DraftingDefinitionsIntroductionYou should understand the definitions of a few terms before continuing.DefinitionsMost drawings fall into one of six basic categories, which includeinstrumental or mechanical drawings, computer-aided drafting or computer-aided design and drafting, engineering drawings and engineering drafting,engineering graphics or engineering design graphics, technical drawings, andtechnical sketching.INSTRUMENTAL OR MECHANICAL DRAWINGS: The category ofinstrumental or mechanical drawings applies only to drawings made in wholeor in part with drawing instruments.COMPUTER-AIDED DRAFTING (CAD) and COMPUTER-AIDEDDESIGN AND DRAFTING (CADD): Using computer techniques with theaid of graphic data processing systems to graphically express or solvetechnical equations is called CAD or CADD.ENGINEERING DRAWINGS and ENGINEERING DRAFTING: Drawingsused in technical work or industrial production are referred to as engineeringdrawings. The terms working drawings and machine drawings are also usedin reference to engineering drawings.ENGINEERING GRAPHICS or ENGINEERING DESIGN GRAPHICS:Engineering graphics or engineering design graphics refers to the design andspecifications for physical objects and data relationships as in engineering andscience.TECHNICAL DRAWING: Any drawing that expresses technical ideas is atechnical drawing and may also be called working or machine drawings.TECHNICAL SKETCHING: Technical sketching is freehand drawing.Another term you should be familiar with is blueprint reading. Blueprintreading is reading and interpreting a graphic language through symbologyused to express technical ideas or mechanical solutions.Regardless ofwhether the drawing is on paper, film, computer monitor, or a table napkin,the graphic language should be the same.3-4
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