The eccentric shaft is an important part of the fully variable valve control. The valve lift changes continuously from maximum to practically zero by rotating pivoting the eccentric shaft. It can be defined in the other way as, if a cylindrical work piece has two separate axis of rotation, one being out of center at the other, the work piece is termed as eccentric and turning of different exteriors of the work piece is known as “Eccentric Turning”.
According to the eccentricity required by the work piece, turning an eccentric shaft or eccentric sleeve in advance, then mount the work piece on the eccentric sleeve or eccentric shaft, following with fitting them together on the chuck to execute CNC turning. This solution is appropriate for short eccentric shaft.