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© R. Jerz 2 Feb-06
Working DrawingsWorking Drawings
Detailed part or assembly drawingComplete information for constructionShape, Dimensions, Specifications
© R. Jerz 4 Feb-06
DimensioningDimensioning
Placement• Unidirectional (preferred) • Aligned
Dimension LinesExtension LinesASME Y14.5
© R. Jerz 9 Feb-06
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
© R. Jerz 10 Feb-06
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
© R. Jerz 11 Feb-06
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