Mechanical Tolerance Stackup and Analysis
Bryan R. Fischer | 2004-06-22 00:00:00 | CRC Press | 408 | Engineering
This text is the definitive work on mechanical tolerancing, tolerance stackups, and tolerance analysis.
Written by one of the foremost authorities in the field, this reference presents proven and easy-to-use methods for determining whether selected dimensioning and tolerancing schemes will yield functional parts and assemblies and the most practical procedure to communicate the results. The text develops effective problem-solving and analytical skills using a variety of examples and real-world design challenges that stress the importance of a standardized approach to tolerance stackups.
This text presents the background material and step-by-step techniques required to solve various tolerance analysis problems. Worst-case and statistical methods are presented. Using these techniques, the design engineer can determine if the form and fit of related parts and assemblies will satisfy their intended function.
Manufacturing, inspection, assembly and service personnel can use these techniques to troubleshoot problems on existing designs, to verify their in-process steps will meet the desired objective, or even to find ways to improve performance and reduce costs.
There are two methods used to specify dimensions and tolerances: traditional plus and minus dimensioning and tolerancing and geometric dimension and tolerancing, or GD&T. This text includes coverage of both techniques. GD&T and its principles are discussed in-depth, as the point of Tolerance Analysis is ultimately to prove a dimensioning and tolerancing scheme will work, and the only way to precisely specify the required geometric conditions is through the use of GD&T. Although plus and minus dimensioning and tolerancing is still commonly used, and this text discusses how to perform Tolerance Stackups on parts and assemblies based on plus and minus dimensioning and tolerancing, part of the goal of this text is to help the reader understand why GD&T is a much better system.
The importance of a standardized approach to solving tolerance analysis problems cannot be overstated. Equally important is the need to communicate the results of a tolerance stackup. Rarely is a tolerance stackup done without the need to share the results or to convince someone else to make a change. Techniques must be used that help ensure that the problem will be solved correctly and that the results will be understood by all parties involved. The techniques outlined in this text address these needs in detail.
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