“GD&T was developed to address the many problems that had been encountered over the years as companies tried to describe their part geometry,” according to Bryan R. Fischer, president of Advanced Dimensional Management LLC.
“They realized that it was very difficult to quantify the variation allowed on the geometry of their parts and assemblies. More importantly, they found that everybody reading their drawings had a different interpretation of their specifications, and the limits they created. This led to mistakes, rejected parts, non-conforming parts, wasted time and money, and costly delays in production.