简单实用的钻床攻丝夹具江西第二化肥厂修造分厂吴承彪在生产中经常要在一些零件上攻丝，由于我厂没有攻丝机，一般都是采用手工攻丝。手工攻丝只能攻一些小规格尺寸，Ｍ２０以上的螺纹则很难攻，工人劳动强度大，效率低。我设计出一个简便实用的夹具（见图），实践证明，... Simple and practical drilling tapping fixture Jiangxi Second Fertilizer Plant to build branch Wu Cheng Biao in production often have to tap some of the parts, because I do not have tapping machine plant, are generally used manual tapping. Manual tapping can only attack some small size, M20 thread is very difficult to attack, workers labor-intensive, low efficiency. I designed a simple and practical fixture (see photo), the practice proved that ...