Popular Woodworking 2005-10 № 150, страница 26

Tricks of the Trade

continued from page 22

Dry Cooling for Sharpening

In Leonard Lee's "The Complete Guide to Sharpening" (The Taunton Press), he warns against plunging a hot tool into water when sharpening on a bench grinder. This quenching can cause minute fractures in the thin metal at the edge, compromising its sharpness. However, if you don't cool overheated metal, it can turn blue and distempered, losing its ability to hold an edge for even a short time. So what to do?

Oddly enough, the world of computers offers a solution. Many discarded computer circuit boards incorporate a heat sink used to keep the computer chips cool. A heat sink is made of a special alloy and design that dissipates heat very quickly. It's easy to identify because it's usually the biggest component on a circuit board. It generally has a grid of "fingers" on one side, and a flat face on the other. Sometimes a fan is attached to it. In any case, the sink is usually easy to detach by removing a few screws. I mount the heat sink flat-side up next to my grinder. When a tool gets hot from sharpening, I lay it on the sink, and in a few moments it's cool enough to continue to use.

Bob Ward Eugene, Oregon

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