有一些零件需要在圆周上钻出等分度的孔,如法兰盘等。如果是批量生产,一般可用样板或专用夹具压钻;但在种类繁多而批量较少的情况下,使用专门工具就很不合算。这里介绍一种通用钻具,用这种钻具只需在工件上校正第一个孔跟钻具中心的距离,即可方便地钻出工件上的等分孔。适用于多品种的小批生产。工具的构造如附图所示。图中1是三爪卡盘,固定在刻度盘2上。刻度盘2的外圆刻有分度线,并钻有六个孔;刻度盘2跟底座3滑动配合。4是螺钉,它通过压铁5,使刻度盘2固定在 Some parts need to drill on the circumference of the circle equally divided, such as flanges. If it is mass-produced, generally available model or special fixture pressure drill; but in a wide range of small quantities, the use of specialized tools is not cost-effective. Here is a general-purpose drill, with which it is easy to drill a hole in the workpiece by simply calibrating the distance between the first hole and the center of the drill on the workpiece. Suitable for many varieties of small batch production. The construction of the tool is shown in the attached drawing. Figure 1 is a three-jaw chuck, fixed on the dial 2. The outer circle of the scale 2 is engraved with an index line and drills six holes. The scale 2 slides with the base 3. 4 is a screw, which through the iron 5, the dial 2 fixed in the