Ball bearing



a bearing consisting of a number of hard balls running in grooves in the surfaces of two concentric rings, one of which is mounted on a rotating or oscillating shaft or the like.
any of the balls so used.
Historical Examples

So that they cannot be injured by waste oil from the ball bearing, or by water or snow.
The Traveling Engineers’ Association Anonymous

The man spun around as if mounted on a ball bearing and pulled by strings.
Pursuit Lester del Rey

The same principle has been applied to mechanics in the ball bearing.
Farm Engines and How to Run Them James H. Stephenson

The work, which is the cone for a ball bearing, is shown at a by the dotted lines and also by the detail view to the right.
Turning and Boring Franklin D. Jones

When you get into the movement of a ball bearing disk, your body is free to move.
Warren Commission (5 of 26): Hearings Vol. V (of 15) The President’s Commission on the Assassination of President Kennedy

A pilot box-tool for finishing another type of ball bearing cone is shown at B.
Turning and Boring Franklin D. Jones

It is a board that is on a pivot, a ball bearing, and it has a tendency to give you certain exercises in twisting your body.
Warren Commission (5 of 26): Hearings Vol. V (of 15) The President’s Commission on the Assassination of President Kennedy

Oil the sweeper regularly about once a month by putting one drop of oil on the ball bearing on the hub of each wheel.
Mechanical Devices in the Home Edith Louise Allen

noun
a bearing consisting of a number of hard steel balls rolling between a metal sleeve fitted over the rotating shaft and an outer sleeve held in the bearing housing, so reducing friction between moving parts while providing support for the shaft
a metal ball, esp one used in such a bearing
ball bearing

A ring-shaped track containing hard metal balls that roll freely, used to reduce friction where a rotating element (such as an axle) is attached to a fixed point.

A hard ball used in such a track.

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