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Technical Paper

The Accuracy of CAD/CAM Parts - A Critical Analysis

2012-04-16
2012-01-0557
In October, 1987, this author wrote a paper entitled The Metrology Crisis, wherein he revealed that our nation's industries did not know how to control the shape of their manufactured hardware. This stemmed from the non-use or misunderstanding of the ASME Y14.5 standard on dimensioning and tolerancing. Shortly afterward, major algorithm errors were discovered in our nation's coordinate measurement machines. The measurements of million dollar measuring systems were not accurate. They did not conform to the definitions established in the Y14.5 standard. The revelations of The Metrology Crisis and the discovery of algorithm errors sent shockwaves throughout the government, industry, and standards agencies. It would take seven years to create the highly complex mathematical formulas, compiled in a new standard, ASME Y14.5.1M-1994. One year later, a certification program, proposed by this author, was created under the guidelines of another a new standard, ASME Y14.5.2-1995.
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