There is no exact definition of so-called deep holes. It is generally considered that the ratio of the pore depth to the pore diameter is larger than 5 to 10, and even the pores of 100 or more are called deep pores. First, the shortcomings of twist drilling deep hole drilling Deep hole drilling has long been so that manufacturers who have not used deep hole machining special machine tools are drilling with twist drills. This processing method has the following disadvantages:
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