calculation mills and grinders pdf. Gorilla Mill - CGC Tool. Gorilla Mill Phenom. Based on the original 5 flute Gorilla Mill, the "Phenom" for high temp alloys features geometric enhancements that make it uniquely suited for difficult to machine materials including: inconel, waspaloy, hastelloy, rene, stellite, 17-4 SS, 15-5 SS, 13-8 SS and ...