Straightness
There are two kinds of straightness
tolerance - (1) Straightness of an axis or center plane and
(2) surface straightness. The type of straightness is
determined by the placement of the feature control
frame.
When the feature control frame is next to
the size dimension, it is controlling the axis or center
plane. An inspector must derive the median plane or median
axis. This can be extremely time consuming and expensive to
measure.
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When the feature
control frame is on a leader line pointing to a surface,
the straightness is applied to line elements in the
surface. |
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