Is your problem simply needing a post for your machine? Are you getting the angles you want, just not the right axis call out? Modding a post is pretty simple. You might even find some sample 4th axis posts in there if you root around in the post samples... But in the short term, edit the "Mazak M2 w/b-axis" post to output "B" instead of "A".... Make sure to add "B" to the modal comand line in the post header or you could use a "replace" call at the end of the post to swap B for A, either will work.