ORDER OF INKING

Engineering Aid 3 - Beginning Structural engineering guide book
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45.161 Figure 3-40.-Order of penciling a drawing. 3. Draw the horizontal and vertical outlines, visible lines, and hidden lines. 4. Draw the nonhorizontal and nonvertical outlines, visible lines, and hidden lines. 5. Clean up the drawing, erasing all excess lines and construction lines. A construction line is a light line used as a drawing guide only. 6. Draw extension lines, dimension lines, section lines, and any other lines required. 7. Inscribe the dimensions and lettering. To a limited extent you can vary the thickness of a pencil line by varying the extent to which you bear down on the pencil. However, you can’t bear down very hard without troughing the paper. Therefore, you can’t get much variety in line weight with a pencil. For a drawing that will be inked over, this doesn’t make any difference. However, for one that will not be reproduced, or which will be reproduced directly from the pen- cil original, you must follow, as nearly as you can, the line conventions. ORDER OF INKING The beginner is usually frightened at the prospect of trying to ink a drawing without spoiling it. Once you have learned how to use drawing instruments and to follow a definite order of inking, you will have greatly reduced the danger of spoiling a drawing. Nowadays, draftsmen prefer the reservoir pen or rapidograph to the ruling pen for inking straight and curved lines and even for lettering. On the other hand, the ruling pen should NEVER be used to ink freehand lines. One good way to avoid smeared ink lines is by using SPACE BLOCKS. These strips of tape or thin pieces of plastic, when fastened to both faces of the triangles, french curves, or templates (fig. 3-41), raise their edges from the surface of the drafting paper and prevent ink from running under the edge. When you use a rapidograph or reservoir pen with a T square or parallel straightedge, make long lines with a whole arm movement and short lines with a finger movement. Draw horizontal lines from left to right, starting at the top of the drawing and working down. (If you are left-handed, you will, of course, draw these lines from right to left, and similarly reverse many of the directions given in this training manual.) Figure 3-41.-Use of space blocks. 3-27

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