ATTACHMENT OF PAPER TO THE BOARD

Engineering Aid 3 - Beginning Structural engineering guide book
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main purpose of making your first drawings is to learn to use instruments. Each drawing will offer an opportunity for practice. Later on, good form in the use of instruments will become a natural habit. Accurate pencil drawings are of first importance since all inked drawings and tracings are made from finished pencil drawings. It is a mistake to believe that a poor pencil drawing can be corrected when you make the ink tracing. Any drawing important enough to be inked or traced in ink must be accurate, legible, and neat. Because most military and commercial blueprints are made from pencil drawings, ambitious trainees will work to acquire skill in pencil drawing as they perfect their technique. Good technique and skillful pencil drawing are basic to proficiency in drafting. The following sections will guide you in attaching your drawing paper to the board and in drawing basic lines with the T square, triangles, and pencil. ATTACHMENT OF PAPER TO THE BOARD Now that you have become relatively familiar with your equipment and materials, it is time to get started by attaching your drafting paper to the board. The sheet should be placed close to the left edge of the drafting board. Working in this area makes the T square easier to handle and reduces the likelihood of error because of T square “swing.” The drafting sheet should be far enough from the bottom of the board (about 3 in.) to ensure firm support for the head of the T square when you are drawing at the lower part of the sheet. A drawing sheet properly attached to the board on which a T square is used is shown in figure 3-2. After aligning the drawing sheet, smooth out any wrinkles and fasten the four corners with short strips of drafting tape. If you are attaching large sheets, you should place additional strips of tape at the top and bottom edges of the sheet. Drafting tape has a lighter coating of adhesive than does masking tape. Consequently, it will hold the drawing firmly, yet can be removed without tearing or marring the drawing. If you use masking tape or transparent tape, leave a large margin in the event you tear the paper when removing the tape. When placed diagonally across the corners of the sheet, as shown in figure 3-2, the drafting tape offers little obstruction to movement of the T square and triangles. Avoid the use of thumbtacks; they will eventually ruin the drafting board. If you are using a parallel straightedge or draft- ing machine instead of a T square, the procedure just described is the same with one exception. Instead of placing the paper close to the left edge of the board, you should place it approximately at the midpoint of the length of the parallel straightedge or in the center of the drawing board surface when you are using a drafting machine. HORIZONTAL LINES by The draftsman’s horizontal line is constructed drawing from left to right along the working Figure 3-2.-Attaching drafting paper to the board. 29.275 Figure 3-3.-Construction of basic lines. 3-4

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