Even a tiny sliver of steel, iron, or other metal will leave an ugly stain if allowed to sit for long on top of a piece of unfinished wood.
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Even a tiny sliver of steel, iron, or other metal will leave an ugly stain if allowed to sit for long on top of a piece of unfinished wood. And metal shavings hidden in your sawdust can do serious damage if they get pulled into your dust-collection system and strike the impeller blades. To prevent these problems, put a shallow pan under your workpiece anytime you drill into metal. In the middle of the pan, support the workpiece with a backer block the same height as the edge of the pan.
—Joe Seibert, Bryan, Ohio