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Engineering Expert Witness Blog



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



Last Build Date: Mon, 25 Sep 2017 18:27:34 +0000

 



What Came First? The Wheel or the Flywheel?

Mon, 25 Sep 2017 18:27:34 +0000

What came first? The wheel or the flywheel? Archeologists have been debating this question for decades. One thing is certain, they both date back to prehistoric times.



Optimizing Belt Width in a Pulley-Belt Assembly

Fri, 15 Sep 2017 15:15:53 +0000

We can use a belt of minimum width of 3.22 inches to safely transmit 4 horsepower from the engine to the pump without incurring breakage and slippage along the belt, thereby optimizing power transmission within our assembly.



Unit Conversion, Horsepower to Foot-Pounds per Second

Mon, 04 Sep 2017 20:55:10 +0000

To smooth things out we’ll have to do some converting of units. We’ll start by dividing V by 60 seconds per minute so it can be expressed in units of feet per second,



Tangential Velocity Dangers

Mon, 28 Aug 2017 14:15:45 +0000

We've been discussing tangential velocity within the context of a pulley and belt assembly in recent blogs, and you may have wondered whether you encounter this phenomenon in your everyday life.



Belt Velocity

Mon, 21 Aug 2017 14:30:22 +0000

Today we’ll plug numbers into this equation and arrive at a numerical value for this belt velocity.



Tangential Velocity

Mon, 14 Aug 2017 13:55:54 +0000

Why speak in terms of tangential velocity rather than plain old ordinary velocity?



The Mechanical Power Formula in Pulley and Belt Assemblies

Sat, 29 Jul 2017 18:57:54 +0000

Generally speaking, power, P, is equal to work, W, performed per unit of time, t, ...



Determining Angle of Wrap

Mon, 17 Jul 2017 19:57:12 +0000

Sometimes things which appear simple turn out to be rather complex. Such is the case with the Euler-Eytelwein Formula, a small formula with a big job.



The Angle of Wrap Formula

Thu, 06 Jul 2017 00:02:29 +0000

    Last time we introduced a scenario involving a hydroponics plant powered by a gas engine and multiple pulleys.   Connecting the pulleys is a flat leather belt.  Today we’ll take a step further towards determining what width that belt needs to be to maximize power transmission efficiency.   We’ll begin by revisiting the two T’s of […]



What Belt Width does a Hydroponics Plant Need?

Fri, 23 Jun 2017 12:43:38 +0000

An engineer is tasked with designing an irrigation system for a hydroponics plant. Pulley 1 is connected to the shaft of a water pump, while Pulley 2 is connected to the shaft of a small gasoline engine.