tailieunhanh - Geometric Dimensioning and Tolerancing for Mechanical Design Part 12

Tham khảo tài liệu 'geometric dimensioning and tolerancing for mechanical design part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Source Geometric Dimensioning and Tolerancing for Mechanical Design Chapter 13 Graphic Analysis Graphic analysis sometimes referred to as paper gaging is a technique that effectively translates coordinate measurements into positional tolerance geometry that can easily be analyzed. It provides the benefit of functional gaging without the time and expense required to design and manufacture a closetolerance hardened-metal functional gage. Chapter Objectives After completing this chapter you will be able to Identify the advantages of graphic analysis Explain the accuracy of graphic analysis Perform inspection analysis of a composite geometric tolerance Perform inspection analysis of a pattern of features controlled to a datum feature of size Advantages of Graphic Analysis The graphic analysis approach to gaging has many advantages compared to gaging with traditional functional gages. A partial list of advantages would include the following Provides functional acceptance Most hardware is designed to provide interchangeability of parts. As machined features depart from their maximum material condition MMC size location tolerance of the features can be increased while maintaining functional interchangeability. The graphic analysis technique provides an evaluation of these added functional tolerances in the acceptance process. It also shows how an unacceptable part can be reworked. 207 Downloaded from Digital Engineering Library @ McGraw-Hill Copyright 2006 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Graphic Analysis 208 Chapter Thirteen Reduces cost and time The high cost and long lead time required for the design and manufacture of a functional gage can be eliminated in favor of graphic analysis. Inspectors can conduct an immediate inexpensive functional inspection at their workstations. Eliminates gage tolerance and wear allowance Functional gage design allows 10 .