Dimensioning, ContinuedRadiiA radius is the distance between an arc and its center point. Indicate thisdistance with a radius dimension line. A radius dimension line uses onearrowhead at the arc end. Never use an arrowhead at the radius center.Where location of the center is important and space permits, draw adimension line from the radius center with the arrowhead touching the arc.Place the dimension between the arrowhead and the center. In limited space,extend the dimension line through the radius center. If you cannot place thearrowhead between the radius center and the arc, place it outside the arc witha leader. Where the center of a radius is not dimensionally located, do notindicate the center.Where a dimension is given to the center of a radius, draw a small cross atthe center. Where location of the center is unimportant, the drawing mustclearly show that other dimensional features (such as tangent surfaces)control the arc location.Figure 3-27 illustrates correctly dimensioned radii.Figure 3-27.—Dimensioning radii.Continued on next page3-31
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