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Bending a sharp corner in metals
Andy asked about bending some silver into a sharp corner to fit a lute, I am not sure I can visualise what the job is, but in the trade when we make boxes that require sharp 90 degree corners we always score the inside of the bend. This can be done with a graver, a file or what we call scorers, these are a cutting tool that can score a groove when pulled along a deep scribed line in metal. Once you have scored a line the metal will bend easier at this point and create a sharp corner. The score line does not have to be deep, although when bending thick metals a decent depth of score line will be needed, but for Andy's 0.75mm. fine silver a slight line will do. But I would advise experimenting with some same thickness copper sheet before doing it on the silver.
Here are some photos of one of my scorers, I have a few, each with a different cutting angle as different angles are needed when scoring for multi sided shapes, I made some of my scorers by bending and grinding the tangs on old files, this is one of them.
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James