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I work at a plastic manufacturing shop with cnc and mill tooling. Is there a reason that you need to use aluminum? Could you use other materials?? Maybe I can help if so. I have access to very stable and high temp plastics...
I have a tabletop CNC router -- aluminum is about the toughest stuff it can cut, and even that is at 1/10 of a mm per layer running about 100 mm/minute. Even that excruciatingly slow cut rate is sort of at the edge of my machine's abilities. Doing it with steel would be far superior, I just don't have the equipment. I might be able to use brass -- haven't tried that yet but I'd want to check if it has better hardness before I bother.
That said, the only part that has been an issue in aluminum is the base plate on which I stack the cup grate and the compound grate. I'm not sure how long it's going to last (or maybe I'm using too much pressure -- 60 ft pounds when compressing the compound). It was originally flat, now it is dimpled:
For the priming compound grate, the aluminum works fine but it isn't subjected to any force, just scraping. The first test I used a plastic strip cut from a yogurt cup to do the squeegee process. Last time I used a single edge razor but I think I'll go to an art store and get a small plastic oil painting knife for the next try.