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. NX18.104.22.168
Impossible for this version NX?
I built a Integrex simkit on NX 22.214.171.124 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.