Dimensioning, ContinuedChamfersChamfers are bevels. External chamfers are bevels at the end of a dowel orshaft. Internal chamfers are bevels placed on the edges of a hole in anobject. Dimension chamfers by angle and a linear dimension or by twolinear dimensions. When specifying an angle and linear dimension, the lineardimension is the distance from the indicated surface of the part to the start ofthe chamfer.Use a note to specify 45° chamfers. Use this method only with 45° chamfersas the linear value applies in either the longitudinal (internal) or radial(external) direction.When depicting a chamfer of a round hole, follow the practice ofdimensioning as shown (figure 3-35, view C) except where the chamferdiameter requires dimensional control. Also, apply this type of control to thechamfer diameter on a shaft.Figure 3-35 illustrates dimensioning chamfers, 45° chamfers, and internalchamfers.Figure 3-35.—Dimensioning chamfers.3-39
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