Q1) A double square threads power screw has a major diameter of 1.5 in. and a pitch of 3/16 in. The system coefficients are, f =0.95 and fc = 0.08. The other availables date are: de = 1.8 in, and F = 1450 Ibf per screw. Find: a) The torque required to raise and lower the load and the efficiency. b) The body stresses, torsional and compressive. c) The bearing stress. d) The thread stresses bending at the root, shear at the root, and maximum shear stress at the same location

Q1) A double square threads power screw has a major diameter of 1.5 in. and a pitch of 3/16 in. The system coefficients are, f =0.95 and fc = 0.08. The other availables date are: de = 1.8 in, and F = 1450 Ibf per screw. Find: a) The torque required to raise and lower the load and the efficiency. b) The body stresses, torsional and compressive. c) The bearing stress. d) The thread stresses bending at the root, shear at the root, and maximum shear stress at the same location

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Combined Loading

Any functioning component, such as machine parts, structural members, pressure vessels, and so on, are all under the influence of more than one force. When anybody is under the influence of more than one force such as shear forces, bending moments, axial forces, torsion, and so on, then such body is said to be under combined loading. A very practical example of combined loading is the crankshaft of an internal combustion engine (IC engine). The crankshaft of the IC engine is under high rpm, which is caused due to the torsional forces. Due to the presence of piston, counterbalances, and internal imbalances, the crankshaft experiences lateral forces and due to the rise in temperature, the crankshaft undergoes thermal expansion, which pulls the crankshaft along the axial direction and lateral direction. The presence of unbalanced loads along the periphery of the crankshaft also induces a bending moment.

Question

Q1) A double square threads power screw has a major diameter of 1.5 in. and a pitch
of 3/16 in. The system coefficients are, f =0.95 and f.= 0.08. The other availables
date are: dc = 1.8 in, and F = 1450 Ibf per screw.
Find:
a) The torque required to raise and lower the load and the efficiency.
b) The body stresses, torsional and compressive.
c) The bearing stress.
d) The thread stresses bending at the root, shear at the root, and maximum shear
stress at the same location

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