I'm looking for the best way to make holes, about 7mm, in thin sheet steel - a large can specifically (for a funky lampshade). Drilling them results in a shitload of burrs on the underside of the holes which is a pain to remove. I thought about maybe using an arbor press with a hole punch on the end ? How can I make holes in thin steel without burrs ?
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Some support (that also gets drilled into....don't use your fingers) on the inner surface of the "Can" will prevent the burrs pretty well, probably enough that you will be able to de-burr them with some sand paper.
That's the Enginering theory anyway, but seeing as I'm assuming it's a curved surface, you'll have to be a bit inventive in how you do it.
Edit: My point is.........Rigidity is the key aspect in achieving your very lightly burred hole
They don't grab like a normal bit.
Chips are "Plant-based" no matter how you cook them
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I'm personally responsible for all global warming
https://www.ikea.com/gb/en/p/ordning-kitchen-utensil-rack-stainless-steel-30131716/
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That would be the most efficient method. It will still leave burred edges. (Mostly on the inner surface of the lampshade.)
Tricky. Not even a plasma cutter is likely to manage that.