Machinery's Handbook, 31st Edition
Machining Power
1147
Table 1b. Power Constants K p Using Sharp Cutting Tools
Brinell Hardness Number
Brinell Hardness Number
K p Metric Units
K p SI Metric Units
K p Inch Units
K p Inch Units
Material
Material
Wrought Steels Plain Carbon Steels
80-100 0.63 1.72 100-120 0.66 1.80 120-140 0.69 1.88 140-160 0.74 2.02 160-180 0.78 2.13 180-200 0.82 2.24 200-220 0.85 2.32 100-120 0.41 1.12 120-140 0.42 1.15 140-160 0.44 1.20 160-180 0.48 1.31 180-200 0.50 1.36 140-160 0.62 1.69 160-180 0.65 1.77 180-200 0.69 1.88 200-220 0.72 1.97 220-240 0.76 2.07 240-260 0.80 2.18 260-280 0.84 2.29 280-300 0.87 2.38 300-320 0.91 2.48 320-340 0.96 2.62 340-360 1.00 2.73 160-180 0.79 2.16 180-200 0.83 2.27 200-220 0.87 2.38
220-240 0.89 2.43 240-260 0.92 2.51 260-280 0.95 2.59 280-300 1.00 2.73 300-320 1.03 2.81 320-340 1.06 2.89 340-360 1.14 3.11 180-200 0.51 1.39 200-220 0.55 1.50 220-240 0.57 1.56 240-260 0.62 1.69 … … … 140-160 0.56 1.53 160-180 0.59 1.61 180-200 0.62 1.69 200-220 0.65 1.77 220-240 0.70 1.91 240-260 0.74 2.02 260-280 0.77 2.10 280-300 0.80 2.18 300-320 0.83 2.27 320-340 0.89 2.43 … … … … … … … … …
All Plain Carbon Steels
All Plain Carbon Steels
Free Machining Steels
AISI 1108, 1109, 1110, 1115, 1116, 1117, 1118, 1119, 1120, 1125, 1126, 1132
AISI 1137, 1138, 1139, 1140, 1141, 1144, 1145, 1146, 1148, 1151
Alloy Steels
AISI 4023, 4024, 4027, 4028, 4032, 4037, 4042, 4047, 4137, 4140, 4142, 4145, 4147, 4150, 4340, 4640, 4815, 4817, 4820, 5130, 5132, 5135, 5140, 5145, 5150, 6118, 6150, 8637, 8640, 8642, 8645, 8650, 8740
AISI 4130, 4320, 4615, 4620, 4626, 5120, 8615, 8617, 8620, 8622, 8625, 8630, 8720
AISI 1330, 1335, 1340, E52100
… … … The machine tool transmits the power from the driving motor to the workpiece, where it is used to cut the material. The effectiveness of this transmission is measured by the machine tool efficiency factor, E . Average values of this factor are given in Table 4. For mulas for calculating the metal removal rate, Q , for different machining operations are given in Table 5. These formulas are used together with others given below. The following formulas can be used with either customary inch or with SI metric units.
(1) (2)
K CQW p P c = E P c = P m =
E K CQW p
where P c = power at the cutting tool; hp, or kW
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