Sharpening a knife with a grinder can potentially ruin the edge if not done correctly. Grinders are powerful tools that can remove metal quickly, and if used improperly, they can damage the blade. Here are a few considerations:
Heat generation: Grinders generate heat, and excessive heat can affect the hardness and tempering of the blade. Overheating the blade can lead to loss of hardness, making it less effective at holding an edge.
Material removal: Grinders can remove metal rapidly, which can result in the removal of too much material, causing the blade to become thinner or altering its shape. This can lead to an uneven or weakened edge.
Incorrect angle: Achieving and maintaining the correct angle while using a grinder can be challenging, especially for beginners. If the angle is inconsistent or incorrect, it can result in an uneven edge or even damage the blade.
Loss of control: Grinders are powerful tools that require skill and control to use effectively. Without proper technique and control, there is a risk of accidentally grinding too much or unevenly, leading to an inferior edge.
For these reasons, using a grinder to sharpen knives is generally not recommended unless you have experience and confidence in your abilities. It's advisable to use more appropriate sharpening methods like sharpening stones, honing rods, or guided sharpening systems, as they offer more control and precision over the sharpening process. If you are uncertain, it's best to seek guidance from a professional knife sharpener.