A spindle or axle of a wheel.
A stimulus or driving force.
A bar or beam of wood or iron, connecting the opposite wheels of a carriage, on the ends of which the wheels revolve.
A round object used as an aid for shaping a material, e.g. shaping or enlarging a ring, or bending or enlarging a pipe without creasing or kinking it.
A tool or component of a tool that guides, grips or clamps something, such as a workpiece to be machined, a machining tool or a part while it is moved.