Answered: Double- drum winder

Precision Machining Technology (MindTap Course List)

2nd Edition

ISBN:9781285444543

Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Publisher:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Chapter3: Job Planning, Benchwork, And Layout

Section3.6: Drilling, Threading, Tapping, And Reaming

Problem 4RQ: Explain the purpose of a counterbore.

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A double-drum winder is used as a stage hoist for the sinking of a vertical shift. The stage is suspended in the vertical shaft by two winding ropes in double purchase, the fixed ends being anchored in the headgear. Each rope has a strength of 890 kN when new, and a mass of 5.38 kg/m. The empty stage has a mass of 18360 kg. The minimum factor of safety permitted for ropes is 5 at discard, but allowance must be made for 5% deterioration before discard. The shaft is being sunk to a depth of 1830 m below the headgear sheaves.

Calculate the maximum mass load that can be placed on stage, including persons and material.

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