Working DrawingsWorking Drawings · Working DrawingsWorking Drawings zDetailed part or assembly drawing ... • Architectural zSI ... zDimension lines should be outside the part outline

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Working DrawingsWorking Drawings

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Working DrawingsWorking Drawings

Detailed part or assembly drawingComplete information for constructionShape, Dimensions, Specifications

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Dimensioning ExampleDimensioning Example

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DimensioningDimensioning

Placement• Unidirectional (preferred) • Aligned

Dimension LinesExtension LinesASME Y14.5

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Unidirectional and AlignedUnidirectional and Aligned

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Extension LinesExtension Lines

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Extension LinesExtension Lines

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MeasurementMeasurement

Decimal-inch (e.g., 15.03)• 2 places most often

Fractional-inch (e.g., 1 ½)• Not preferred• 64th’s

Feet and inch (e.g., 2’-7”)• Architectural

SI – Metric• Degrees of precision• 0.2 preferred (versus .20)• “Metric” should be noted on drawing

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Rules for DimensioningRules for Dimensioning

In applying rules, “clarity” prevailsDimension lines should be outside the part outlineDimension lines should not cross each otherDon’t double dimension, no redundant dimensionsPick the view that most clearly describes the featurePlace dimensions between views when possible

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Rules for DimensioningRules for Dimensioning

Dimension to solid lines instead of hidden linesPlace smallest dimension first, largest farthest from profileUse one dimension system (unidirectional)Leave a small gap between extension line and featureExtension lines do not cross unless unavoidable

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Example of RulesExample of Rules

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Example of RulesExample of Rules

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AssignmentAssignment

A4