6_ch 07 Mechanical Design budynas_SM_ch07

6_ch 07 Mechanical Design budynas_SM_ch07 -...

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Chapter 7 183 (b) xy-plane M xy =− 131 . 1 x + 15 ± x 1 . 75 ² 2 15 ± x 9 . 75 ² 2 62 . 3 ± x 11 . 5 ² 1 M max occurs at 6.12 in M max 516 lbf · in M C = 131 . 1(5 . 75) 15(5 . 75 1 . 75) 2 = 514 Reduced from 754 lbf · in. The maximum occurs at x = 6 . 12 in rather than C , but it is close enough. xz-plane M xz = 17 . 4 x 6 ± x 1 . 75 ² 2 + 6 ± x 9 . 75 ² 2 + 206 . 6 ± x 11 . 5 ² 1 Let M net = ± M 2 + M 2 Plot M net ( x ) 1 . 75 x 11 . 5in M max = 516 lbf · in at x = 6.25 in Torque: In both cases the torque rises from 0 to 192 lbf · in linearly across the roller and is steady until the coupling keyway is encountered; then it falls linearly to 0 across the key.
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