Hi Phil, don't know if you have tried these end mills, streaker TICN coated from Imco. They cut through aluminum like butter. I can run them at speeds almost as close to that when cutting wood or plastic. They are designed for aluminum or plastic...a bit expensive but worth it. Here is the link.
IMCO Carbide Tool Inc - Product Catalog
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2006 Tripoint SC with 10psi pulley and Aquamist, custom 2.5" free flowexhaust, FF headers, Decat, Ohlin's, track brace, custom carbon bits
1994 Caterham 7, R400 zetec conversion in progress
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