![]() ![]() DIMENSION LINE – Thin and dark lines use to show the size (span) of an object with a numeric value. CONSTRUCTION LINE – Very light and thin line use to construct layout work.ģ. OBJECT OR VISIBLE LINES – Thick dark line use to show outline of object, visible edges and surfaces.Ģ. The key to successful drafting is to have a good technical knowledge of these various line characteristics – to understand where and when to apply them in technical drawing. Lines that are less important are thin and light. Every line is drawn at different thicknesses and darkness to express contrast as well as importance. Line significance is conveyed by line weight or thickness of the line. Line features vary not only by width but also by how they are graphically represented in a drawing. The use of line symbols enables engineers/designers to express the features of designed products clearly and accurately. Line symbols used in technical drawing are often referred to as ALPHABET OF LINES. ![]() To work in the design and manufacturing industries, the study of technical drawing ability to prepare, read and interpret technical drawing is essential. Contractors, estimators, tradesmen, and builders rely totally on technical drawings for the information they need to build, construct and manufacture a product.
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