Seating Plane Feature

The Seating Plane feature is based on the Jedec Coplanarity Test for Surface-Mount, semiconductor devices. This seating plane applies to "feet" on chips, ball grid arrays, lead frame contacts, and other related applications. The purpose of the seating plane is to find which points a chip will
contact when a chip is set on them.

InSpec's Seating Plane finds the highest three points relative to the other points beginning with a Z+ orientation. Typically the seating plane is constructed from several points.
The triangle created by the three points must contain the center of gravity with respect to all of the points.

The coplanarity calculated by the seating plane feature is the perpendicular distance from the plane (top three features) to the farthest (lowest) point.
The three points that create the top plane and the farthest point are highlighted in the points window.

To use the Seating Plane feature in InSpec, select the Feature menu - Insert - Seating Plane.