Drawing AidsIntroductionLettering aids, triangles, protractors, anything that helps the draftsman createan image, is a drawing aid. Some shops are fortunate enough to give eachworker a set of drawing aids. Other shops have to share equipment amongthe workers. If your shop shares equipment among the workers, put the gearaway clean and in good repair. Keep uncommon tools in commonlyaccessible places.General careMost drawing aids are made of plastic. Hang up drawing aids or store themflat when they are not in use. Never cut against the edges of a drawing aidor use them as a scraper. When a drawing aid is warped, nicked, out of true,or broken, throw it away and get another.TrianglesUse triangles to draw lines at various inclines to the horizontal. Twocommon triangles are the 30/60- degree and the 45-degree triangle. Both ofthese triangles have a 90-degree base angle. A combination of a 30/60- and a45-degree triangle creates eleven other angles. Triangles may or may nothave an ink riser to prevent the flow of ink under the triangle edge. Plastictriangles are the easiest to use because you can see the work through them.Figure 2-43 illustrates the angles created when you use combinations of a30/60- and a 45-degree triangles.Figure 2-43. —Common angle combinations.Continued on next page2-37
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