hooty,
Couple of items first....I hope you've posted this question on the 1) Autodesk HSM Post Processor forum, and 2) at the Fusion 360 Manufacture forum. I'm thinking you are more likely to find a larger audience there.
I don't have Okuma mills, but maintain posts for our three Okuma 'mill-turns' ('95 Dual spindle, live tool, c-axis interpolation; '98 single spindle, live tool, c-axis interp. and '08 Okuma SpaceTurn dual spindle, live tool, c-axis interp.). The first time I posted code with the only Okuma Mill-Turn post available from the Autodesk library, all three machines choked on the code. Older machines are a nightmare for multiple reasons. The worst is that Okuma constantly updated the firmware in their controllers, so even the programming manuals delivered with the machines wouldn't necessarily allow one to write code immediately as they were effectively out of date. However, I suspect this is less true of Okuma's mills.
If you are lucky, forum inquiries will turn up a post that will be pretty close to what you need. If not, then I would proceed as follows: find a part that was made in the past on one of these machines; something with drilling, tapping, pocketing, profiling, etc. Then get hold of the program used to make it. Now model the same part in Fusion and CAM the same operations. Post the Fusion CAM with the generic post and see where the differences/problems are.
You may find that some of the problems can be solved using the posting options; for instance, the control doesn't want to see line numbers - then turn them off in the post options and so on. You can also dry run the Fusion code and see where the control has problems. You can then post some of the problems to the forums mentioned above and see if anyone can help.
Finally, if you're willing, Autodesk has a free 'Extension' for the Microsoft Visual Studio Code editor that allows one to make changes to a post and see the resulting code immediately. It's very handy for simple edits where lines of code only need to be reformatted to work properly. However, you can also make very sophisticated edits of the post to take care of more complex operations.
I've avoided making any mention of third parties that modify or create posts for a fee as I'm guessing you're not into wanting to invest in those sorts of options.
Fred
