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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. |
