Grp27: Encasement

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Material: Cast Aluminum

Quantity: 1

Manufacturing Process: Heated liquid aluminum is cooled in a mold to form the encasement. Certain areas are then brushed to produce a close to frictionless surface or to allow the component to achieve a stronger bond with another component.

Function: Encase the crankshaft and pistons.


Cast Aluminum was chosen for the encasement because it’s strong yet light. It will protect the shaft and pistons but not bog down the machine. It’s also less expensive then many other material options.

Gravity. The pistons and crankshaft slide through and as such do not create a large force. There are numerous screw forces throughout the encasement holding the front plate, right plate, and the crankshaft entryway onto the encasement.

The material choice does not affect the manufacturing process because cast aluminum mold manufacturing is rather commonplace.

The shape affects the manufacturing process only in forming the mold, which is a well-researched and efficient process now.

The cast aluminum manufacturing process was chosen for it’s efficiency, cost, and because aluminum comes out a light, strong material.

This component is very functional. It protects the crankshaft and pistons and also allows for the crankshaft to extend protected from the engine to the pistons. It also sits comfortably within the entire casing of the pressure washer. It has brushed aluminum surfaces where there are large amounts of contact with other components.

I believe the cast iron manufacturing process was chosen because comparatively to other options it is cheaper and as or more efficient. Aluminum is also a light material but provides the protection needed.

This component is not too complex. It has relatively frictionless holes for the pistons to slide through and screw holes to connect various other components to it. It is essentially a shell.