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正弦规通常只用于测量斜度,但配合使用一只圆柱,通过一定计算,就可以在许多情况下用来测定空间尺寸,具有用途广泛和精确、简便的优点。下面先推导出基本方程,再举若干实例。图1为有两个斜面的零件,测量方法如图2所示,用量块将正弦规右端抬高,使1面调平,于是可测出倾斜角a_1。再在零件侧面靠放一个圆柱,测出1面到圆柱中心的尺寸A_1。将座标原点设在圆柱中心,X轴和正弦规台面平行,则1面上任一点P的座标x、y之间有以下关系:A_1=ycosa_1-xsina_1(1)
Sine gauge is usually only used to measure the slope, but with the use of a cylinder, through a certain calculation, can be used in many cases to determine the size of the space, with a wide range of uses and accurate, simple advantages. The following first derive the basic equations, to name a few examples. Figure 1 is a part with two beveled surfaces. The measuring method is shown in Fig. 2. The measuring block is used to raise the right end of the sine gauge so as to level the surface of the sine. Thus, the tilt angle a_1 can be measured. Then put a cylinder on the side of the part and measure the dimension A_1 from the center to the center of the cylinder. The coordinate origin is set at the center of the cylinder, and the X-axis is parallel to the sine-gauge surface. Then, the relationship between the coordinates x and y of any point P on one surface is as follows: A_1 = ycosa_1-xsina_1 (1)