Datum & Datum Reference Frame (DRF) The primary is the first feature contacted (minimum contact at 3 points), the secondary feature is the second feature contacted (minimum contact at 2 points), and the tertiary is the third feature contacted (minimum contact at 1 point). Contacting the three (3) datum features simultaneously establishes the three (3) …
Introduction to GD&T During WW II companies had to “farm out” parts because of the quantities/schedules. This meant the new manufacturer had to interpret the drawing hence the “centerlines” were often established by contacting features that were not functional or important and features produced from these incorrect “centerlines” were not at the location required. The …
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