It is often a desperate move scratch at something with your keys. At best you will tear up whatever you are trying to cut or pry, at worst you will break your key and be stranded. I've tried to make a keychain tool that could replace a small pocket knife or utility knife -- so I would think 'where are my keys?' instead of 'where are the scissors?'
The first half shows how to make a simple saw keychain. In the second half I do some more detailed grinding to make a knife-like tool that fits well in my finger tips.
Some key points:
- Sawzall blades are very tough metal
- Drilled hole with dremel grinder
- Shaped and cut with bench grinder
Here is a video of the final tool:
Step 2: Mark hole and length
I used an old screwdriver to make scratches to mark the length and hole.
Step 3: Start hole with center punch
Step 4: Make a hole
I tried a regular drill bit with poor results.
A blue grinder from a dremel kit worked well, the bit was nearly destroyed.
I made a jig by putting nails into a board very close the blade.
Step 5: Is the hole big enough?
The hole here is a little too small to fit over both rings of the keychain. Measuring the keychain, the hole needs to be almost 0.2"
Step 6: Grind to a shape
Removing several teeth makes the saw easier to hold.