There are problems with carbide cutters and aluminum. Aluminum sticks to carbide and you end up engraving with aluminum not carbide. For routing you cannot get a diamond bit, maybe High Speed Steel would work better, not sure.
Aluminum has a high parting speed, when I do license plates I use 20,000 spindle speed, (max speed on my machine). I also only go about .002 deep so that is useless info for you.
The milling bit suggested is HSS and should work better, just watch out for too high a feed rate.
Philadelphia, PA (Really Bensalem)
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