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这种接长钻头的方法,不需要焊接,也不用固定螺钉。因为采用了接合销钉的装配方法,所以,更换钻头容易。接长方法如图所示。在接
This method of connecting long drill, do not need to weld, do not have to fix the screw. Because of the attachment method of the engaging pin, it is easy to change the bit. Then long method as shown. In the pick