The Evolution of Hard Turning a P/M Differential Gear Ring

When performing a hard turning operation, many factors come into play in order to produce a quality part. Questions on tool geometry, tool material, tool coating, machine horsepower, spindle tooling, rigidity, coolant usage, spindle speeds and tool feeds, heat dissipation and gaging equipment, are all unknown factors in a first attempt at hard turning. How we dealt with these factors is the content of this paper.