Estimate cutting force and spindle torque from specific cutting force, depth of cut, feed per tooth and the number of teeth in cut — the check that tells you whether the part or the fixture will move.
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Request a Proposal →Cutting force depends on the material-specific cutting force coefficient (kc), axial depth of cut (ap), feed per tooth (fz), and radial engagement (ae). This calculator gives the tangential force and resulting spindle torque.
kc is the force required to cut 1 mm² of material. It varies by material type, hardness, and tool geometry. Typical values range from 700 N/mm² (aluminium) to 3500 N/mm² (superalloys).
Radial engagement (ae) determines the width of cut. Higher engagement means more of the tool is in contact with the material, increasing the total cutting force proportionally. For slotting (full engagement), ae equals the tool diameter.
Real-world forces vary due to tool wear, runout, vibration, chip thinning at low radial engagement, and machine rigidity. Use this result as a starting estimate and adjust based on your specific setup.
Enter your material's specific cutting force (kc), depth of cut, feed per tooth, and radial engagement. Use the calculated force and torque to verify your spindle can handle the load and to size workholding fixtures.
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