絲錐的柄部一般是在車床上采用圆料車細的办法加工;这样,大量的金属被車成铁屑浪费掉。杭州工具厂采用柄部縮细工艺,可节約材料1/3左右。現介绍如下,供参考。机床外观见图1。 Tap handle is generally used in the lathe round car fine way processing; In this way, a lot of metal was car into iron waste wasted. Hangzhou Tools Factory handle narrowing process can save about 1/3 of the material. Now introduced as follows for reference. Machine appearance shown in Figure 1.