{{Techniques infobox
|image           = 
|designers       = [[User:Tim|Timothy Schmidt]]
|date            = 2013
|vitamins        = 
|materials       = 
|transformations = 
|lifecycles      = 
|parts           = [[Frames]], [[Plates]], [[Bolts]], [[Nuts]], [[Ball hitches]]
|techniques      = 
|tools           = [[Wrenches]]
|git             = 
|files           = 
|suppliers       = 
|reversible      = true
}}

[[Category:Techniques]]

=Introduction=
In an automobile, ball joints are spherical bearings that connect the control arms to the steering knuckles, and are used on virtually every automobile made. They bionically resemble the ball-and-socket joints found in most tetrapod animals.

A ball joint consists of a bearing stud and socket enclosed in a casing; all these parts are made of steel. The bearing stud is tapered and threaded, and fits into a tapered hole in the steering knuckle. A protective encasing prevents dirt from getting into the joint assembly. Usually, this is a rubber-like boot that allows movement and expansion of lubricant. Motion-control ball joints tend to be retained with an internal spring, which helps to prevent vibration problems in the linkage. 

=Challenges=

=Approaches=
  * [[https://www.westerntowing.co.uk/product/alko-pressed-steel-coupling-to-fit-40mm-wide-box/#|Alko pressed steel trailer coupling for 40mm frames]]

=References=
  * [[https://en.wikipedia.org/wiki/Ball_joint|Wikipedia: Ball joint]]