Seems to me you can use Lathe.
By definition, the Z axis is usually the chuck axis on a lathe, or the spindle on a mill.
It does not matter if the chuck is on the left, right, up or down.
What does matter is the movement is appropriate for the part.
Don't quote me on this, I am NOT a lathe programmer.
P.S. to Rally,
Our purpose here is to help MasterCam programmers, not enforce piracy laws.
ObrienDave. MasterCam since V6. Gcode since 1983.
The nose you punch today may belong to the butt you have to kiss tomorrow.