Which grinding wheel condition is preferred to avoid overheating during operations?

A well-dressed wheel is preferred to avoid overheating during grinding operations because it ensures that the grinding wheel has a proper surface condition that allows for effective material removal. Dressing the wheel exposes fresh, sharp abrasive grains that cut efficiently through the material being ground. This efficient cutting action minimizes friction and heat generation, which are the primary causes of overheating.

A well-dressed wheel maintains an optimal cutting ability, which helps in dissipating heat generated during grinding, reducing the risk of thermal damage to both the workpiece and the wheel itself. Using a wheel in good condition also promotes consistent surface finish and dimensional accuracy.

In contrast, other conditions like a loose bond may cause the abrasive grains to wear prematurely or become dislodged, which could lead to ineffective grinding and increased heat. A hard wheel could be less effective in cutting soft materials and might create more friction, leading to overheating. A soft wheel, while it might cut quickly initially, can glaze over, making it less effective over time and potentially leading to overheating as well. Thus, the condition of being well-dressed plays a crucial role in maintaining an efficient grinding process.