Why is my extra-coarse diamond slow? The question seems simple but it's quite complex. Abrasive Cutting Performance The performance of abrasive cutting depends on numerous factors. While many relationships can be explained, not all can. Sometimes, abrasive A has zero cutting performance on steel B, or causes blade chipping, extreme stone dishing, glazing, or balding. Often, these specific incompatibilities can't be explained and must simply be accepted. Grit Value and Cutting Performance Grit value is a major factor affecting cutting performance. Intuitively, one might think "coarser" means "faster" because larger particles remove more metal. However, this isn't true for extra-coarse...