Why must the bevel be accurate on both pieces of wood being repaired with a scarfed joint?

The accuracy of the bevel on both pieces of wood being repaired with a scarfed joint is crucial because it ensures a tight glue joint. When two pieces of wood are joined using a scarf joint, they need to fit together seamlessly to maximize the surface area for the adhesive and to provide strength in the repair. If the bevels do not match precisely, it can lead to gaps between the pieces. This not only weakens the joint but may also compromise the overall integrity of the repaired structure. A proper fit is essential for effective bonding, allowing the glue to establish strong molecular connections between the wood fibers, which is fundamental for the joint's long-term durability and performance.