Which method is acceptable for sharpening shear dies?

Hand filing or light grinding is an acceptable method for sharpening shear dies because it allows for precise control over the material removal process. This technique can effectively restore the cutting edge of the die without risking damage that heavier techniques might introduce. Hand filing allows the operator to feel the resistance and ensure that they maintain the correct angle needed for optimal performance.

Light grinding offers a similar advantage, enabling the operator to refine edges while maintaining critical tolerances. Both methods provide a way to maintain the integrity and geometry of the cutting surface, which is crucial for the effective operation of shear dies and helps extend their lifespan.

In contrast, mechanical sharpening may involve more aggressive methods or machines that could alter the die's dimensions or introduce stress, leading to premature failure. The use of power tools can also be too harsh and may not allow for the fine adjustments necessary, resulting in compromised cutting performance. Therefore, choosing hand filing or light grinding ensures that shear dies can be sharpened with minimal impact on their functionality and durability.