Engineers may manually draw cutting plane lines on their designs by using paper, pencil or pen, a straight edge ruler, or T-Squares. Today, most cutting plane lines are done electronically, with engineers using computer aided design to create them.
Cutting plane lines are thick lines that run through the center of the object that the interior wants to provide an interior view of. Two perpendicular lines with arrows showing in which direction the interior of the object should be viewed are drawn at the end of the line.
In the field of engineering, two forms of cutting plane lines have been approved for use on plans. A series of evenly spaced dashes with arrows at the end comprises the first approved form. In the second form, pairs of long dashes are alternated with short dashes to form a cutting plane line.
On engineering plans that feature a lot of lines, cutting plane lines can be changed by removing the dashes at either end.