| 摘要 |
PURPOSE:To obtaine reliable and highly accurte non-true circular shape, by oscillating a work about a sliding shaft as a center while the work is rotated in synchonism with a cam having its outer diameter surface of a shape similar to the non-true circular shape to be processed. CONSTITUTION:A work W carried by a spindle 29 and a core pressing shaft 34, while rotating in synchronism with a cam 20 supported to a cam shaft 17, is oscillated about the axial core of a swingable shaft 12 as a center in accordance with the outer diameter of the cam 20, caused by swingable arms 14, 15 which oscillate due to the change in the distance between the ceters of the cam 20 and a cam follower, thereby the work W is formed in a non-true circular shape by a grinder 38, having a diameter similar to the outer diameter of the cam 20. The oscillation of the work W is made equal to 1/phi of the raise of the cam 20, where phi is the ratio of the distance H between the axial core and the grinding point of the work W and the distance L between the axial core and the center of the cam 20. By changing the value of phi. The accuracy of the non- true circular shape may be freely adjusted. |
