Machinery's Handbook, 31st Edition
1148
Machining Power Table 2. Feed Factors, C , for Power Constants Inch Units SI Metric Units
Feed in. a 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 0.009 0.010 0.011 0.012 0.013
Feed in. a 0.014 0.015 0.016 0.018 0.020 0.022 0.025 0.028 0.030 0.032 0.035 0.040 0.060
Feed mm b 0.02 0.05 0.07 0.10 0.12 0.15 0.18 0.20 0.22 0.25 0.28 0.30 0.33
Feed mm b 0.35 0.38 0.40 0.45 0.50 0.55 0.60 0.70 0.75 0.80 0.90 1.00 1.50
C
C
C
C
1.60 1.40 1.30 1.25 1.19 1.15 1.11 1.08 1.06 1.04 1.02 1.00
0.97 0.96 0.94 0.92 0.90 0.88 0.86 0.84 0.83 0.82 0.80 0.78 0.72
1.70 1.40 1.30 1.25 1.20 1.15 1.11 1.08 1.06 1.04 1.01 1.00 0.98
0.97 0.95 0.94 0.92 0.90 0.88 0.87 0.84 0.83 0.82 0.80 0.78
0.98 0.72 a Turning, in/rev; milling, in/tooth; planing and shaping, in/stroke; broaching, in/tooth. b Turning, mm/rev; milling, mm/tooth; planing and shaping, mm/stroke; broaching, mm/tooth. Table 3. Tool Wear Factors, W Type of Operation W For all operations with sharp cutting tools 1.00 Turning: Finish turning (light cuts) 1.10 Normal rough and semifinish turning 1.30 Extra-heavy-duty rough turning 1.60-2.00 Milling: Slab milling 1.10 End milling 1.10 Light and medium face milling 1.10-1.25 Extra-heavy-duty face milling 1.30-1.60 Drilling: Normal drilling 1.30 Drilling hard-to-machine materials and drilling with a very dull drill 1.50 Broaching: Normal broaching 1.05-1.10 Heavy-duty surface broaching 1.20-1.30 Planing and Shaping Use values given for turning P m = power at the motor; hp, or kW K p = power constant (see Table 1a and Table 1b) Q = metal removal rate; in 3 /min or cm 3 /s (see Table 5) C = feed factor for power constant (see Table 2) W = tool wear factor (see Table 3) E = machine tool efficiency factor (see Table 4) V = cutting speed, fpm, or m/min N = cutting speed, rpm f = feed rate for turning; in/rev or mm/rev f = feed rate for planing and shaping; in/stroke, or mm/stroke
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