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Messing With "Old School" Tolerancing
Last month's
Tip asked the question: Do all toleranced dimensions
relate to the datums stated on the drawing? And the answer was
a resounding NO. Datums only apply when referenced. This month
the drawing has been modified to solve the problem. The note
UNTOLERANCED DIMENSIONS ARE BASIC is now possible because the
"old school" linear and angular tolerances have been replaced
by a general profile of a surface tolerance in the general
titleblock. Now, instead of trying to find the center of the
30mm radius, the surface may be inspected to the required
profile.
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