Depends. Are you talking sheet metal, or machining blocks? If sheets, you can use dremel, hacksaw, or jigsaw (use duct tape to protect the surface from scratching if using a jigsaw).
I would say a jig saw with a really fine tooth metal cutting blade for the average joe person wanting to cut alum. Take your time and use the finest tooth metal blade you can get which is a 24tpi if im not mistaken so that the cut is nice and clean and not ragged. Granted its nothing a file and sandpaper cant fix but using a blade that cuts slower means it will be harder to mess up.
Yea cutting aluminum for most of us is best done with a jigsaw and then filed to the shape you desire, and finally sanding it with fine sandpaper to get it to a nice finished look. Then finally polishing it to whatever sheen you are looking for. The best way to cut a sheet into a chassis would be with a milling machine. It can be very cool if you just have a friend who has a mill that can do your work for you just by exchanging a few beers for the job.
I have never made a chassis myself, but if I were going to attempt making one I would do a nice drawing of the layout, and then trasnfer the drawing to your aluminum sheet. Next I would drill pilot holes wherever needed to make cutting as easy as possible. Finally cutting out your design with either a jigsaw, or if you can find a good blade that would cut aluminum in a scrollsaw that would be the cat's meow because of the great versitility that a scrollsaw provides. Good luck with your project and please come back and share your results with us.
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Last edited by JERRY2KONE; 10.29.2011 at 08:28 AM.
Reason: SPELLING
I wouldn't buy a power tool for a single chassis. I've found that with a little patience, hand saws produce a very good result. A hack saw can make a very straight cut if you follow a straight line with the saw at a long angle - the blade itself keeps you cutting straight. A finer-blade saw can make nice round cuts:
I don't think he was suggesting 'buy a power tool' just if he had one available. Even a 4" grinder with 1mm blade could could do the same thing (plate might get hot though) but doing rough cuts can speed things up sometimes.