Machining a 50 cent coin
- Basically, I want to shave down the diameter of a Kennedy half, and
make a shell out of another, so that the former fits into the latter.
The reduced diameter coin needs to be made out of two coins to be thin
enough to fit, undetected, in the shell coin.
So, how do I go about it? I think I'll need to make a couple of pot
collets. Are there blank collets for a taig that can do this?
- On machining coins.....
I have modified two Schaublin ( Swiss) six jaw scroll chucks ( internal and external)
to fit my Sherline lathe.
I have made double faced coins from nickels and dimes...
But, I do not face them in half thickness wise.
I bore out one coin halfway, and insert the second coin ( head or tail)...
Press fit and blend and buff the joint, which becomes invisible....
No heat, no glue , no sweat soldering, etc....
Won a few beers with them....
Jerry G (Glickstein)
----- Original Message -----
From: Tony Jeffree
Sent: Tuesday, January 08, 2008 2:46 AM
Subject: Re: [taigtools] Re: Machining a 50 cent coin...UPDATE
At 07:03 08/01/2008, you wrote:
>Using the superglue chuck, I shaved down a 50 cent piece, and an
>English penny. Then I superglued the two together, and did a tiny bit
>of sanding. Now, JFK and Elizabeth are one. I can't believe how well
>the superglue chuck works. Either side is completely genuine looking.
>Thanks for the idea... I'll be using it in the future.
This is of course just a modern take on the clockmaker's shellac or
wax chucks. The only thing to watch is that heating of the workpiece
during machining can soften the superglue, so you have to take light
cuts or use coolant. I use similar techniques on the mill - superglue
or double sided tape to hold parts down onto a sacrificial board -
and that works well too as long as you don't exceed the limitations
of the glue.
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