Transcription of Geometric Dimensioning and Tolerancing
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Geometric Dimensioning and Tolerancing
5-1 Geometric Dimensioning and TolerancingWalter M. StitesPaul DrakeWalter M. StitesAccraTronics Seals , CaliforniaWalter M. Stites is a graduate of California State University, Northridge. His 20-year tenure atAccraTronics Seals Corp began with six years in the machine shop, where he performed every task fromoperating a hand drill press to making tools and fixtures. Trained in coordinate measuring machine(CMM) programming in 1983, he has since written more than 1,000 CMM programs. He also performsproduct design, manufacturing engineering, and drafting. In 12 years of computer-assisted drafting,he s generated more than 800 engineering drawings, most employing GD&T. He has written variousmanuals, technical reports, and articles for journals. Mr. Stites is currently secretary of the ASME and a key player in the ongoing development of national drafting Geometric Dimensioning and Tolerancing (GD&T)When a hobbyist needs a simple part for a project, he might go straight to the little lathe or milling machinein his garage and produce it in a matter of minutes.
Finally, GD&T can only express what a surface shall be. It’s incapable of specifying manufacturing processes for making it so. Likewise, there is no vocabulary in GD&T for specifying inspection or gaging methods. To summarize, GD&T is the language that designers use to translate design requirements into measurable specifications.
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