Gallery, Projects and General > The Design Shop
Expanded coin making
raynerd:
I've always been into magic just for fun, I'm no good but always been impressed by it. One gaff coin I've made on a few occasions is a shell coin. It's just a coin totally 'bored' out so that it sits over another coin. They are very effective, I've a £2 I made that sits above a 10p, 20p, 2p or 1p and you can do some nice tricks with it. I've not tried it yet, but you can also turn down an identical coin I.e bore out a 10p and turn down the rim of a 10p so that the turned down 10p sits inside the shell. As you can imagine. They hold together looking like a complete coin and yet drop out to give the illusion of a new coin appearing.
There is something called the expanded coin shell. This is 10p or £2 that has been hollowed or bored out to create a shell but also "expanded" so it sits over an original matching coin (as apposed to the above, where the coin needs to be turned down). I'm curious to know if anyone has any ideas as to how to go about making one? Magicians say they show signs of stress so they are clearly made from originals. Anyone any thoughts as to a process of making these?
Looking forward to your replies.
chipenter:
It's got to be like a very small english wheel , after it's bored out .
BillTodd:
The press shop guys at work, use a thing like an expanding collet to expand rings. (I'll ask about it when i next see them) .
typically, expanding metal, for curved seems etc. is done by gripping with a split jawed 'vice' with a tapered wedge (*or rocking jaws) that pushes the jaws apart as the gripping force is applied . The motion only moves a few thou" .
I would have thought, that a set of segments making a disc, tapered on the inside at an oblique angle , could be fitted inside the bored coin. If the segmented parts are pressed by another tapered part it would stretch the coin.
* shrinker-stretcher jaws http://www.frost.co.uk/shrinker-stretcher-spare-shriking-jaws.html and taper type https://secure.wf-api.com/www.daggertools.com/3m5/metal-shrinker-extended-reach/shrinker-stretcher-jaws.html
awemawson:
Is "defacing the Coin of the Realm" not still a treasonable crime :scratch:
I don't think we can come and visit you when you're banged up in the White Tower awaiting execution :lol:
(Coinage Act 1971 makes it a criminal offence)
RobWilson:
I just knew that was coming :coffee:
Rob
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