Bending Issues and Countermeasures Part 1: Preventing Cracks During Bending

Cracks during bending tend to occur at the ends. This is often caused by surface roughness  the rougher the surface, the higher the risk of cracking. This situation is typically seen when bending on the burr side.
Therefore, as illustrated in [ Figure 2:a] , bending with the sheared (burr) side facing outward is effective. In products that require bending in both upward and downward directions, placing the burr on the outside for either direction helps eliminate burr-related cracks.
In such cases, as shown in[ Figure 2:b] , notching or similar treatments on the outer burr side can help ensure that the sheared surface is positioned on the outer bending side. This technique is especially useful when bending thin wooden boards or panels.