I haven't been directly involved in manufacturing/machining operations for some years, I have in the past used an outstanding source for this kind of information. It was known as the Machinability Data Center. It was located in Cincinnati, Ohio. The center published comprehensive handbooks of data on feeds, speeds, and metal removal rates for various processes and materials, as well as machinability data. The center also offered courses and seminars on a variety of related topics.
I recommend you try to contact the center, in whatever form it currently exists.