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On simple parts the dimension
origin symbol may be used very effectively. This bracket
mounts on the shorter surface as shown. A lamp is attached to
the longer surface. It is desirable to inspect the 38mm
dimension by mounting the part on the functional shorter
surface. By using the dimension origin symbol, it is required
that this dimension be inspected by mounting the bracket on
the shorter surface. The same control could be accomplished by
calling out the shorter surface as a datum feature and
applying a profile of a surface control on the longer
surface.
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