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Sorry, I put that in inches instead of mm. .005" comes out to .127mm. That would come out to about 16 passes to carve down 2mm.
If you search the forums for aluminum, you will be able to find some good threads showing the various feeds/speeds and projects that have been done. @CharleyThomas makes some great touch plates out of aluminum, he would be a good person to get in touch with about aluminum speeds and finish quality and such.