerance
  • Circularity
  • Cylindricity tolerance

Datum selection

  • How to select Datum
  • Datum feature
  • Datum identification
  • Planar datum
  • Datum feature of RMB
  • Maximum Material boundary
  • Least material boundary
  • Datum shift
  • Datum targets
  • Simultaneous requirement

Positional Tolerance

  • How to select Datum
  • Tolerance of location-positional tolerance
  • Positional tolerance-RFS
  • Positional tolerance -MMC
  • Positional tolerance-LMC
  • Brief of Multiple segment and composite tolerance
  • Application of projected tolerance zone
  • Simultaneous requirement
  • Positional coaxial control
  • Concentricity
  • Symmetrical relationship

Tolerance of profile

  • Profile tolerance
  • Uniform profile tolerance zone
  • Bilateral tolerance
  • Unilateral and unequal bilateral
  •  All around and all over symbols
  • Different tolerance for different segment of cross section
  • Brief of Non uniform tolerance zone
  • Brief of Composite Tolerance application
  • Application of profile tolerance

Orientation tolerance

  • Orientation tolerances
  • Angularity
  • Parallelism
  • Perpendicularity
  • Tolerance zone for orientation tolerance
  • Orientation tolerance @MMC modifier
  • Projected tolerance

Runout tolerance

  • Tolerance of Runout
  • Datum section for Runout
  • Circular runout
  • Total runout
  • Application of circular runout on a curved surface

Tolerance

  • What, Why
  • Limits- Fits and Tolerances
  • Precision and Accuracy
  • Various Fits

Tolerance Stack-up

  • Myths in Tolerance Stack-up
  • What is tolerance Stack-up Analysis?
  • Why to do tolerance Stack-up Analysis?
  • Benefits tolerance Stack-up Analysis
  • What are the driving factors in Stack-up analysis
  • Assumptions and ways of doing stack-up
  • Steps to be followed
  • Rules preparing Loop diagram

Converting all tolerancing system to equal bilateral system

Examples Practice (Part Level and Assembly Level)

Fixed and Floating Formulas and Concept

Converting GD&T to Normal ± tolerance to use in stack-up analysis

  • Few terminologies (VC, RC, OB and IB, Datum shift)
  • Form Tolerances – To include in Tolerance stack-up or not
  • Orientation Tolerances on surface and on feature of size
  • Profile (Composite tolerance effect as well)
  • Positional Tolerance (Composite tolerance, when and how to include segments)
  • Datum shift assumption in Tolerance Stack-up
  • Runout Consideration
  • Symmetry and Concentricity

Radial Tolerance Stack-up

Part With Dimension and tolerance at an angle

Statistical Tolerancing (RSS and MRSS)

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