FAQ. Why the angle changes when I flip the blade on Hapstone R2? The angle difference is typical for all clamp-based sharpeners. But being typical does not mean you should ignore it. It's good to know what causes it and try to reasonably mitigate it. The angle difference for a clamped knife can be caused by: the sharpener improper clamping inconsistent factory grind undersharpening of one side Don’t make assumptions. Check it! Don’t “live with that”. You can make almost zero angle difference if you want. The sharpener check procedure It is very important to follow instructions accurately. Set all your...

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...