Regrinding Tweezers

Just like our screwdrivers, our tweezers wear with use and need an occasional "tune up".

Here's a "before picture" showing typical problems:

Start by re-working the flats:

For this task I use a thin ceramic whetstone, and water for lubricant. I'm sure that a thin hard Arkansas slip or carborundum slip would work as well.

The main key is that you need a good flat working surface. A slip or stone with a dished out surface is going to cause more problems than it solves.

Using just enough pressure to flatten the tweezer's natural curve against the stone the tweezers are worked back and forth until the inner surface is a uniform matte appearance.

Tuning the edges.

 

I find it easiest to grind the edges of the together as one. In order to do this without putting too much pressure on the tips I place a penny between the blades as shown on the left. Adjust the position of the penney until the tips just meet.

Now using the same sort of back and forth motion, along with slowly rocking the whole assembly from side to side, rework the edges of the tweezers.

 

Here is the end result. The sharper edges and uniform matte grind on the face mean that parts can be held with much less force.

One last detail:

It is important that the tips meet first as shown below. It's not uncommon to find tips that have been bent back slightly so that the first point of contact is a millimeter or so back from the tip. That makes for a perfect watchscrew slingshot. When this happens to me I bend the tips back by laying them on a soft surface, such as a pad of paper, and pressing down just behind the tip with a dowel (photo needed).