Exam 10: Reading Sections, Revolutions, and Conventional Breaks

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The direction of sight of a cutting plane line shows what part of the feature is viewed when the rest of it is taken away.

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Describe the practice of conventional revolution and explain why true projection is a poor practice when this application is used.

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When the true projection of a feature results in foreshortening, the feature should be revolved onto a plane perpendicular to the line of sight as in Figure 13.22. The revolved spoke shown gives a clear representation. The true projection is poor practice because the spoke is foreshortened.

Staggered interior features of an object are sectioned by the cutting plane line to align through the feature.

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A cutting plane line is shown completely through the object, passing through offset features of the object. The section on the drawing is a(n) ____.

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True projection is always important between views on a print.

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Section lines are shown on all parts of a section, especially thin parts.

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A full section is drawn when the cutting plane extends completely through the object, usually along a center plane.

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A gasket is commonly sectioned even though it is a thin part.

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When using the option of a revolved section, ____.

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A sectional view established by revolving 90 degrees, in place, into a plane perpendicular to the line of sight, generally used to show the cross section of a part or feature that has consistent shape throughout the length.

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A conventional revolution is used when the true projection of a feature results in foreshortening.

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What are coded section lines used for?

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Used typically for symmetrical objects; the cutting-plane line actually cuts through one quarter of the part. The sectional view shows half of the interior and half of the exterior at the same time.

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The sectional view is created by placing an imaginary _________________________ through the object cutting away the area to be exposed.

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If there are enough sectional views on a drawing to use up all of the letters of the alphabet, then _______ letters are used to label the cutting plane lines and related views, such as ___________.

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Dimensioning to hidden features is a poor practice on a print.

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The cutting-plane line is a thick line representing the cutting plane. The cutting plane line can be shown using alternating long and two short dashes, or evenly spaced dashes.

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The change in direction of the cutting plane line is less than 90° in an aligned section.

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A removed section represents a portion of a part pivoted 90° and removed to show the section at that location.

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A revolved section is used when a feature that has a constant shape throughout the length is rotated so that the adjacent view shows the feature's constant shape.

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