在工厂里,经常遇到在铸铁件的小直径孔中攻M5、M6及其他的螺纹。此道工序通常由钳工在装配时用手工进行加工。现在高雨基铣床工厂设计出一种藉摩擦力传动的夹头。利用这种夹头在铸铁件的孔中攻M5、M6及其他的螺纹时,可由钻工代替手工进行操作。此夹头构造如下(见图);壳体7藉中 In the factory, M5, M6 and other threads are often attacked in small diameter holes in castings. This process is usually carried out by fitters during assembly by hand. Now Hyundai-based milling machine factory designed a friction-driven chuck. Using this chuck in the hole in the cast iron attack M5, M6 and other threads, the drill can replace the manual operation. The collet is constructed as follows (see figure);