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.
Technical drawing: its significance in manufacturing
Technical drawing continues to be an important aspect of the machining industry. It plays a key role in guiding manufacturers to ensure that machined parts