Commonly used drawing tools include

Commonly used drawing tools: first, the minute gauge is used to measure the size, intercept line segments, equidistant segments of the tool. The end of the two legs of the sub-gauge has a steel needle, when the two legs together, the two needle tips should overlap at one point. Figure 5 shows for the use of a minute gauge in the scale on the measurement of size, and then on the line continuous interception of equal length line segments of the method If you want to figure 5c shown in the AB line segments of four equal parts, can be left to self-testing estimates, will be divided into two needle tips open to about AB / 4 for the trial points, such as the remaining (or insufficient), and then will be between the tips of the distance between the needle open up (or reduce) e / 4, e for the remaining or insufficient amount, and then test points, until satisfactory Until satisfied. Trial points with the method can also be divided into circles or arcs. Second, the curve board: curve board is a common tool for drawing non-circular curves. When drawing a line, the first free hand will be gently connected to the points into a curve, as shown in Figure 8a; and then in the curve board to select the curvature of the part of the curve, divided into several sections of the points one by one into a curve, but each section should not be traced all the way through, at least leave a small section of the last two points between the next section, so that it matches the next section, in order to ensure that the curve of the smooth connection. Pencil type and application Drawing pencils are divided into two types: soft and hard, with the letter "B" indicating soft pencils and the letter "H" indicating hard lead. The larger the value before "B", the softer the lead; the larger the value before "H", the harder the lead. The letter "HB" means soft and hard lead core.