How can you locate missing lines in drawings?

Question

What will be an ideal response?

Answer 1

A common problem with hand-created or 2D CAD-created drawings is that one or more line segments may be missing from one or more of the orthogonal views. This error is especially difficult to correct when someone else made the drawing.


The general procedure for locating a missing line is to examine the vertices in the adjacent views. Vertices are formed when surfaces or edges intersect as features on the object. A vertex in one view means there must be a corresponding vertex or edge in its adjacent views. Also, vertices representing the same point or edge on the object must be aligned horizontally or vertically in adjacent views. To discover any missing features, you can start with any view; but eventually you have to examine all of the views. From each vertex in a view, create horizontal or vertical alignment lines into the adjacent view. In the adjacent views along each alignment line, you should see the meeting of two surfaces to form an edge or the meeting of multiple surfaces to form another vertex.