Sketches are not usually drawn to scale. Sketches of larger and more complicated projects can serve as the basis for accurate working drawings. Working drawings are complete drawings done in universal graphic language so that the object depicted can be constructed from the drawing alone without additional information. Dimensions - Working drawings use lines scaled to the dimensions of the actual objects. Most working drawings show three separate sides of anobject from three flat, head-on views.
Pictorial drawings show three sides of an object together in one view.
B. Types of working drawings 1. They show a flat, head-on view of every side that differs in size and shape. Such drawings can show the true dimensions of an object's top, side, and end views. The line angles of isometric drawings are not accurate, but are nevertheless used to give the object a three dimensional effect. Like isometric drawings, oblique drawings can depict the true dimensions of an object's top, side, and end.