Aviation Snips or sheet metal shears are very good for cutting sheet metal. LOL! After all that what they are made for. The problem is that there are three to a set. One for cutting straight cuts,one for making cuts to the left and one for cuts to the right. The ones I bought some years ago if I remember correctly were close to twenty dollars each but well worth the cost for me.. As far as Dremels. great tools,I've burned out three of them so far.LOL!.What is the best dremel attachment for cutting sheet metal?
There isn't one - not the best use for a Dremel - get a nibbler or the pair of pliers that cut a narrow slot with one jaw going between two others. Tin snips or aviation snips are great - for flat sheet metal - but they bend the metal and using them on a shaped case is a real hassle.
most cases are thin pressed steel - if you want a quick neat job, take the case (marked up with the hole you want) to a car repair shop, and ask them to use what in UK we call a ';nibbler'; to do a nice clean job, and then deburr it to be sure. Keep any steel swarf a million miles away from your mobo. (see links below)
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