And a right hand equivalent to that CNMG (or so it seems) would be mounted with the tool stock square, thus allowing both turning and facing with the same tool. However, in that orientation, increased depth of cut beyond a bit more than the point radius becomes increasingly difficult due to the negative lead angle. A real machinist doing work for profit would have insert holders to match their needs, never moving a properly squared/oriented tool post from it's proper location. Makes it nice for consistency, and just dropping on a boring bar or parting tool without worry or adjustment. However, being cheap as I am and not earning with my tools, I find I frequently change the tool post angle to extend the tooling I have. So, that same right-hand CNMG holder can be angled to about 1 o-clock providing just a little lead angle, but sacrificing it's usage in that orientation for facing. Some time back I acquired a secondary-point holder to use my otherwise pristine and never used 100* points with a rather hefty lead angle. And with that, I am far more likely to leave my toolpost square. And having so many "free" points, I'm not at all hesitant to feed that thing pretty hard into interrupted cuts, including induction hardened splines on occasion (destroys the insert edge, but can be done).
