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.
The Functional Differences Between Inclined-track Numerical Control and Ordinary Numerical Control
The core differences between the inclined-track CNC lathe and the ordinary CNC lathe (with a flat bed) lie in aspects such as structural design, processing