Center lines, or lines of symmetry, are used to show
A) reference locations for the machinist who will be making the part.
B) the visible edges of planes or the intersection of two planes.
C) reference locations for assembly.
D) where the center of holes or the center of cylinders are.

Question

Quizplus · Accepted Answer

Center lines are used to show the center of holes or cylinders, which is important information for machining and assembly. While center lines can also be used as reference locations, the most common and important application is indicating the center of a feature. Therefore, option D is the best choice.

Center Lines, or Lines of Symmetry, Are Used to Show