- [Instructor] Profiles are outlines of part features.
Those features can be surfaces,
or shapes consisting of a single geometry,
or the intersection of multiple geometric elements.
Profile tolerances control how much those outlines
can deviate in size, shape, orientation, or location,
from the perfect geometry.
A line-profile control
defines how much a single line or curve
is allowed to deviate from the desired form.
This control is used on two-dimensional curves,
and applied to the cross-section of a part.
For example, the cross-sectional tolerance
of an airplane wing, or an aluminum extrusion,
can be controlled with the line-profile control.
The surface-profile control can be applied
to any three-dimensional surface of a given shape.
It constrains how far the points on that surface can deviate
from the actual true surface, as defined in the CAD program.