How to make a two-headed penny?

[adamforum]

I want to machine a two-headed penny. I read that you want to do it on the seam within a face rather than split it down the side. I tried to SuperGlue the penny to a round bar so I could turn it but the glue would not hold. Surface was flat and clean, etc. Has anyone done this?

[adam.bonhamcarter]

Have you thought about grinding

[xmundt]

Greetings and Salutations...

Here is what I would suggest doing.
1) take a penny and clamp it, face first, in a chuck, centering it as perfectly as possible.
2) carefully turn away half the depth of the coin, starting JUST inside the rim. Light cuts
are best, of course.
3) measure the diameter of the opening you have produced.
4) Clamp a second penny, face first, into the chuck, centering it as perfectly as possible.
5) Remove half the thickness of the coin, to the SAME diameter as measured in step 3.
6) Chuck a short bar of 5/8 diameter metal (aluminum, bronze, steel) into the chuck, flatten the end, and, turn it to the diameter measured in step 3 minus 0.001 or so, leaving a tenon about 1/8" long, and the appropriate diameter to be a tight fit in the recess you created in the above coin..
7) put a TINY dab of epoxy (or, MAYBE) super glue on the end of the bar, and, press one of the hollowed coins onto it.
8 ) after the glue has set, carefully turn away the edge of the coin. The diameter should be an interference fit with the diameter of the hole turned in the other coin.
9) pop the remaining bit of the coin off the tenon, and remove any glue.
10) You should be able to snap the two coin bits together, and, if done accurately enough, the seam at the edge should be nearly invisible. Also, you should not need any adhesive to hold them together.

older, solid copper pennies work better than the fake coins we have now for this.
regards
dave mundt