Partial views - 14276

Illustrator Draftsman 3 & 2 - Volume 2 Standard Practices and Theory
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Parallel Practices, Continued Partial views Sectional views Revolved or removed sections Angles Dimensioning Lettering Use a partial view if necessary to clarify the description of an object. Use a break line or the contour of the object itself to define the limitations of the partial view. Do not place break lines too near a visible or hidden line. For symmetrical objects, consider using a sectional view. You may use any type of sectional view in a multiview projection so long as its purpose is to clarify the features of an object. A cutting-plane line indicates the part being viewed with the arrowhead showing the direction of sight. You should use removed or revolved views on multiview projections to clarify an objects profile. Removed sections may be partially removed and rotated toward the plane of projection or they may be a separate revolution of the entire object aligned with the primary view as in an aligned section. Removed views are indicated by a viewing-plane line with arrowheads indicating the direction of sight. The viewing-plane shows a portion of the object as it would appear if removed from the object. In multiview projections, angles on the surface of an object that is parallel to the plane of projection appear in true size and shape. Angles on surfaces not parallel to the plane of projection appear foreshortened. Convert angle into linear measurements before drawing. All dimension lines, extension lines, and arrowheads must lie in the planes of the object to which they apply. Place dimensions outside the object outline except when it helps to clarify. Align dimensions and notes shown with leaders to the bottom of the drawing. Notes without leaders should also be aligned with the bottom of the drawing. You may use either aligned or unidirectional methods of dimensioning. Use either whole numbers and fractions, decimal, or metric units of measure to mark dimensions on a drawing. Lettering on multiview projections is single-stroke gothic. Lettering is vertical in orientation. 6-40

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