Grp27: Crank Shaft

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Crank Shaft

Material: Machined Steel

Quantity: 1

Manufacturing Process: Crankshaft is first cast, then the journals, and bearing surfaces are ground and the hole is drilled and tapped. Key way is made by broaching.

Function: Rotates, and delivers power to the pistons so that they can move up and down.

Part Number: 6


The width of each lobe is .629 inches. Diameter of each lobes is .407 inches. Length of entire shaft is 6.471 inches. Diameter of threaded hole on left side of shaft is .232 inches

Steel was selected because it is a hard metal that can stand the hard forces applied to it. It is resistant to corrosion, and takes very long to wear.

There is torque acting on the shaft from the engine that makes it rotate. There is also a resulting force from the pistons as they try to compress the air in the cylinders.

The estimated magnitude of the torque is 6.75 ft/lbs. The resulting force is estimated at 164 lbs.

The material choice does effect the process. Since the shaft is steel, more tool wear is created, and more time and work is needed in order to make this shaft.

This shape does effect the process. Because of its obscure shape the manufacturing process can take longer than expected.

Each manufacturing process listed above was chosen so the part was made with the precision it needs. This process was also most likely the most effective way to make this component.

This component is functional. It was designed for how it functioned, and not for how it looked.

This component has a particular shape. This is so as the shaft rotates the lobes can move the pistons up and down.

This process was chosen because it utilized the steel, with out really effecting its strength.

On a scale from 1-5, 1 being the simple like a ball, and 5 being complex like a engine, this component is a 1. This component is some what simple, but the process of the moving lobes is quite unique.