A QUICK WALKTHROUGH

How to use this tool

Enter MRR in mm³/min and kc in N/mm² for the direct estimate.
Optionally choose turning mode and enter cutting speed, depth of cut, feed, approach angle, kc1, mc, and γ0 correction.
Calculate, review the assumptions, then copy or download the report.

Formula and units

Direct estimate: Pc (kW) = MRR (mm³/min) × kc (N/mm²) ÷ 60,000. Turning Kienzle mode: h = fn × sin(KAPR); kc = kc1 × (1/h)^mc × (1 − γ0/100); Pc = vc × ap × fn × kc ÷ 60,000, where vc is m/min, ap and fn are mm, h is mm, kc1 is N/mm², and γ0 is degrees expressed as the user-entered percent correction shown in the formula.

Scope and assumptions

Estimates ideal cutting power only. Enter coefficients from an appropriate technical source for your material, tool, and operation. No material database, tool or machine rating, drive efficiency, or equipment recommendation is provided. The Kienzle option is a simplified turning model and is not a substitute for validation.

References

Sandvik Coromant, Formulas and definitions for turning, H84 technical reference (Kienzle specific cutting force model): https://cdn2.sandvik.coromant.com/files/sitecollectiondocuments/elearning/formulas-and-definitions/h84_turning_formulas_jpn_metric.pdf. Sandvik Coromant, Specific cutting force: https://www.sandvik.coromant.com/en-us/knowledge/materials/specific-cutting-force. Use your own applicable kc1 and mc values; this tool does not supply material values.

Local processing

All calculations run in this browser. Inputs and reports are not uploaded.

GOOD TO KNOW

Common questions

Does this recommend a machine or material coefficient?

No. Provide applicable coefficients yourself; the result is an estimate and does not check ratings or suitability.