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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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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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Geometric reference symbols

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Definition of cylindrical OD datum

RFS: regardless ofFeature Size

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Definition of cylindrical ID datum

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Concentricity

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Surface flatness

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Surface parallelismGeneral

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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Use of feature control frames

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Basic dimensions

M i f b i l

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Meaning of basic tolerancesGeometric 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