Tolerancing is one of the most important tools for planning, controlling, and improving quality in the industry. Tolerancing conducted by design engineers to meet customers’ needs is a prerequisite for producing high-quality products. Engineers use handbooks to conduct tolerancing. While use of statistical methods for tolerancing is not a new concept, engineers often use known distributions, in...

The define–measure–analyze–improve–control (DMAIC) approach is a five-strata approach, namely DMAIC. This approach is the scientific approach for reducing the deviations and improving the capability levels of the manufacturing processes. The present work elaborates on DMAIC approach applied in reducing the process variations of the stub-end-hole boring operation of the manufacture of cra...

This paper describes the development of a prototype software package for solving functional dimensioning and tolerancing (FD&T) problems in a Concurrent Engineering environment. It provides a systematic way of converting functional requirements of a product into dimensional specifications by means of the following steps: firstly, the relationships necessary for solving FD&T problems are represe...

Purpose – The purpose of this paper is to present a state-of-the-art review of dimensional tolerance synthesis and to demonstrate the evolution of tolerance synthesis from product to process-oriented strategy, as well as to compare the same for single stage and multistage manufacturing systems (MMS). The main focus is in delineating the different approaches, methods and techniques used with cri...

The tolerancing process impacts the product quality, production cost and scrap rate. Tight tolerances allow to assure performance; loose reduce cost. tolerance allocation of a complex system is performed under uncertainty. In fact, accuracy behaviour simulation significantly affects analysis result, thus result. Therefore, method proposed perform based on Dempster Shafer theory, Monte-Carlo gen...

Introduction Tolerancing an optical system has traditionally fallen between an art and a science. Experience and intuition has driven optical engineers for decades in deciding the appropriate tolerances to place on optical components and the mechanics holding them. In an effort to systematically quantify this process, mathematical methods have been reported by Warren Smith, Ronald Willey, and o...

Product and manufacturing system design are the core issues in product development and dominate the profitability of a company. In order to assess and optimize the product and manufacturing system design, an objective evaluation framework is needed. Despite the many existing tools for product and manufacturing system design, there is a missing link between the product design and the production ...

The classiication problem is fundamental in the metrology of Geometric Tolerancing: given a part B, is it within some tolerance ? The \standard method-ology" for the classiication problem comprises three steps: sampling , algorithmic step and policy decision . The issues we examine are posed around this methodology, using a simple 1-dimensional problem as case study.