This is a fun easy project, I made a few of these for a friend of mine who can throw quarters a very long distance. I figured it would be pretty cool if they could stick into something, so took a quarter to my bench grinder. BE CAREFUL this could be dangerous if used by the wrong person.

Step 1: Getting the Coin's Outline

To draw a good throwing star it is a good idea to make a stencil out of paper first. A easy way to transfer the outline of the quarter onto the paper is to place it under the paper, rub you finger in small amount of graphite then rub your finger around the outside of the coin.
Damagin US or Canadian currency is illegal.
Then how do the souvenir penny machines work, they destroy a penny???
The penny machines are legal but you can't pass off that coin for a penny when your are trying to buy something.
not like you are going to buy something with the throwing star..
They have lixenses.
nocker covered this above, but no, it's only illegal if you do it to commit fraud. It's illegal to (however ineffective) take a $1 bill and write on it with a marker to make it look like a $5 bill and spend it, but it's not illegal to just write on a $1 bill. Similarly, it's illegal to take a penny and crush it and paint it to look like a dime and use it as a dime, but crushing a penny isn't by itself illegal.
My friends say damaging Money is illegal or something. (I took the gold out of a Canadian Toonie and made a Keychain)
we all do this even if its illegal. Also, the gold piece in the middle, act as a 1$ in various machine(like arcade, or claw machine)
But the Gold is the size of a penny. Smaller even.
and? I don't know how claw machine coin system work, but try it yourself, it work!
And btw, you can also use the silver of a 2$ in a machine, it act as a 2$. so you can get 3$ out of a 2$. nice uh?
Haha! Awesome! Not quite legal (defacing currency or something), but half the cool stuff in the world isn't.
In the United States, U.S. Code Title 18, Chapter 17, Section 331 prohibits "the mutilation, diminution and falsification of United States coinage." The foregoing statute, however, does not prohibit the mutilation of coins if the mutilated coins are not used fraudulently, i.e., with the intention of creating counterfeit coinage. Mutilation without intent to create false currency, that is, mutilation for this purpose is legal. Also note that while it is no longer illegal in the United Kingdom to mutilate the image of the Queen, it is still illegal in Canada. Yay Wikipedia!
You used your camera to photograph the coin/star but, you couldn't photograph your drill and grinder.....interesting.......
I used the webcam on my computer for the coin pictures but my grinder and drill are out in my workshop haha.

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