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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.
Date of Publication: Jun 1974