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Engineering Expert Witness Blog

Published by Philip J. O'Keefe, PE, MLE

Last Build Date: Thu, 25 May 2017 18:02:10 +0000


Angle of Wrap in the Euler-Eytelwein Formula

Thu, 25 May 2017 17:58:14 +0000

    Last time we learned that the two T’s in the Euler-Eytelwein Formula correspond to different belt tensions on either side of a pulley wheel in a pulley-belt assembly. Today we’ll see what the remaining variables in this famous Formula are all about, paying special attention to the angle of wrap that’s formed by the […]

The Two T’s of the Euler-Eytelwein Formula

Sun, 14 May 2017 18:52:09 +0000

    Last time we introduced some of the variables in the Euler-Eytelwein Formula, an equation used to examine the amount of friction present in pulley-belt assemblies.   Today we’ll explore its two tension-denoting variables, T1 and T2.    Here again is the Euler-Eytelwin Formula,where, T1 and  T2 are belt tensions on either side of a pulley, T1 = […]

A First Look at the Euler-Eytelwein Formula

Sat, 06 May 2017 01:33:46 +0000

Ideally, you want no slippage between belt and pulleys, but the only way for that to happen is if you have perfect friction between their surfaces....

A Pulley Speed Ratio Formula Application

Sat, 22 Apr 2017 01:27:49 +0000

Now, let’s apply Equation (1) to an example in which a blower must deliver a specific air flow to a building’s ventilating system.

Pulley Diameter Determines Speed

Sat, 08 Apr 2017 10:57:52 +0000

    Soon after the first pulleys were used with belts to transmit mechanical power, engineers such as Leonhard Euler and Johann Albert Eytelwein discovered that the diameter of the pulleys used determined the speed at which they rotated.   This allowed for a greater diversity in mechanical applications.   We’ll set up an examination of this phenomenon today. […]

The Difference Between Driven and Driving Pulleys

Fri, 31 Mar 2017 18:56:34 +0000

Our example of a basic mechanical power transmission system consists of two pulleys connected by a drive belt.

Johann Albert Eytelwein, Engineering Trailblazer

Mon, 20 Mar 2017 14:20:10 +0000

Today we’ll introduce his contemporary and partner in science, Johann Albert Eytelwein, a German mathematician and visionary, a true engineering trailblazer...

Leonhard Euler, a Historical Figure in Pulleys

Thu, 09 Mar 2017 22:33:02 +0000

Euler authored his first theoretical essays on the science and mathematics of pulleys after experimenting with combining them with belts in order to transmit mechanical power.

So How Much Friction is Present in our Compound Pulley?

Tue, 28 Feb 2017 14:28:55 +0000

Today we’ll calculate just how much friction is present within the example compound pulley we’ve been working with.

A Compound Pulley’s Numerical Puzzle is Like a Rubik’s Cube

Wed, 15 Feb 2017 16:04:23 +0000

Today we’ll get two steps closer to demonstrating this reality as we work a compound pulley’s numerical puzzle, shuffling equations like a Rubik’s Cube ...