It mainly consists of three parts: Steel ball, screw body and tool interface. The body has external thread; The ball is embedded in one end of the body, and the tool interface is at the other end of the body
The steel ball was cut to a plane, the steel ball can rotate relatively against the screw body to avoid the rotation between the ball and the compression plane which may damage the plane.
When the screw body is not perpendicular to the plane, the steel ball can adjust its angle adaptively to make the ball plane compress the work piece tightly.
Using the normal compression screw can only make compression node-to-surface, easy to damage the compression plane.