Introductory Engineering Graphics by Edward E. Osakue

Author:Edward E. Osakue
Language: eng
Format: epub
Publisher: Momentum Press

4.6.14 UN-SECTIONED FEATURES

Some features are not hatched in section views if the cutting plane is parallel to their axes. Such features are normally thin and include ribs, webs, lugs, and spokes. However, if the cutting plane is perpendicular to their axes, they may be hatched. Figure 4.18 shows the cutting planes are parallel to a lug and spokes. In a section view, these features are un-hatched because of this parallel geometric relationship. In Figure 4.19, the cutting planes are parallel to a rib and web in the A-A section views, and the rib and wed are un-hatched or un-sectioned. The cutting planes for the B-B sections are defined perpendicular to the rib and web. In this case, the rib and web are hatched or sectioned because of the perpendicular geometric relationship. Figure 4.20 shows a shaft, key, bolt, and nut in section. By convention, these components are not hatched as indicated. Some other standard parts or components not hatched in section views include pins, dowels, fasteners, gears, bearings, and springs.

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