ISO manufacturing tolerancing: three-dimensional transfer with analysis line method

Abstract

Functional tolerancing described in definition drawing of mechanical parts constitutes a contract to be respected by manufacturers. Process engineers have to choose process plans able to manufacture part respecting functional requirements and have to determine manufacturing specifications for each phase. Tolerance zone transfer method offers a three-dimensional algorithm of manufacturing specifications generation with International Organization for Standardization (ISO) standards. Analysis line method, developed in this article, establishes the calculus relation of the results of the tolerance chains according to the tolerances of manufacturing specifications to allow the tolerance synthesis. In this paper, the analysis line method is presented using an example. The aim is to show the hypotheses made during transfers in the context of ISO standards of tolerancing and to define accurately the datum reference frames used and deviations between these frames at particular points named analysis points.