Outer diameter is 490mm with tolerance +/-0.05,
Inner diameter is 470mm with tolerance +/-0.05,
In order to avoid the ring out-of-round during machining, several fixture gauges were designed. Finally get very good quality finished parts, run-out and concentricity are within 0.05.
Main Causes of Machining Errors
(I) Spindle Rotation Error Spindle rotation error refers to the variation between the actual instantaneous rotation axis of the spindle and its average rotation axis.