It looks like it's been a while since there was a discussion about cutting aluminum trim. I've attempted to attach a sketch of how I built a sandwich of three $1.50 furring strips to cut four 1/2 inch angles to 1/2 inch by 1/4 inch on the table saw.
I set it up so the furring strips are longer on each end than the stock aluminum that I want to cut, so the blade is 'trained' by the wood before it encounters the aluminum and stays in plane once the stock leaves contact with the blade.
The 'bulkiness' of the set up helps with grip and kick-back avoidance, fingers are never near the blade or the active cut.
Old news? Any contrary advice or warnings?