Course Outline

Core Units 1-6

Unit 1: Introduction:

General overview, geometric characteristic symbols, rules, terms and definitions; Introduction to measurement principles, open set-up and Coordinate Measuring Machine (CMM)

Unit 2: Limits of Size:

Rule #1; Features with & without size; MMC and LMC; Why plus/minus tolerancing is confusing; The need for geometric tolerancing

Unit 3: How the Geometric System Works:

Introduction to the datum reference frame; Basic dimensions; Introduction to Position Tolerancing; Square vs Round tolerance zones; MMC, LMC, RFS modifiers; Introduction to Profile Tolerancing

Unit 4: The Datum Reference Frame:

Datums, datum features, true geometric counterparts; Holes, slots, shafts, tabs, widths as datum features; Connection between the theory and physical; Datum feature precedence; Constraining the 6 degrees of freedom; True geometric counterpart requirements; Partial datum features

Unit 5: Product Plans and Position Tolerancing Verification:

Difference between the product drawing, manufacturing process plan, and dimensional measurement plan; The engineering specification versus the inspection method; Verifying position with MMC and RFS modifiers; Intro to paper gage

Unit 6: Orientation Tolerances:

Perpendicularity, Parallelism, Angularity; Orientation as a refinement of location; Inspection reporting


Additional Units 7-14 for Customization

*Select topics below will be added to the core units to create a custom course and be most relevant to the participants’ job function. Not all units may be covered in a standard course. The level of instruction (basic, intermediate, advanced) will also be adjusted based on prior knowledge and learning abilities.

Unit 7: Virtual Condition and Material Boundary Modifiers:

Introduction to boundaries; Calculating virtual condition; Material boundary modifiers MMB, LMB, RMB; Calculating boundaries for datum features at MMB; Comparison between RMB and MMB; Simultaneous requirement; Calculating allowable datum feature shift; Paper gage calculations

Unit 8: Datum Targets and Irregular Surfaces:

Angled datum features; Contoured datum features; Datum targets for sheet metal; Datum targets for plastic parts; Datum targets for castings and calculations to machining; Free state and restrained condition

Unit 9: Advanced Datum Reference Frames:

Two datum features creating a single datum axis (common datum features: A-B); Coaxial holes as datum features; Hole patterns as datum features; Hole and slot design; Multiple datum reference frames

Unit 10: Form Tolerances:

Flatness, Straightness, Circularity, Cylindricity; Average diameter; Flatness per unit area

Unit 11: Advanced Profile Tolerances:

Profile of a surface and line; Sample application drawings; Unequal and unilateral tolerances; verification principles and measurement data reporting; Composite profile; Coplanarity

Unit 12: Advanced Position Tolerances:

Floating fastener formula; Fixed fastener formula; Position rectangular, conical, spherical tolerance zones; Position boundary; Continuous feature; Composite position tolerancing; Paper gage calculations

Unit 13: Coaxial and Runout Tolerances

Coaxial controls – Comparison of position, circular runout, total runout, concentricity, and profile

Unit 14: Practice drawings for GD&T application

Sheet metal Corner Bracket; Machined Flange Bearing; Tube Assembly; Powder Case Assembly; Link Assembly

Appendix A: Updates from ASME Y14.5-2009 (or 1994) to Y14.5-2018

Appendix B: Differences between ASME Y14.5 and ISO-GPS Standards

Visit the GeoTol Store