![]() ![]() So as Parker realized that, he started working on the new concept which was adopted as a military engineering standard in the 50s. However, we would actually want the tolerance zone to be a circle, as this allows for a uniform measurement in all angles, whereas a rectangle is longer towards the corners and shorter towards the sides. Giving a positional tolerance on that scale means that the circular hole’s position can deviate in a rectangular pattern from the intended spot. Stanley Parker is credited for being the engineer behind the development of the GD&T system in 1938.īefore that, all features used only X-Y axes to determine the position of a hole, for example. Defines production and inspection processes.Tolerances give a limit to the worst-case conditions.The universal language works regardless of who you are working with.It ensures that mating parts fit together well.The reasons for using Geometric Dimensioning and Tolerancing (GD&T) are: It is a system of symbols and standards used by engineers to provide manufacturing information to the production team.
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