With a router there are two ways people recommend cutting aluminum.

1. Fast and multiple passes. You might run at 100+ipm but only take .02"-.05" per pass.

2. Slow and deep. You need a machine with some horsepower to do it, but with a high HP spindle (5hp+), coolant/lubrication, and air you can make some pretty heavy passes. .125" no problem in one pass with 3/16" cutter.

You'll absolutely find pocketing is way easier than cutting. When cutting you need to keep the kerf and area around the cut very clean. It's very easy for aluminum to weld itself on to the bit. If this happens, you will snap a bit. A blast of air is very effective along with a spray every once in a while with WD40