1 users must according to pass machining parts and straight hole size reasonable selection of center drilling model.
2 workpiece hardness should be the most 170-200HB.
3 tool before use, must be washed antirust oil, so as not to affect the cutting performance of chip stick over the edge.
4 is a workpiece surface processing should be straight, there shall be no blisters or hard points, so as to avoid cutter damage.
5 the center drill before drilling shall reach the desired position accuracy.
7 cutting fluid processing object selection: according to different cutting fluid,cooling should be fully.
8 appeared in the processing of the abnormal situation should immediately stop, find out the reason behind the processing; pay attention to wear edge timely repair; tool to clean oil after use, the safekeeping.