[asid61]

We use a metal cutting chop saw; a Dewalt. We cut aluminum extrusions including 2x1 and bosch without problem. It has a clamp onboard, so the material does not lift or move around.
We had a problem this year with a terrible cut (nobody got hurt or was in danger) when somebody tried to cut 1/8" aluminum at an angle. Bad idea, and the piece had to be scrapped. We use a bandsaw for plate now.
The clamp is hard to get square and the saw is extremely loud, but in my two years on the team nobody has gotten hurt or even come close. Clamping correctly makes things much easier.