在生产中,经常会遇到角度精度较高的平面加工,特别是一些空间两面角的平面加工。这些角度的加工,靠划线或一般的分度头分度是难以保证加工精度的。且有些角度受零件结构的限制,在测量上也有一定的难度。在非大量生产的情况下,如设计专用的分度装置或采用高精度机床进行加工,则是不合算的。 In production, often encounter the angle of the plane precision machining, especially in some space two-sided corner machining. These angles of processing, marking or general indexing indexing is difficult to ensure the accuracy of the processing. And some angles are limited by the structure of the part, there is a certain degree of difficulty in the measurement. In the case of non-mass production, such as design-specific indexing device or the use of high-precision machine tools for processing, it is uneconomical.