Grp27: Left Shaft Bearing
Left Shaft Bearing
Material: Machined Steel and Hard Plastic
Manufacturing Process: Bearing Cap is pressed for indentation to fit over steel balls. Balls and Cap are pressed into the housing. Bearing house is turned on a lathe.
Function: Helps create a frictionless smooth rotation of shaft.
Part Number: 6304-2RS
Encased in bearing is smaller spherical balls and a type of lubricant. This is so the bearing does not seize due to heat or wear. Diameter of bearing is 2.49 inches. Inner diameter is .9 inches
Machined steel was selected to make this component because it is a very hard metal. It also is less likely to wear and corrode. Bearings need to be made out of something that won't oxidize and rust easily, and machine steel is just that.
Torque is a force applied to this bearing. It is applied when the shaft is rotated inside the bearing. Frictional force is also another force applied to this component. Though very minimal, it works against the direction of the movement of the shaft. A uniform compression force around the circumference of the bearing is also applied. This force keeps the bearing pressed into the aluminum shell.
The magnitude of torque is estimated to be 6.75 ft/lbs. The frictional force on the inside of the bearing is very close to zero, but the frictional force on the inside pressed into the shaft as well as the outside of the bearing pressed into the aluminum shell is estimated to be about 6 lbs uniformly around the inner and outer radius of the bearing.
The material choice does effect the process. Different types of metals are easier to machine than steel.
The shape does effect the manufacturing process, If it was to be another shape then a lathe would not be used. Instead, either a mill or some other process would be used to create the shape. If the new shape was close to the shape of a circle such as if it was changed to an ellipse, then a lathe would most likely still be used.
Each manufacturing process was chosen for this component because it was the easiest, fastest, and cheapest way to do it at high volumes of product.
The bearing has a particular shape to reduce friction inside the bearing.
The component is functional.
This processes were chosen because they were the most cost effective way to make the part.
On a scale from 1-5, 1 being simple like a ball, and 5 being complex like an engine, this component is a 2. This component is more complex than a wheel, but less complex than a watch.