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4_ch 14 Mechanical Design budynas_SM_ch14

# 4_ch 14 Mechanical Design budynas_SM_ch14 -...

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Using coarse integer pitches from Table 13-2, the following table is formed. Pd V K v W t F 2 9.000 1413.717 2.178 58.356 0.082 3 6.000 942.478 1.785 87.535 0.152 4 4.500 706.858 1.589 116.713 0.240 6 3.000 471.239 1.393 175.069 0.473 8 2.250 353.429 1.295 233.426 0.782 10 1.800 282.743 1.236 291.782 1.167 12 1.500 235.619 1.196 350.139 1.627 16 1.125 176.715 1.147 466.852 2.773 Other considerations may dictate the selection. Good candidates are P = 8( F = 7 / 8in) and P = 10 ( F = 1 . 25 in) . Ans. 14-10 Try m = 2mm which gives d = 2(18) = 36 mm and Y = 0 . 309 . V = π (36)(10 3 )(900) 60 = 1 . 696 m/s Eq. (14-6 b ): K v = 6 . 1 + 1 . 696 6 . 1 = 1 . 278 W t = 60(1 . 5)(10 3 ) π 3 )(900) = 884 N Eq. (14-8): F = 1 . 278(884) 75(2)(0 . 309) = 24 . 4mm Using the preferred module sizes from Table 13-2: md V K v W t F 1.00 18.0 0.848 1.139 1768.388 86.917 1.25 22.5 1.060 1.174 1414.711 57.324 1.50 27.0 1.272 1.209 1178.926 40.987 2.00 36.0 1.696 1.278 884.194 24.382 3.00 54.0 2.545 1.417 589.463 12.015 4.00 72.0 3.393 1.556 442.097
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