Sorry.. I remember, for old version NX was impossible 3d material removing for turning (NC Code File Simulation).
I try to simulate simple lathe operations - and no material removing. NX126.96.36.199
Impossible for this version NX?
I built a Integrex simkit on NX 188.8.131.52 and the NC code simulation worked with material removal.
Like @schauerm3 mentioned, have some lack about simulation with milling and turning operations, but worked.
I hope this helps.