The edge view of the cutting plane is shown on a drawing with a cutting-plane line (see below). The cutting plane is drawn as a thick line on the view in which it appears as an edge. The sectional view is projected orthographically from this view. Often, the cutting plane line has arrows on each end, drawn at right angles to the line. The arrows indicate the direction of sight used to draw the sectional view.
Often a section is identified by a capital letter beside each arrowhead (see below). This lettering is especially important when several sections have been taken. If it is obvious where each section has been taken, the letters can be omitted. When the cutting plane line coincides with a center line, the cutting-plane line takes precedence unless the location of the section is clear without it.
Last Updated Jan. 31/00