Oblique Projections, ContinuedObliquedimensioningAll dimension lines, extension lines, and arrowheads must lie in the planes ofthe object to which they apply. Place dimensions outside the object outlineexcept when it helps to clarify. Align dimensions and notes shown withleaders to the bottom of the drawing. Notes without leaders should also bealigned with the bottom of the drawing. There are two systems to indicatedimensions on drawings; the aligned dimension and the unidirectionaldimension systems. Select one system of dimensioning to use throughout thedrawing. You may show dimensions with either whole numbers andfractions, decimals, or metric units of measure.ALIGNED DIMENSIONS:Drawings made with aligned dimensions haveall figures and notes aligned with a dimension line so that all read from thesides or edges of the drawing. Aligned dimensions are sometimes referred toas pictorial dimensions.UNIDIRECTIONAL DIMENSIONS: In the unidirectional dimension system,all dimension figures and notes are lettered horizontally and are read from thebottom of the drawing. The unidirectional dimension system is preferredover the aligned system because it is easier to read and understand.Figure 6-11 are examples of both the aligned and unidirectional dimensioningsystems.Figure 6-11.—Dimensioning.6-14
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