Rocker Cover Gauging

This is an application to determine whether a gasket is located properly in a rocker arm cover. 3 LVDTs were used to measure the outside edges of a plastic rocker arm cover establishing a plane. 4 additional LVDTs were then extended to the location of the inner gasket and compared to the location of the outer edge. What made this application interesting was the use of a Basic module in an Allen-Bradley SLC rack to perform the plane calculations and determine where the imaginary intercepts were at any point on the surface of the plane. This could be done much more easily now with the more powerful processors available in PLCs.