Machinery's Handbook, 31st Edition
Machining Power
1153
Table 8. Feed Factors F f for Drilling
Inch Units
SI Metric Units
Feed, in/rev 0.0005 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 0.009 0.010
Feed, in/rev 0.012 0.013 0.015 0.018 0.020 0.022 0.025 0.030 0.035 0.040 0.050
Feed, mm/rev
Feed, mm/rev
F f
F f
F f
F f
0.0023 0.004 0.007 0.010 0.012 0.014 0.017 0.019 0.021 0.023 0.025
0.029 0.031 0.035 0.040 0.044 0.047 0.052 0.060 0.068 0.076 0.091
0.01 0.03 0.05 0.08 0.10 0.12 0.15 0.18 0.20 0.22 0.25
0.025 0.060 0.091 0.133 0.158 0.183 0.219 0.254 0.276 0.298 0.330
0.30 0.35 0.40 0.45 0.50 0.55 0.65 0.75 0.90 1.00 1.25
0.382 0.432 0.480 0.528 0.574 0.620 0.708 0.794 0.919 1.000 1.195
Table 9. Drill Diameter Factors: F T for Thrust, F M for Torque Inch Units SI Metric Units
Drill Dia., in.
Drill Dia., in.
Drill Dia., mm
Drill Dia., mm
F T
F T
F T
F T
F M
F M
F M
F M
0.063 0.110 0.007 0.875 0.899 0.786 1.60 1.46 0.094 0.151 0.014 0.938 0.950 0.891 2.40 2.02 0.125 0.189 0.024 1.000 1.000 1.000 3.20 2.54
2.33 22.00 11.86 260.8 4.84 24.00 12.71 305.1
8.12 25.50 13.34 340.2 0.156 0.226 0.035 1.063 1.050 1.116 4.00 3.03 12.12 27.00 13.97 377.1 0.188 0.263 0.049 1.125 1.099 1.236 4.80 3.51 16.84 28.50 14.58 415.6 0.219 0.297 0.065 1.250 1.195 1.494 5.60 3.97 22.22 32.00 16.00 512.0 0.250 0.330 0.082 1.375 1.290 1.774 6.40 4.42 28.26 35.00 17.19 601.6 0.281 0.362 0.102 1.500 1.383 2.075 7.20 4.85 34.93 38.00 18.36 697.6 0.313 0.395 0.124 1.625 1.475 2.396 8.00 5.28 42.22 42.00 19.89 835.3 0.344 0.426 0.146 1.750 1.565 2.738 8.80 5.96 50.13 45.00 21.02 945.8 0.375 0.456 0.171 1.875 1.653 3.100 9.50 6.06 57.53 48.00 22.13 1062 0.438 0.517 0.226 2.000 1.741 3.482 11.00 6.81 74.90 50.00 22.86 1143 0.500 0.574 0.287 2.250 1.913 4.305 12.50 7.54 94.28 58.00 25.75 1493 0.563 0.632 0.355 2.500 2.081 5.203 14.50 8.49 123.1 64.00 27.86 1783 0.625 0.687 0.429 2.750 2.246 6.177 16.00 9.19 147.0 70.00 29.93 2095 0.688 0.741 0.510 3.000 2.408 7.225 17.50 9.87 172.8 76.00 31.96 2429 0.750 0.794 0.596 3.500 2.724 9.535 19.00 10.54 200.3 90.00 36.53 3293 0.813 0.847 0.689 4.000 3.031 12.13 20.00 10.98 219.7 100.00 39.81 3981 2 JW = 2 3 24 , 000 3 0 . 021 3 0 . 899 3 1 . 355 3 1 . 30 + 24 , 000 3 0 . 875 2 3 0 . 030 3 1 . 30 = 2313 lb M = K d F f F M AW = 24 , 000 3 0 . 021 3 0 . 786 3 1 . 085 3 1 . 30 = 559 in-lb P c MN W = 1.30 (From Table 3) T = 2 K d F f F T BW + K d d 559 350 × 63,025 ------------ 3.1 hp = = = P m P c E --- 3.1 0.80 ----- 3.9 hp = = = Twist drills are generally the most highly stressed of all metal cutting tools. They must not only resist the cutting forces on the lips, but also the drill torque resulting from these forces and the very large thrust force required to push the drill through the hole. Therefore, often when drilling smaller holes, the twist drill places a limit on the power used and for very large holes, the machine may limit the power. 63,025 ---------
Copyright 2020, Industrial Press, Inc.
ebooks.industrialpress.com
Made with FlippingBook - Share PDF online