正弦规也称正弦尺。精度分为0级，1级。工作面的下方固定有两个直径相等且互相平行的圆柱体，正弦规的公切面与上工作面平行。根据测微仪在两端的示值之差可求得被测角度的误差。正弦规一般用于测量小于45°的角度，在测量小于30°的角度时，精确度可达3″～5″。正弦规是根据正弦函数原理，利用量块垫其一端，使之倾斜一定角度的检验定位工具。在主体侧面和前面分别装有可供被测件定位用的侧挡板它们分别垂直和平行于两圆柱的轴心线。In the right triangle in, sinα = H / L, the formula for the amount of H block group size, according to the measured angle be called the nominal angle. Sine is in line with principles of the use of block composition according to the standard sine angle for comparison in the horizontal direction by way of differential measurement point and the workpiece, the outer cone of a precision measuring instrument. Using the definition of measurement angle and the sine taper gauge, etc. It consists of a steel rectangular and fixed at its two ends the same diameter of steel cylinder form. Distance from the axis line of the two columns of 100 mm or L usually 200mm. The picture shows the use of a sine measurement cone gauge the situation. In the right triangle in, sinα = H / L, the formula for the amount of H block group size, according to the measured angle be called the nominal angle. According to micrometer values at both ends of the show, just like the angle obtained by the measured error. Sine generally less than 45 ° for measuring the angle measuring less than 30 ° of angle, accuracy up to 3 "5."
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