Drilling machine clamping apparatus has cutting tool mostly oriented device, reason customarily calls jig. According to structural characteristic, jig can be divided for stationary jig, circumgyrate type jig, retroflexion jig of jig of type of type jig, cover board and slippery pillar. Jig design is gotten set auger covering is the component that guides cutting tool, in order to assures the treatment position of aperture, what prevent the cutting tool in machining a process is deflective. Its type includes to have: Fixed auger set, can change auger cover and special auger set; Jig gets pattern plate to be used at installation getting to cover; The clamping apparatus body of jig of clamping apparatus body does not set fixed position or oriented plant commonly, clamping apparatus is through placing specific underside to put on drilling machine workbench, can use directly auger set search to using pressing plate impaction. CNC Milling