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the inner hole should be drilled with the drill bit of the previous base hole to discharge the residual debris
they are suitable for small-scale roughing and the machining of less complex workpieces
General drill bit is more suitable for plane drilling
full cutting should be avoided as much as possible
higher temperature
BB 50mm Lenghth 3xD Carbide Drill External Coolant Efficient CNC Drilling Tool BB2055(0.3~4.0mm) left hand reamer the inner hole should beBB 3xD Solid Carbide Drill Please note that there are two types of drill bits: internal cooling (with cooling holes) and external cooling (without cooling holes). Please be careful to select when placing an order. Recommended for material hardness within 40RC Internal Cooling Higher machining precision, better surface finish, uniform heat dissipation, prolonged tool life, and enhanced operational safety Drilling example SUS304, 6. 7mm RPM: 2300 Feed:
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