Brandon walks through examples of surface straightness and derived median line straightness, explaining correct application and inspection considerations.
In this question line video, we explain when to use the diameter symbol in a feature control frame. The examples below illustrate the unique tolerance zones shapes and sizes for position, perpendicularity, straightness, runout, and cylindricity controls.
"Why doesn’t Rule #1 apply to the straightness of a Derived Median Line?" In this article, we look at both surface straightness and straightness of a feature of size to understand why Derived Median Line Straightness overrules Rule #1 of GD&T.
Controls how straight a line element or axis must be. Can apply to a surface line or to an axis — and the difference matters more than most people realize.