kerfing

Kerfing is a woodworking technique that involves cutting a series of closely spaced grooves or slots into a piece of material, typically wood, to allow it to be bent. These cuts, known as kerfs, are usually made through a portion of the material's thickness, leaving a solid section at the back that acts as a hinge. The depth and spacing of the kerfs are critical; deeper and more numerous kerfs allow for tighter bends.

The purpose of kerfing is to achieve curves in wood that would otherwise be impossible to create without specialized tools or techniques like steam bending or laminating. It's a practical and often simpler alternative for creating curved shapes in woodworking projects. This method is commonly employed in the construction of musical instruments, particularly the ribs of guitars and violins, where precise curves are essential for sound projection and structural integrity. It is also used in cabinet making for curved panels, decorative elements, and even in more structural applications where a slight bend is needed.

The process of kerfing can be done using various tools, most commonly a table saw or a bandsaw. A jig is often used to ensure consistent depth and spacing of the cuts, which is crucial for a smooth and even bend. While kerfing allows for significant bending, it does weaken the material to some extent. Therefore, the number, depth, and placement of the kerfs must be carefully considered in relation to the required bend radius and the structural demands of the finished piece. Once bent, the kerfed material can be glued and clamped into its new shape, and sometimes a veneer or backing strip is applied over the kerfs to reinforce the joint and provide a smooth exterior surface.