Watch Solutions For Hard Milling This MMS inMotion presentation from Makino demonstrates the latest techniques and technologies for high-speed machining of hardened materials for die or mold applications. Check out tips, tricks, and new technologies you can use to mill the toughest steels, shortening your lead times, lowering your costs, and eliminating bench work.
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Now we are going to talk about spindle speeds and some of the considerations that go along with the different types of materials. I basically just kind of broke this down on material (see chart in presentation). Not to say that every tool can be ran at these rpm's, but this is at least a guideline to help get you started. Again I would refer back to manufacturer spec as well as refer to the length of the tool or the diameter of the tool and make sure that it seems within reason. In the 60 Rockwell material range we are saying that we are going to be anywhere from 200 to 400 surface foot. Based on that I can take that information and throw that into my calculation for rpm and figure out what my rpm should be (see calculation in presentation).