How to Calculate Power Requirements for Deep Hole Drilling
I calculate power requirements before selecting a machine for any deep hole drilling job. The machine spindle must have enough power to drive the drill at the required speed and feed without stalling or bogging down in tough material. Underpowered machines produce inconsistent hole quality and short tool life. The Basic Power Formula The standard formula I use every time is Power (kW) = Torque (Nm) x RPM / 9550. For a 10 mm gun drill in mild steel running at 3000 RPM with 10 Nm of torque: Power = 10 x 3000 / 9550 = 3.1 kW. That gives me the power at the tool tip, not at the motor. ...