12 years ago
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.