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Technical Drawings
• Models – Used for design and analysis – SolidWorks, I-DEAS, Pro-E, …
• Component Drawings – Used to specify fabrication or procurement of parts – AutoCad, Pro-E, Solid Works …
• Assembly Drawings – Used to specify assembly of parts – AutoCad, Pro-E, SolidWorks …
• This lecture covers component drawings and tolerances
• References
• Earle, J. H., Engineering Design Graphics (Addison-Wesley, 1983)
• ASME Y14.5M Dimensioning and tolerancing
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Component Drawings
• Orthographic projection
• Isometric layout
• Dimensioning
• Tolerancing
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3-view orthographic projection
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Views and projections
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Inclined planes
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Hidden lines
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Holes and cylinders
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Concentric cylinders
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Auxiliary views
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Auxiliary views
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Section views
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Half section views
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Pictorial (3D)drawings
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Isometric layout
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Isometric drawings (2)
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Cylinders in isometric
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Linear dimensions
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Angular dimensions
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Grouping of dimensions
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Application of dimensions
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Staggered dimensions
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Leaders
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Diameters, radii
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Tabular dimensions
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Tolerances
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Default tolerances
Can be specified in Title Block of drawing
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Specification of datum
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Datum reference frame
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Reference to datum
MMC = Maximum Material Condition
LMC = Least Material Condition
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Modifying symbols
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Geometric characteristic symbols
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Definition of cylindrical OD datum
RFS: regardless of Feature Size
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Definition of cylindrical ID datum
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Concentricity
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Circularity, Cylindricity
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Surface flatness
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Surface parallelism General
Using tangent plane
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Perpendicularity
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Parallelism for axis
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Runout
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Surface orientation
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Profile tolerance
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Use of feature control frames
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Basic dimensions
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Meaning of basic tolerances Geometric Dimensioning and Tolerancing
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Tolerancing using basic dimensions
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Example of multiple features
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Tolerance zones