为适应产品批量生产中钻孔、攻丝的需要,我们将一台废旧的台钻,改装成如图所示的简易攻丝机,比手工攻丝提高效率20倍以上,自1974年投入使用至今,收到了较为满意的效果。该机改装后仍可钻孔、铰孔。一般台钻转速为500～4000r/min,这样高的转速,用于攻丝是不合适的。故在电动机与主轴槽轮之间加上一台1∶6的两级变速箱,使原来台钻五档 In order to meet the needs of drilling and tapping in mass production, we converted a worn bench drill to a simple tapping machine as shown in the figure, which increased efficiency by 20 times or more than manual tapping and put into use since 1974 So far, received a more satisfactory results. The machine can still be modified after drilling, reaming. General bench drill speed of 500 ~ 4000r / min, such a high speed, for tapping is not appropriate. Therefore, between the motor and spindle sheave plus a 1: 6 two-stage gearbox, so that the original bench drill five files