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Okuma Multus Post Builder Milling Post. Coordinates transformation


Hello all!!!


I'm trying to do post for Okuma Multus B200 in NX Post Builder. This is mill-turn machine. As explained in tutorials about mill-turn posts I created two posts - one for lathe and second for milling operations.

With building lathe post i dont have serious problems yet but with milling part I got it.


I have one BIG quesion.


I need to mill pocket which has an angle with, for example X axis. On Multus X axis directed to top and coincides with direction of M-tool spindle (mill spindle), z-axis coinsides with lathe spindle, and y axis is perpendicular to both and directed to CNC operator.


In NX i have created cylynder in machine coordinate system. And created two milling operations. First for milling pocket in z-y plane so that the mill spindle directed by X axis. Second milling operation for creating pocket inclined at an angle in X-Y plane. When I do postprocessing NX give me coordinates and angles of tool tip in machine coordinate system (MCS).


Because in the first case direction of the mill spindle in NX MCS coincides with X direction of M-tool spindle of Multus i don't need to do coordinate transformation. But in second case I need. If, for example, in second case i need pocked inclined at an angle by 30 degrees from vertical X axis I can program in post for output G-code (M110 G138 C30) to rotate workpiece  by 30 degrees so that the pocket normal axis will be coinsided with X axis of okuma in reality. But wich MOM function i must to implement to convert raw output coordinates from NX MCS to Multus MCS i dont know.


Or maybe i need to implement for each mill operation its own MCS in NX and apply some MOM functions in post to go from one coordinate system to other?

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