Thanx for all the replies. Someone requested a summary so here it is. They're all pretty much the same though.
T
Definition #1 (My favorite):
It is a buzzword (created by someone apparently unfamiliar with the shape of
a prism) applied to milling simple parts with only vertical and horizontal
surfaces.
Definition #2:
I always thought it to be flat or normal surface machining... Face milling,
profiling, pocketing and the like. Drilling, counterboring, boring and
tapping would be included. Multi-side machining (as in tilting rotary table
indexing) would be included provided it is positioning only, not
interpolated. Essentially anything that does not involve 4 or more axis
interpolation... No fancy surfacing like in die work or impeller/turbine
blade machining.
Definition #3:
Any form of milling where the tool axis remains stationary
during the cut. This is not the same as 2 1/2D machining,
which adds an additional restriction that the cutting plane
be perpendicular to the axis of the tool.
Note that prismatic and 2 1/2D machining are also applicable
to machines with rotary tables and/or heads. In this case,
the rotary axes are oriented during RAPID (G00) motions, and
stay stationary during cutting (G01) motions.
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