在各种机床夹具的制造中,都有一些关于点与点、线与线、面与面、或点与面、点与线、线与面的尺寸。这些尺寸,有些是在同一平面上,有些是在异面上,还有一些是属于空间尺寸。这些空间尺寸,在图纸上虽然容易标注,但加工或测量却比较困难。不能用直接的方法,而只能用间接的方法。根据多年实践,我们认为利用工艺孔这一间接方法,可使加工和测量方 In the manufacture of various machine tool fixtures, there are some on the point and point, line and line, surface and surface, or point and surface, point and line, line and surface dimensions. Some of these dimensions are on the same plane, some are on the opposite side, and others are on the space dimension. These space dimensions, although easy to mark on the drawings, but the processing or measurement is more difficult. Can not use the direct method, but only with indirect methods. Based on many years of practice, we believe that using the indirect method of process holes allows the machining and measuring side