A grating is any regularly spaced collection of essentially identical, parallel, elongated elements.
An axle or axletree is a central shaft for a rotating wheel or gear. On wheeled vehicles, the axle may be fixed to the wheels, rotating with them, or fixed to the vehicle, with the wheels rotating around the axle.
Bearing housings are modular assemblies designed to make it easy to install bearings and shafts, while protecting bearings, extending their operating life and simplifying maintenance.
Buckets in mechanical engineering can have a distinct quality from the traditional bucket (pail) whose purpose is to contain things.
A gear is a rotating circular machine part having cut teeth.Geared devices can change the speed, torque, and direction of a power source.
A pulley is a wheel on an axle or shaft that is designed to support movement and change of direction of a taut cable or belt.
A shaft is a rotating machine element, usually circular in cross section, which is used to transmit power from one part to another, or from a machine which produces power to a machine which absorbs power.
In its primitive form, a wheel is a circular block of a hard and durable material at whose center has been bored a hole through which is placed an axle bearing.
A shell is a type of structural element which is characterized by its geometry, being a three-dimensional solid whose thickness is very small when compared with other dimensions.