© R. Jerz 1 Feb-06

Working DrawingsWorking Drawings

© R. Jerz 2 Feb-06

Working DrawingsWorking Drawings

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

© R. Jerz 3 Feb-06

Dimensioning ExampleDimensioning Example

© R. Jerz 4 Feb-06

DimensioningDimensioning

Placement• Unidirectional (preferred) • Aligned

Dimension LinesExtension LinesASME Y14.5

© R. Jerz 5 Feb-06

Unidirectional and AlignedUnidirectional and Aligned

© R. Jerz 6 Feb-06

© R. Jerz 7 Feb-06

Extension LinesExtension Lines

© R. Jerz 8 Feb-06

Extension LinesExtension Lines

© 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

© R. Jerz 12 Feb-06

Example of RulesExample of Rules

© R. Jerz 13 Feb-06

Example of RulesExample of Rules

© R. Jerz 14 Feb-06

AssignmentAssignment

A4