Tolerance Analysis of Machining Fixture Locators

[+] Author and Article Information
S. A. Choudhuri

Department of Industrial and Manufacturing Engineering, The Pennsylvania State University, University Park, PA 16802

E. C. De Meter

Department of Industrial and Manufacturing Engineering, Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA 16802

J. Manuf. Sci. Eng 121(2), 273-281 (May 01, 1999) (9 pages) doi:10.1115/1.2831216 History: Received December 01, 1996; Revised March 01, 1998; Online January 17, 2008


The geometric variability of locators within a machining fixture is a known source of datum establishment error and machined feature geometric error. A locator tolerance is used to specify the range of permissible locator variation. Currently there are no models that relate a locator tolerance scheme to the worst case geometric errors that may result due to datum establishment error. This paper presents a methodology for modeling and analyzing the impact of a locator tolerance scheme on the potential datum related, geometric errors of linear, machined features. This paper also provides a simulation study in which locator tolerance analysis is applied to reveal some important insights into the relationship between machined feature geometric error, locator design, and locator tolerance scheme.

Copyright © 1999 by The American Society of Mechanical Engineers
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