Design Approach of Distributing Geometric Tolerances of Mechanical Parts

Abstract

The geometric feature variations of the individual mechanical part cause large variations of the other parts that are connected with the part in the assembly processes. Therefore the planning and designing the geometric feature variations should be discussed from the viewpoints of both the analysis and the synthesis of the geometric tolerance. The objective of the present research is to develop a systematic method for planning and designing the distribution of the geometric tolerances of the three-dimensional shapes of the mechanical parts. In order to satisfy the specified accuracy of the mechanical products, the proposed method determines the individual tolerance range of the geometric features by using nonlinear programming. A case study on a stack of two parallelisms is carried out to estimate the proposed method.