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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