If you wanna do Machining a model with the CNC machine than use the software Power mill (By delcam).
Just simply save your model as STEP/IGES and import it to the power mill, Make your tool spec and generate the program for a specific CNC m/c.
Just go through my power mill tutorials..!!
Answered with a tutorial: https://grabcad.com/tutorials/hi-how-can-convert-a-3d-max-file-to-cnc-machine