我们将原机加工钻头锥度改进成组装式,由定位套、活动尾扁和螺钉构成(图1、2、3)。它不但具有原功能,而且在使用上更方便了。卸钻头时不许用锤子和各型号楔铁,只需手握定位套,用力碰击尾扁。即可卸下,钻套尺寸可成系列,自制简单。尤其是将原来加 We modified the original machined drill bit taper into an assembly consisting of a positioning sleeve, an active tail and screws (Figure 1, 2, and 3). It not only has the original function, but also more convenient to use. When unloading the drill bit, it is forbidden to use the hammer and each type of wedge iron, only need to hold the positioning sleeve and hit the tail flatly. You can remove the drill sleeve size can be a series of self-made simple. In particular, the original plus