在钳工按图放样、划线时,有时不宜直接使用角度尺和分度头。下面将我实践中用直尺和圆规作任意角的方法简做介绍。本作法能直接作出a≤35°的任意角,误差很小,而对a>35°的角,则误差较大,不宜采用,但可与60°、90°等特殊角的作法配合使用(图2)。下面着重讨论α≤35°的任意角的作法: 一、作法:(图1)求作α=25° 1.n=360。/25。=72/5。 2.选择直径AB=36毫米,作圆O。 Fitter in the bench lofting, marking, and sometimes should not be used directly to the angle ruler and indexing head. The following will be my practice with ruler and compasses for any angle method Jane to introduce. This practice can directly make a ≤ 35 ° of any angle, the error is small, and a> 35 ° angle, the error is larger, not used, but with the 60 °, 90 ° and other special practices with the use of figure 2). The following focuses on the practice of any angle α ≤ 35 °: First, the practice: (Figure 1) For α = 25 ° 1.n = 360. / 25. = 72/5. 2. Select the diameter AB = 36 mm, round O.