- Thread starter HMB
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brightspark
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jigsaw or slitting discs for aluminium in angle grinder depending on how much u have to do https://www.google.co.uk/#q=slitting discs for aluminium &safe=active
Spark plug
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Circular saw with the appropriate TCT blade. I have cut 30mm aluminium with a good table saw and blade with excellent results.
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I tend to use a jigsaw or bandsaw, not tried a circular saw so can't comment.
AndyStobbs
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I'm so low tech, I use a hacksaw 
graffian
Seer unto the end of his beard
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I have a prehistoric wood-cutting vertical bandsaw that takes 9 foot blades and will rip (I kid you not) through 6mm alloy plate like it was plywood. It will cut 12mm alloy as well , just takes longer
View attachment 42736
I have an old bandsaw, it came with a stack of wood cutting blades. I have cut 2" ali with the wood cutting blades, it's not to fast, but on 5mm it's fast and no different to cutting wood.
Circular saw, get kitted up with PPE, gloves, full sleeves, full face mask if Possible, and of course ear defenders-- So the lot. keep the blade just through the ally and keep the crown guard as low as poss, consider clamping a pressure pad to the fence to keep the shet pushed down on the table, bit candle grease on the blade, and a good push stick or two.
Stan
Stan
Forgot to add, the number of TEETH on the blade, 300mm I would expect 96T+ something with 36 teeth on a 300 is not going to like ally sheet, could be negative rake as well.
Stan
