This oversize sanding block flattens glued-up cutting boards. The weight of the sanding block provides the appropriate amount of pressure without requiring a lot of elbow grease.
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Drawing of two fisted sanding block on cutting boards

Flattening glued-up cutting boards always proves challenging. The end grain tears out when run through the planer. Power sanders don't quite cut it to get a flat, even surface.

This oversize sanding block does the trick. I made it by laminating two layers of 3/4" plywood. The overall size is a few inches larger than the cutting board. Handles made from wood closet rod get screwed to recesses in each end. 

With self-adhesive sandpaper attached to the bottom, flattening a cutting board becomes an easy task. The weight of the sanding block provides the appropriate amount of pressure without requiring a lot of elbow grease.

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