I missed this when it first came out, but here is a way to hard-turn bearing & seal OD's and the like. Here are some excerpts from an article in MMSonline (short video at site).
=========================================================Hard turning can reduce, and in some cases eliminate, finish grinding operations. Because it is a single-point turning process, however, it will produce feed marks on a part?s surface no matter how much the feed rate is reduced.
Sumitomo Electric (Mount Prospect, Illinois) has developed a "lead-free" tooling system...
The keys to this lead-free turning process are tool design and feed direction. Single point turning feeds a cutting point along the lathe?s Z axis?longitudinally down the rotating part. Conversely, lead-free turning moves a wide, blade-like insert tangentially across the part in the X axis. A dedicated toolholder provides the proper lead angle for the insert as it traverses across the workpiece. =========================================================