cad13992

Concentricity:

The first feature must be a sphere (3D concentricity) or a slot, cylinder, cone, or circle
(2D concentricity). The second feature is used as a datum feature and must be a
cylinder, cone, line, or circle. If there is no datum, the origin and z vector of the
current active alignment are used for the datum.
If the first feature is a slot, cylinder, cone, or circle, the perpendicular distance from
the centroid of the feature to the datum feature’s axis is calculated. The 2D concentricity is twice this value.
If the first feature is a sphere, the 3D concentricity is calculated as twice the 3D
distance of the sphere’s centroid from the datum centroid (or active alignment origin
if there is no datum).
Starting with V40, Concentricity dimensions can be specified using feature control
frames similar to the callouts on drawings. The user must first define which feature is
to be used as a datum by assigning datum letters A, B, C, etc to the datum features.

Run-out:

The runout dimension determines the runout of the first feature with respect to the
second feature (i.e., the second feature becomes the datum feature). If only one
feature is selected, the origin of the current active alignment and the workplane
vector define the datum feature. The text in the Edit window for the datum feature
will read "THE ORIGIN".
This option works for circles, cones, cylinders, spheres, and planes. This
dimension type is considered one sided, meaning a single positive value tolerance
is applied.
The runout for circles, cones, and cylinders is the difference between the max and
min radial deviation of the measure points from the datum axis. The runout for
spheres is the difference between the max and min radial deviation of the measure
points from the datum origin. The radial deviation of circles, cylinders and
spheres is based on the measured radius of the feature. The radial deviation of
cones is based on the radius at the cone height of each measure point using the
measured angle of the cone.
The runout for planes is the difference between the max and min deviation of the
measure points from the plane formed by the feature plane’s measured centroid
and the datum vector.
For cylinders, cones, spheres and planes, the reported runout is the total runout.
For circles, the reported runout is circular runout.