How how long does it take to sharpen?
It all depends on the condition of your blade. The easiest is to work for 2 minutes then test the edge. If it feels sharp, stop, otherwise you’re just removing more precious blade material for no benefit. We recommend cutting some food, particularly tomato, as a good real-world test. Do not use finger feel unless experienced! If edge isn’t sharp, continue the process and test every few minutes. If the fine stone really isn’t working, switch to the coarse stone to create new secondary bevels, repeating sharpening process until edge feels sharp, then switch back to the fine stone to finish off the tiny primary bevel.
Do I need both the fine and coarse stone?
It really depends on the quality and sharpness of your knife blades. The coarse stone is perfect for repairing and reshaping worn knives of any type, and the fine stone is ideal for maintaining any blade already in perfect condition. Essentially, once your knives are back to good condition, the fine stone keeps them that way.
I'm struggling to get sharp edges on my paring knives and narrow blade knives.
Narrow blades are usually thicker at the cutting edge (otherwise too weak), and have far wider angle bevels than broad blades. It doesn't look like it to the untrained eye, but for those reasons they actually take more work per inch than most other knives! It's likely not enough metal has been removed to create a new edge, and the old worn edge is still present.
How is this better than sharpening with a honing steel?
A fine water stone with perfect angle control is far better for maintenance with minimal metal removal and no round edges.
People may still think that is the best way because that's what the chef or butcher told them. Problem is, the chef or butcher don't explain how quickly the Steel stops working, and how often they need to restore their bevels. The old cycle. We're breaking it with simple water stones and angle control.
Does the InversionEdge work with other types of whetstones?
The system is designed to fit Naniwa combination stones, which are 2cm thick. The clips are tight though can be manipulated a little if need be, so wil fit many stones.
What are the angles of the sharpening system, and what if I want other angles?
The ‘lower’ end of the tray (visibly less angled) has a platform at 23°, and this generates 16° and 26° edges with the Love Handle on low and high orientations, respectively. The ‘higher’ end of the tray has a platform at 28° (visibly more angled) generates 21° and 31° edges. The Naniwa stone is mounted in the Love Handle with the 3000 grit on the low side, and 8000 grit on the high side (because you want to rough out the big secondary bevel with the coarse stone, and finish the final primary cutting bevel with the wider of the two angles). If you want other angles, you can raise the stone to greater angles by placing spacers of any kind (such as cutting boards or similar) between the tray and Love Handle.
Will the stones wear out over time?
Naniwa stones are the hardest Japanese water stones available and extremely durable. It will take a lot of use to wear these stones down, though like all stones, if they become too dipped anywhere, they can be easily flattened again. The love handle can be widened or narrowed (with a bit of force) to fit.
The Naniwa combination stones will be available to purchase through our online store in the future.
The handle is scratching my tray!
This system is designed to be a working tool, however if you want to protect your tray to avoid scratching, you can place some paper/fabric/tape underneath the handle.
I'm struggling to get my whole knife blade above the tray edge.
Long and very curved blades will sometimes need the handle off the side of a bench to fit (it will hit the benchtop). Japanese pro sharpeners on water stones rarely attempt to sharpen the whole length of a blade in one swipe, but work on smaller sections. If the blade is too long to make a whole sweep, work in sections - the Japanese are the real masters! Both methods work, but for larger, curved knives, you may be beneficial to work in smaller sections.
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