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.
Step 2: Draw the Design
Just draw your throwing star design onto your quarter outline. You can measure and do it properly and you will probably get a better final product, but the coin is small enough to just freehand. Keep in mind when designing that the coin is small and therefore relatively hard to work on so keep most of the cuts relatively large.
Step 3: Cut Out the Template
Cut out your paper design.
Step 4: Transfer Design Onto Quarter
Put your cut out onto the quarter then trace around it in sharpie.
Step 5: Cut Out the Coin
There are lots of ways to do this; with a hacksaw, angle grinder, or bench grinder. I used a bench grinder because it is faster than a hacksaw and I don't own an angle grinder. To make the hole in the middle I used a drill with a metal drilling bit. I found out you can make the coin look pretty cool if you heat it and let it cool until the metal is darkened then sand the surface. This only makes the standing out surface silver while leaving the background black so the face on the coin stands out.
Step 6: Done
This probably isn't going to be the strongest or most durable throwing star, but its fun to play with and doesn't take very long to make. My friend can throw them into wood from more than thirty feet away. Once again BE CAREFUL these are small but could still be dangerous.