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Geometric dimensioning and tolerancing (GDT) was developed over the last 50 years as a tool to define parts and features more efficiently. GDT takes the function of the part into consideration, as well as its fit with related parts. This allows the designer to define the part’s features more accurately, without increasing the tolerances. GDT is a very important concept related to the design of parts. Simply dimensioning a part using numerical values limits the control you have over the design of a part. For example, if you need to drill a hole of a certain diameter through a part and only specify a numerical diameter, you are only controlling the diameter of the hole. What about the circularity of the hole and the radial variation along the center line of the hole? With GDT you can specify that the hole will have a certain tolerance as to its circularity. In this chapter, you will learn how to design parts using GDT principles and apply the symbology on engineering drawings needed to communicate those principles. You will learn how to select datums, apply geometric controls, and apply a five-step process when designing parts using GDT.
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 Chapter Outline
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