(10) The lead screw of a lathe has a 2.0-in Acme thread, 2%2TPI. To drive the tool carriage, this screwmust exert an axial force of 600lb. The thrust is carried on the collar 4½-in outside diameter & 244-in in inside diameter. The lead screw revolves 30rpm. Determine:(a) the efficiency of the screw & the collar, assuming f = 0.15 & fc = 0.10;(b) the power to drive the screw.

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The lead screw of a lathe has a 2.0-in Acme thread, 2½TPI. To drive the tool carriage, this screw must exert an axial force of 600lb. The thrust is carried on the collar 4½-in outside diameter & 214- in in inside diameter. The lead screw revolves 30rpm. Determine: (a) the efficiency of the screw & the collar, assuming f, = 0.15 & fc = 0.10; (b) the power to drive the screw.

The lead screw of a lathe has a 2.0-in Acme thread, 2½TPI. To drive the tool carriage, this screw must exert an axial force of 600lb. The thrust is carried on the collar 4½-in outside diameter & 214- in in inside diameter. The lead screw revolves 30rpm. Determine: (a) the efficiency of the screw & the collar, assuming f, = 0.15 & fc = 0.10; (b) the power to drive the screw.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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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.

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(10) The lead screw of a lathe has a 2.0-in Acme thread, 2%2TPI. To drive the tool carriage, this screw
must exert an axial force of 600lb. The thrust is carried on the collar 4½-in outside diameter & 244-
in in inside diameter. The lead screw revolves 30rpm. Determine:
(a) the efficiency of the screw & the collar, assuming f = 0.15 & fc = 0.10;
(b) the power to drive the screw.

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