How should the cutting edge of hot cut chisels be sharpened?

The optimal method for sharpening the cutting edge of hot cut chisels is hand filing. This technique allows for precise control over the angle and shape of the cutting edge, which is crucial because a hot cut chisel needs to maintain a sharp edge for effective cutting of heated metal. Hand filing provides a more refined and accurate sharpening process, which is essential to prevent overheating and damaging the tool.

Using hand tools like files helps to ensure that the integrity of the chisel's material is preserved and that the cutting edge is left with the appropriate finish for optimal performance. Additionally, hand filing facilitates the maintenance of a consistent contour along the edge, improving its performance during use.

Other methods, such as power grinding or water cooling, could potentially alter the heat treatment of the steel or result in an uneven edge, while laser sharpening is generally not practical for this type of tool due to its specialized application and expense. Thus, hand filing remains the preferred and most practical technique for keeping hot cut chisels effective.