Turning - formulas

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Cutting speed opis Vc - cutting speed [m/min]
n - revolution [rev/min]
D - workpiece diameter [mm]
Revolution opis
Feed per minute opis Fmin - feed per minute [mm/min]
Fn - feed per revolution [min/obr]
Finished surface roughness opis Rmax - finished surface roughness
Re - insert corner radius [mm]
Cutting time opis Tc - machine cutting time [min]
L - workpiece lenght [mm]
Cutting power opis Pc - aktual cutting power [kW]
ap - deep of cut [mm]
Kc - specific cutting force [Mpa]
n - machine coefficient
Work material Tensile strenght (MPa) or hardness Specific cutting force Kc (MPa)
feed
0,1 [mm/obr]
feed
0,2 [mm/obr]
feed
0,3 [mm/obr]
feed
0,4 [mm/obr]
feed
0,6 [mm/obr]
Milde steel 520 3610 3100 2720 2500 2280
Medium steel 620 3080 2700 2570 2450 2300
Hard steel 720 4050 3600 3250 2950 2640
Tool steel 670 3040 2800 2630 2500 2400
Tool steel 770 3150 2850 2620 2450 2340
Chrome Manganese steel 770 3830 3250 2900 2650 2400
Chrome manganese steel 630 4510 3900 3240 2900 2630
Chrome molibdenum steel 730 4500 3900 4300 3150 2850
Chrome molibdenum steel 600 3610 3200 2880 2700 2500
Nickel chrome molibdenum steel 900 3070 2650 2350 2200 1980
Nickel chrome molibdenum steel 352 HB 3310 2900 2580 2400 2200
Hard cast iron (GGG) 46 HRC 3190 2800 2600 2450 2270
Mechante cast iron 360 2300 1930 1730 1600 1450
Grey cast iron 200 HB 2110 1800 1600 1400 1330




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