Download - Geometrical tolerances
Geometrical Tolerances
By Hassan Habib
Objectives
• Introduction to Dimensions
• Terminologies
• Important Fundamental Rules
• Basics about Dimensioning
• Dimensioning Features
• Introduction to Tolerances
• Applications
• Direct Tolerancing Methods
• Tolerance Expressions
• Tolerancing on various Features
Introduction to Dimensions
• About The Standard ASME Y14.5
• The need of Dimensions
• Historical Perspective
Introduction to Dimensions
• Terminologies
• Dimension (Basic, Reference)
• Geometric Tolerance
• Datum
• Feature
• Feature Control Frame
• MMC & LMC
Introduction to Dimensions
• Important Fundamental Rules
• Each dimension should have a tolerance
• It should fully define the geometry with no room left for assumptions or over definition
• The dimensions define the finished part, any processing required should be specified
• There should be only one interpretation of every dimension
• Dimensions are valid only where they are specified
Introduction to Dimensions
•Types of dimensioning
• Millimeter dimensioning
• Zero precedes when the dimension is less than 1 mm.
• In case of whole number neither the decimal point nor the 0 is shown
• Last digit of fractional dimension is not followed by a zero
Introduction to Dimensions
•Types of dimensioning
• Millimeter dimensioning
Introduction to Dimensions
•Types of dimensioning
• Inch dimensioning
• Zero does not precede when the dimension is less than 1 in.
• A dimension is expressed in the same number of zeroes as the tolerances
Introduction to Dimensions
•Types of dimensioning
• Inch dimensioning
Introduction to Dimensions
• Basics of Dimensions
• Dimension Lines
• Alignment
• Spacing
Introduction to Dimensions
• Basics of Dimensions
• Extension Lines
• Crossing of extension lines
Introduction to Dimensions
• Basics of Dimensions
• Chain Lines
• Leader Lines
Introduction to Dimensions
• Basics of Dimensions
• Reference Dimensions
Introduction to Dimensions
• Dimensioning various features
• Radii
Introduction to Dimensions
• Dimensioning various features
• Foreshortened Radii
Introduction to Dimensions
• Dimensioning various features
• Irregular Outlines
Introduction to Dimensions
• Dimensioning various features
• Counter bore Holes
Introduction to Dimensions
• Dimensioning various features
• Counter sunk Holes
Introduction to Dimensions
• Dimensioning various features
• Spotfaced Holes
Introduction to Dimensions
• Dimensioning various features
• Chamfers
Introduction to Dimensions
• Dimensioning various features
• Location
Introduction to Dimensions
• Dimensioning various features
• Location
Introduction to Dimensions
• Dimensioning various features
• Repetitive features
Introduction to Dimensions
• Dimensioning various features
• Repetitive features
Introduction to Dimensions
• Dimensioning various features
• Repetitive features
Introduction to Tolerances
• Application of Tolerances
• As direct limits
• As a geometric tolerance
• In a note or table referring to specific dimensions
• In a general tolerance block referring to all dimensions on a drawing for which tolerances are not otherwise specified
Introduction to Tolerances
•Direct Tolerancing Methods
• Limit Dimensioning
Introduction to Tolerances
•Direct Tolerancing Methods
• Plus and Minus Tolerancing
Introduction to Tolerances
•Tolerance Expression
• Millimeter Tolerance
• Inch Tolerance
Introduction to Tolerances
•Tolerance Accumulation
• Chain Dimensioning
Introduction to Tolerances
•Tolerance Accumulation
• Base Line Dimensioning
Introduction to Tolerances
•Tolerance Accumulation
• Direct Dimensioning
Introduction to Tolerances
•Tolerance Accumulation
• Dimensional Limits related to an origin
Introduction to Tolerances
•Tolerance Accumulation
• Dimensional Limits related to an origin
Introduction to Tolerances
•Tolerancing on different features
• Screw Threads
• Gears and Splines
Introduction to Tolerances
•Tolerancing on different features
• Angular Surfaces
Introduction to Tolerances
•Tolerancing on different features
• Conical Tapers
Introduction to Tolerances
•Tolerancing on different features
• Radii
Introduction to Tolerances
•Tolerancing on different features
• Radii
Introduction to Tolerances
•Tolerancing on different features
• Statistical Tolerancing
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