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| Why is my lid jig a miserable failure? |
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| tekfab:
You could also try annealing it before you start and for safety's sake perhaps during the process. A simple way to anneal is to heat the metal until a piece of softwood such as a match leaves a scorch mark. Mike |
| Fergus OMore:
I would think that you'd be best advised to forget all this mill stuff and go back to basics which is a 'Bob and Aunty' which is a pair of formers which like the couple in question fitted together- with just a little bit of clearance. I'm sorry but that is how old time blacksmiths described it. If you want to do it the way of industry, you could copy the way drinks cans are made- and that is with a slug of aluminium being spun with a former in the middle of it until it forms the base and then continues onto the making the sides! If you want to make it the way that my old firm made 'caps' and 'closures' you have to make up progressive hardened dies and use stamped blanks from sheets. We used to put screw threads on- and never damage the coatings and decoration. Far too involved for a one off? Again, you could do the whole thing with a raising hammer as everyone that has made a model loco boiler does with copper. If you must try some variant of spinning, you will need very hard and very polished tool ends( :hammer:). I'd stick with Bob and Aunty who seemed to produce one item at a time :bang: Regards Norman |
| PekkaNF:
If you have a good shop press, you could make form from steel (simple turning) and do some "Rubber pad forming". http://metalmeet.com/forum/showthread.php?t=3129&page=3 http://content.answcdn.com/main/content/img/McGrawHill/Encyclopedia/images/CE619200FG0020.gif http://www.answers.com/topic/sheet-metal-forming http://en.wikipedia.org/wiki/Rubber_pad_forming http://www.jmpforming.com/applications/aerospace/rubber-pad-forming-for-aerospace-industry.htm Pekka |
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