What the attendees will learn
A survey of the drafting rules and guidelines contained in the Standard.
What GDT is and why to use it.
Definitions.
The important ground rule that controls relationships among features.
The limits of size including RULE NO. 1 and the ENVELOPE PRINCIPLE.
All about and when to use RULE NO. 2 concerning the material conditioning modifiers of MMC, LMC and the assumed RFS.
The designation of features when tolerancing screw threads, gears and splines.
All the GDT symbols.
All about datums: Their terminology/ Primary, secondary and tertiary/ The theoretical datum plane/ The datum reference frame/ How many are needed/ Datums of size and how they are simulated/ How datums are selected/ The separate and simultaneous datum requirements.
The tolerances of location: Positional, Composite Positional, Coaxial Positional, Symmetry Positional, Concentricity and Symmetry/ The various tolerance zone shapes/ The zero tolerance at MMC or LMC concept/ The projected tolerance zone/ How position tolerances are determined/ Floating and fixed fastener tolerancing/ The BOUNDARY concept.
The form tolerances: Straightness of surface elements/ Straightness of an axis and its allowable violation of the envelope principle/ Straightness per unit length with specified total/ Straightness of flat surfaces in opposite directions with different tolerances/ Flatness/ Flatness per unit area with specified total/ Circularity (roundness)/ Cylindricity (roundness plus surface straightness).
The profile tolerances: Profile of Surfaces and Profile of Lines/ Profiling portions of surfaces or lines/ The various constructions of the profile tolerance zone/ Profile as a refinement of size/ Profiling to control coplanarity/ Composite profile.
The orientation tolerances: Angularity, Parallelism and Perpendicularity/ The 4 ways each are applied/ The TANGENT PLANE concept/ Application of the projected tolerance zone.
The runout tolerances: Circular Runout and Total Runout/ Their relationship to the dial indicator/ All the types of features that use Runout tolerances/ Form control to refine Runout.
Free State Variation and when and how to use it in the documentation and inspection of flexible or otherwise unstable parts.
Comparison of the 1982 and 1994 revisions of the GDT Standard.
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