(Note: these are instructions for sharpening tweezers that you buy at the drug store to use on your body. Tweezers for model making and detail work often require a different, sharper, more narrow point than this method will provide).
Step 1: Materials
- dull tweezers
- rough grit sandpaper (150 grit)
- fine sandpaper (400 and/or 800 grit)
- a flat thin piece of metal or glass
- a small amount of water
Step 2: Prepaire the sharpener
Typically glass covered in sandpaper is used to put an edge on a metal surface because glass is typically very smooth and very flat. I used a very thin piece of aluminum sheet here because it is almost as flat and smooth as glass, and it's thinner than the glass I had lying around.
You want to choose something thin to brace your sandpaper with because that will allow you to have the tweezers in the correct position while your sharpening them.
Step 3: Sand with the rough grit paper
If your tweezers aren't in too bad a condition you can skip this step and move right on to the fine sharpening.
Step 4: Fine sanding and sharpening
Soak your fine sandpaper in some water and then wrap it around your backer material just like you did with the rougher grit paper. Again, "grab" the sandpaper with the tweezers and apply pressure. Now just like you did with the rough grit, move the tweezers in an up and down motion on the sandpaper.
You are trying to flatten the very edge of the tip of the tweezer, so try to apply pressure right down to that last millimeter of the tweezer.
You will quickly work up a slurry - a mixture of metal and water, this will help in the sharpening process so don't wash it away.
Make a few more passes with the tweezers once you get a little slurry and you've probably sharpened it enough.
Step 5: Sand the end of the tweezer
Squeeze the two tips together and alight them on the fine sandpaper so that the angle that is on the tweezer meets the sandpaper over the entire length of the tip.
(Basically pretend that you are standing the tweezer flat on its edge on top of the sandpaper.)
Then, carefully drag the tweezer across the sandpaper maintaining that same angle.
A few strokes back and forth is all you will you need unless the tips of the tweezers are really bad.
Step 6: Revel in the sharpness
Test it out by pulling on something and see if its any better.
If it's not to your liking, just go back and do some fine tuning on the fine sandpaper.