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There is an easier way to
tolerance Unequal and Unilateral Profile.
The ASME Y14.41-2003 Digital Product Definition Data
Practices standard has given us a new way to express several
geometric tolerances. One of the most useful is the one for
unequal bilateral and unilateral profile of a surface
tolerances. In the interest of space, both methods of
indicating unequal bilateral profile of a surface
tolerancing on a drawing are illustrated. Both would not
appear on a single drawing. Think of the detail view as the
MEANS THIS portion. According to the Y14.41 standard, the
value that follows the U in a circle is the amount of
tolerance zone that applies outward from the surface. This
may also be used to indicate a unilateral profile tolerance.
Of course, if you want to use this new symbol, you should
reference ASME Y14.41-2003 as well as ASME Y14.5-1994 so
everyone reading the drawing knows where to find the
meaning.
Of course, if it is designed in mm and you build in mm, this is not an issue. But, if you insist on converting metric values to inches, do it right.
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