This is one of our new entries in our GD&T Video Question Line – where we take our student questions from our Engineering Drawing Basics, GD&T Fundamentals, or GD&T Advanced Course ( and give a detailed response.

This question aims to answer how Runout is used to control the form/shape/circularity/cylindricity on a cylinder. It also talks about when there is an exception to this due to Rule #1 of GD&T.