正弦座是一种利用三角正弦原理设计的工具。 它除了和正弦尺一样能作角度和锥度测量外,还可装在铣床、钻床、磨床上对精度要求很高的工件进行面或孔的测量(图1)。 它的结构很简单(图2),回转台2借精密弧面与基座1紧密配合,回转台侧边压入一滚柱6,滚柱中心与回转合的回转中心的距 Sine Block is a tool designed using the trigonometric sine principle. In addition to being able to make angle and taper measurements as well as sine scales, it can also be used for surface or hole measurements on highly accurate workpieces on milling machines, drilling machines and grinding machines (Figure 1). Its structure is very simple (Figure 2), turntable 2 by sophisticated arc with the base 1 in close cooperation, the turret side pressed into a roller 6, the center of the roller and rotary joint rotary center distance