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When measuring nearly every
geometric control, the indicator or CMM probe should move
normal (at 90°) to the surface. The exception is circularity
when applied to a conical surface. Circularity requires
that the movement be in a plane normal to the axis rather than
the surface. If the movement for other geometric controls
is not normal to the surface, a sine or cosine correction
should be made. For the profile of a surface control
which is applicable to the 2X R8 corners shown on the drawing,
once the datums are established, the part may be rotated about
the basic location of the radii while the indicator remains
normal to the surface.
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