I'm not promoting - I'm just sharing a great resource I found for *visual* G&T tips and explanations: http://www.tec-ease.com/gdt-tips.htm
Here's a complete listing of the free tips at http://www.tec-ease.com/gdt-tips.htm :I am more visual than I am wordy in order to understand things. This is a goodie:
Does Run out Equal Concentricity?—Sort Of.
cheers, michelleActual Mating Envelope
Angularity
Angularity Does Not Locate Video Clip
ASME Y14.5-2009 Video Clip
Basic Dimensions
ASME Y14.41 - 2003
Boundaries
Centerlines
Circularity
Coaxiality Controls
Composite Tolerancing Video Clip
ConcentricityCircular Runout Video ClipCorporate Addendum Video Clip
Cpk
Cylindricity Inspection
DatumAuxiliary Datum Video Clip
Control of Datum Features Video Clip
Datum Reference Frame
Datum Shift
Datum versus Datum Feature Video Clip
Degrees of Freedom
Center Video Clip
Planer Video Clip
Spheres Video Clip
Orienting Datum Planes Video Clip
Patterns of Features
Primary Datum Feature Control
Primary Datum Surface Control
Referencing Itself
Repetitive Patterns
Selection
Selection Based on Function Video Clip
Selection - Sufficient in Size
Simultaneous Requirements Video ClipDirectly Toleranced Dimensions
Symbol Placement
Targets Video Clip
Drawing “Previews" Video Clip
Exact Constraint
Extensions of PrincipleFormed Tubes, Rods, Etc. Video ClipFeature of Size Video Clip
Feature Control Frame Video Clip
Features Have Axes Video Clip
Fixed and Floating Fasteners
Flatness
Free State
InspectionBoundariesLocation Tolerances
Flatness
General
Hard Gage Simulation
Normal to the Surface
Probe Size
MMC and LMC
Notes On Drawings
Orientation Video Clip
Origin Symbol
Parallelism
Pick Your GD&T Tools Wisely Video Clip
Patterns of FeaturesCreating PatternsPerpendicularity Video Clip
Pattern - Simultaneous Requirements
PositionBasic DimensionsProfile
Coaxial Control Video Clip
Composite
General
Composite
Location of Irregular Feature
Material Condition Modifiers
Oblique Holes
Single Segment
BoundariesRounding Numbers
Composite
Controlling Size and Form
Coplanarity Video Clip
Features of Size
General
Increases Tolerance
Inspection
Location of Irregular Feature
Location of Planes
Maximum Material Condition Video Clip
Profile vs Direct Tolerancing
Profile of a Line
Reporting Profile Inspection
Schedule of Tolerances
Surface Video Clip
Surface Tolerance
Tolerance
Unequal and Unilateral
RunoutCircular Runout Video ClipRules
Circular vs Total
Runout vs Concentricity
Total Runout
Rule 1 Video ClipSize
Don’t Be Tricky with GD&T Video Clip
Controlling FormSlots Video Clip
General
Inspection
Individual Control
Standards Revisions
StraightnessGeneralSymmetry/Position
Unit Basis
Tangent Plane
The GD&T Hierarchy PyramidProfile SideThreads
Feature of Size Side
MMCTolerances Video Clip
Projected Tolerance Zone
Wall Thickness
.
.