Compute the torque required to raise the load of 30 000 lb with the Acme screw selected
Question:
Compute the torque required to raise the load of 30 000 lb with the Acme screw selected in Problem 5. Use a coefficient of friction of 0.15.
Data in Problem 5.
If an Acme-thread power screw is loaded in tension with a force of 30 000 lb, what size screw from Table 17–1 should be used to maintain a tensile stress below 10 000 psi?
Transcribed Image Text:
TABLE 17-1 Preferred Acme Screw Threads Nominal major diameter, D (in) 1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1 1/ 13/ 2 23 3 4 Threads per in, n 16 14 12 12 10 8 6 6 5 5 5 4 4 4 4 3 3 3 2 2 2 2 2 5 aPer inch of length of engagement. Pitch, p = 1/n (in) 0.0625 0.0714 0.0833 0.0833 0.1000 0.1250 0.1667 0.1667 0.2000 0.2000 0.2000 0.2500 0.2500 0.2500 0.2500 0.3333 0.3333 0.3333 0.5000 0.5000 0.5000 0.5000 0.5000 Minimum minor diameter, D, (in) 0.1618 0.2140 0.2632 0.3253 0.3594 0.4570 0.5371 0.6615 0.7509 0.8753 0.9998 1.0719 1.1965 1.4456 1.6948 1.8572 2.1065 2.3558 2.4326 2.9314 3.4302 3.9291 4.4281 Minimum pitch diameter, D, (in) 0.2043 0.2614 0.3161 0.3783 0.4306 0.5408 0.6424 0.7663 0.8726 0.9967 1.1210 1.2188 1.3429 1.5916 1.8402 2.0450 2.2939 2.5427 2.7044 3.2026 3.7008 4.1991 4.6973 Tensile stress area, A, (in²) 0.026 32 0.044 38 0.065 89 0.097 20 0.1225 0.1955 0.2732 0.4003 0.5175 0.6881 0.8831 1.030 1.266 1.811 2.454 2.982 3.802 4.711 5.181 7.388 9.985 12.972 16.351 Shear stress area, Aç (in²)a 0.3355 0.4344 0.5276 0.6396 0.7278 0.9180 1.084 1.313 1.493 1.722 1.952 2.110 2.341 2.803 3.262 3.610 4.075 4.538 4.757 5.700 6.640 7.577 8.511
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Related Book For
Machine Elements In Mechanical Design
ISBN: 9780134441184
6th Edition
Authors: Robert Mott, Edward Vavrek, Jyhwen Wang
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