Exam 3: Coordinate Tolerancing and Geometric Dimensioning and Tolerancing GDT

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GD&T provides four important benefits to an organization:
1. Improves Communication: GD&T can provide uniformity in drawing specifications and interpretation, thereby reducing controversy, guesswork and assumptions. Design, production, and inspection all work in the same language.
2. Provides Better Product Design: The use of GD&T can improve your product designs by providing designers with the tools to "say what they mean," and by following the functional dimensioning philosophy.
3. Increases Tolerances for Production: There are two ways tolerances are increased through the use of GD&T. First, under certain conditions, GD&T provides "bonus"-or extra-tolerance for manufacturing. This additional tolerance can make a significant savings in production costs. Second, by the use of functional dimensioning, the tolerances are assigned to the part based upon its functional requirements. This often results in a larger tolerance for manufacturing. It eliminates the problems that result when designers copy existing tolerances, or assign tight tolerances, because they don't know how to determine a reasonable (functional) tolerance.
4. Lowers Costs: The result common to each of the first three benefits is lower costs for manufacturing and inspection of the part.