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Jig saws are not made to cut through aluiminum espescially that size. That is really thick and it sounds like you have worn out the motor trying to cut it. If the saws are hot. Let them cool down then proceed but like I metioned before you are putting a lot of stress on something not made to cut aluminum even with a metal cutting blade
High Speed Steel - Used for wood and light metal cutting
Bi-Metal - Also used for wood and light metal cutting.
Cobalt Steel - Tougher and lasts longer than Speed steel and Bi-Metal. Used for wood and metal.
Carbide Grit - Strictly used to cut masonry board.
Scrolling - Thinner than the regular jig saw blades and are used for tight turning cuts.