11 Technical Drawings

Technical Drawings •

Models – –

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Component Drawings – –

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Used for design and analysis SolidWorks, I-DEAS, Pro-E, … 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 …

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This lecture covers component drawings and tolerances

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References

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Earle, J. H., Engineering Design Graphics (Addison-Wesley, 1983)

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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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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 J. H. Burge University of Arizona

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Geometric reference 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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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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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

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