Multiple Pulley's Lifting Mechanical Advantage

Mechanics and Machines Calculations Menu

The illustration below shows a combination of a double and triple block pulley system. The pulleys each turn freely on a pin as axis, and are drawn with different diameters, to show the parts of the rope more clearly. There are 5 parts of rope.

Note: For rope (n1, n2, etc.), the velocity which the weight W will be raised equals of the velocity of the force applied at F.

Force to Raise Load:

F = eW/n

Pulley Mechanism

Weight Lifted by known force:

W = nF/e

Velocity ratio VR = n

where: n = number of ropes between the sets of pulleys (= 5 in figure).

Where:

W = Unknown weight
F = Applied force
n = number of ropes or cables
e = efficiency

Contribute Article Spider Optimizer

© Copyright 2000 - 2017, by Engineers Edge, LLC www.engineersedge.com
All rights reserved
Disclaimer | Feedback | Advertising | Contact

Spider Optimizer

Home
Engineering Book Store
Engineering Forum
Excel App. Downloads
Online Books & Manuals
Engineering News
Engineering Videos
Engineering Calculators
Engineering Toolbox
Engineering Jobs
GD&T Training Geometric Dimensioning Tolerancing
DFM DFA Training
Training Online Engineering
Advertising Center


Copyright Notice

Publishing Program