![]() ![]() ![]() The position of the feature would be defined in relation to the intended position, if accurate tolerancing specifications were used.Ī feature could still be within a circular tolerance, but not within the X-Y square.ĭuring World War II, naval weapons engineer Stanley Parker discovered this issue while attempting to measure torpedoes.īetween 19, Parker created a new system that removed the issue of false negatives, creating GD&T to be a more cost- and time-efficient system. However, using X-Y areas could lead to the production of a false negative on inspection. ![]() Prior to the use of GD&T, an X-Y area was used to specify manufacturing features. What is GD&T? Origin and Why Do MEs Use It? ![]()
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May 2023
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