Still, file edges so you don't cut yourself capping them.
Years ago I would likely have used a Porta-band with chopsaw type base for something like this.(know any plumbing/mechanical/HVAC folk?)
Careful if you grind vs cut, aluminum snags discs hard(& brass, copper). You should really have a disc just for aluminum. Many metals should really take their own type of grinding discs. Some discs can even change metallurgy at the cut. Stainless for instance can loose it's stainless properties with a regular old Superbond discs. And beware of the big box fat discs. Buy industrial, wear that shield and be able to yell for help. ....please.
