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Hi all, I have done some Inconel in the past(700 series) but don't have a ton of experience with it. I have an upcoming job with some features like small .03" diameter corner reliefs and .05" dia. holes. My question is what is the best coating for Inconel 625? The stock is a 6.5" by 5" by 2" rectangle. I will be machining on a 5th axis into a semi circular cover of sorts. So there will be a lot of surfacing as well as those small features mentioned before. I did some searching online but found mostly Brand specific reccomendations like Helical's Tplus coating I know is good for Inconel but I am buying a custom dovetail tool from harvey and would like to know the best coating they offer specifically.
So, I have never personally worked with this material. But we have cut this in the past using carbide endmills, with low tool life. Judging from the other Inconel I have done, this is somewhat typical. I have heard it three ways: M42 is better, carbide is better, PM is better. What do you guys think? What has worked well for you?