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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Reshaping aluminium cans
For old electronic equipment it is a common thing to do is restuff the outer
can of failed dual electrolytic capoacitors , like these in form http://jensencapacitors.com/public/b...t6elytdual.jpg (3 terminals because 2 are commoned usually) about .5mm thick 45mm long 35mm diameter or so. The original has 2 capacitors built concentric to one another, inside. Fortunately modern ones , singley, for the same rating are smaller in volume, but as separate , to get enough space you have to oval out the can a bit to fit 2 in side by side. How to oval out the closed end without deforming to flats/overhangs. I do not know if the original is spun or annealed&pressed. I seem to remember that to anneal aluminium its a matter of coating with soap and heating till it goes brown, but what to do next to loose metal and before or after sqashing to oval. I fix a tight steel band (a standard capacitor clip) about 5mm from the closed end before squashing in a vice to minimise the flats, but I would like to find a better way. It would be nice to dome the flat top or create a saddle of 2 small domes to the top would loose metal and look ok but how to do with minimal equipment. |
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