Interference fit

This page introduces formulas for calculating basic parameters necessary for machine cutting. The figures obtained from the calculations are for reference only. The conditions for machining depend on the machine tool you are using. Use the optimal conditions according to your actual machining circumstances.

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ISO 286

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This formula is used to calculate the theoretical finished surface roughness from the blade corner radius of the insert and the feed per revolution. Example: Feed per revolution (f) = 0.1 mm/revInsert’s blade corner radius (Re) = 0.5 mmIn this case, the theoretical finished surface roughness (h) is 2.5 µm.

ISO 2768

This formula is used to calculate the cutting speed from the spindle speed and the diameter of the workpiece. Example: Diameter (Dm) = 60 mmSpindle speed (n) = 500 min-1In this case, the cutting speed (vc) is approximately 94 m/min.

This formula is used to calculate the machining time from the length of the workpiece and the spindle speed. Example: Feed (f) = 0.2 mm/revSpindle speed (n) = 1100 min-1Length of workpiece (lm) = 120 mmFirst, the machined length per minute is calculated, in this case from the rotational speed and the feed amount. Machined length per minute (l) = n × f = 0.2 × 1100 = 220 mm/minSubstitute this into the formula: Tc = lm ÷ l = 120 ÷ 220 = 0.55 (min) × 60 = 33 (sec)The machining time (Tc) is approximately 33 seconds.

H7tolerance

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This formula is used to calculate the net power from the depth of cut, the feed per revolution, the cutting speed, the specific cutting force, and the machine efficiency. Example: Depth of cut (mild steel: ap) = 5 mmFeed per revolution (f) = 0.1 mm/revCutting speed (vc) = 140 m/minMachine efficiency (η) = 80% (0.8)Given: Specific cutting force (Kc) = 3610 MPaIn this case, the net power for machining (Pc) is 5.26 kW.

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Fittolerance

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ISO 286-2

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H8tolerance

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This formula is used to calculate the feed rate per revolution from the spindle speed and the length cut per minute. Example: Machined length per minute (l) = 150 mm/minSpindle speed (n) = 600 min-1In this case, the feed rate per revolution (f) is 0.25 mm/rev.