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Neither motor oil or WD-40 make good cutting fluids, motor oils smoke point is too low and WD doesn't have much in it for lubrication at all. Mineral spirits is a better cutting fluid for aluminum than either of those. On a band saw we use a wax stick product and apply it to the blade periodically, much less messy than liquids.
OP can get by just fine on a band saw with a HSS blade, use at least a 12 TPI for 1/4" unless you have a lot of cuts to make - go with a bi-metal blade in that case. The width of the blade should be determined by how tight any contours are. You can get by with a wider blade if you can segment the contours into shorter straight cuts.
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Even a cheap High Speed Steel blade will be fine if it has the correct teeth per inch for the material your are cutting. Also use some type of cutting fluid. used motor oil will work for aluminum if that's all you have, it just makes a mess. Just use a small brush and to apply it.
Way to heavy for aluminum.
There are plenty of water based lubes available.
Biggest problem become drying up the cutting hardware.
WD-40 is your friend.
Neither motor oil or WD-40 make good cutting fluids, motor oils smoke point is too low and WD doesn't have much in it for lubrication at all. Mineral spirits is a better cutting fluid for aluminum than either of those. On a band saw we use a wax stick product and apply it to the blade periodically, much less messy than liquids.
OP can get by just fine on a band saw with a HSS blade, use at least a 12 TPI for 1/4" unless you have a lot of cuts to make - go with a bi-metal blade in that case. The width of the blade should be determined by how tight any contours are. You can get by with a wider blade if you can segment the contours into shorter straight cuts.
The solvent in WD-40 is what you are taking advantage of.
For the most part NO LUBRICANT is needed so almost anything light weight works adequately.
Buy a quart of concentrate and mix it up with water.
I do this often enough I have a number of smaller submersion pumps to place in a 5 gallon bucket
and have someone direct a thin stream right at the cutting point.
Generally do it outside and rarely bother collecting the cutting fluid.
Just us it 'one shot.'
I did it on a sliding table stone saw using a carbide blade once.
Larger saw designed to cut large format granite tiles.
Smaller diameter carbide blade, plenty of water based cut lube.
Wear a rain poncho.
The stuff will get everywhere.
I even used a full face mask it was spraying around so much.