Registration System Study as Applied to Printed Circuit Boards

In the fabrication of printed circuit boards there are many machines and processes that independently Operate in series On the product, each operation with a tolerance determined by cost factors. The combining of these tolerances, some location tolerances such as X-Y tables, and some size tolerances such as pad exposures is accomplished by using basic probability techniques so that the process yield is found as a function of the decision variables (drill radius and pad radius). A formulation suitable for programming on a computer is developed in this paper so that the calculations can be done quickly.