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In the ordinary lathe, the tailstock is used for drilling. If the operator does not care whether the power and structure of the lathe can meet the production process requirements, how many holes are drilled, how many holes are drilled. The result of this is very unfavorable for the lathe: On the one hand, when the cutting torque of the drilling hole is too large, the drill bit slips in the taper hole of the lathe sleeve of the lathe, and the surface of the tapered hole is seriously studied.