To All:
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).
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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.
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