Draw perfect centerlines in 5 seconds or less with this command add-on for AutoCAD 2000-2007. One button, one command. No need to change layer, line color, line type, or line scale no matter how large or small your centerline. And, no need to offset, extend, or delete other lines.
Simply click the centerline button, pick two points to draw through, pick or type a protrusion distance and CenterLine Command for AutoCAD does the rest. Changes from your current layer, linetype, and linetype scale to the center layer, center linetype, and appropriate linetype scale then back again.