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Your Datum Reference Frame and Satisfy Others
Often people are troubled when the
planes of a datum reference frame do not appear as vertical or
horizontal centerlines on the drawing. On this drawing the
second and third datum planes of the datum reference frame
established by A, B, C are not vertical and horizontal. The
dimensioning and tolerancing is easier to read/understand if
two additional mutually perpendicular planes are added to the
drawing. The intersection of these planes is a line coincident
with datum axis B. They are oriented 52 degrees BASIC from the
actual datum planes of the datum reference frame. As long as
all of the features on the part are tied together by basic
dimensions, this approach to dimensioning may be
used.
Note: For clarity, this drawing
is intentionally incomplete.
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