按C的提议,制成了一种特殊的镗孔附件(图1),而且已经被采用了。该附件是在车床上镗六面孔用的。附件是由固定於轴上的花盘1, 形板2和带弹簧夹头的心轴3所组成。弹簧夹头是夹加工另件5用的。螺母4能紧压弹簧夹头和加工另件。 机体8是装於车刀架9上。夹具7是装在机体的槽中,下端 According to C’s proposal, a special boring accessory (Figure 1) has been made which has been adopted. The attachment is used on a lathe for boring six faces. The attachment consists of a face plate 1, a plate 2 and a mandrel 3 with a collet attached to the shaft. Collet chuck is used to process another piece 5. Nut 4 can be pressed against the collet chuck and machined parts. The body 8 is mounted on the tool holder 9. Fixture 7 is installed in the body of the tank, the lower end