Machining Power & Torque Calculator

How the machining power & torque calculator works

Ideal cutting kW = removal rate in cm³/min × specific cutting force in N/mm² ÷ 60,000. This incorporates cm³→mm³ and N·mm/min→kW conversion. Cutting torque in N·m = 30,000 × cutting kW ÷ (π × rpm). Divide cutting power by entered overall efficiency for estimated input.

Specific cutting force must be supplied for the actual material and process. Zero rpm makes torque unavailable; no spindle or motor rating is inferred from that ratio. Efficiency boundary, cutting conditions, engagement and measured versus predicted removal must be consistent. The tool does not recommend settings or certify equipment/tool suitability.

Quantities use the stated units and finite bounded inputs. Whole purchases round up under the documented model; cost components round half-up to cents before totals are summed. Undefined ratios stay unavailable. π and logarithms use normal numeric precision. Display rounding does not alter the entered assumptions.

Worked example

60 cm³/min at an entered 1,000 N/mm² gives 1 kW cutting power. At 80% overall efficiency input is 1.25 kW; at 1,000 rpm torque is about 9.549 N·m. Doubling removal rate doubles cutting power to 2 kW.

Sources and assumptions

The source material explains the underlying calculation or pricing structure. Entered prices, costs, schedules and scenario choices are your assumptions; this tool does not obtain supplier quotes or predict actual results.

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