Naniwa Gouken Aramusha #220 Coarse Whetstone

Before Refining the Edge, Restore the Geometry

Not every dull knife can be properly restored simply by sharpening the cutting edge.

Large chips, distorted profiles caused by years of sharpening, excessive thickness behind the edge, or blades that require significant thinning all demand something more fundamental:

material must first be removed where necessary to restore the blade geometry.

The Naniwa Gouken Aramusha #220 is a Japanese-made coarse whetstone designed for exactly this kind of demanding work.

With the aggressive cutting performance of its #220 PA abrasive, strong resistance to dishing, and substantial 205 × 75 × 50 mm dimensions, the Aramusha is built for serious coarse sharpening and corrective work.

This is not simply a stone for touching up a dull edge.

It is a coarse stone for working on the geometry of the blade itself.

Serious Correction Requires the Right Coarse Stone

Removing a significant chip.

Thinning a blade that has become too thick behind the edge.

Correcting a profile that has gradually changed after years of sharpening.

These jobs require substantial material removal. Starting with a stone that is too fine makes the work unnecessarily slow and asks the stone to perform a task it was never designed to do.

The Aramusha #220 is designed to remove steel efficiently during the early stages of substantial sharpening and restoration work.

It can be used with Japanese and Western kitchen knives, as well as other cutting tools including planes, chisels, carving tools, and various carbon, stainless, and specialty steels.

Once the necessary geometry has been established on the coarse stone, the sharpening progression can continue through medium and finer stones as required.

The quality of a finished edge does not begin with the finishing stone.

It begins with getting the geometry right.

PA Abrasive — Cutting Performance with Strong Surface Retention

The Gouken Aramusha #220 uses PA abrasive and is designed to combine strong cutting performance with good resistance to dishing.

That balance matters in a coarse stone.

When thinning a blade or correcting geometry across a large surface, the stone itself is continuously wearing as it removes steel. If the sharpening surface dishes too quickly, maintaining the intended blade geometry becomes increasingly difficult.

The Aramusha is designed not only to remove material efficiently, but also to maintain its working surface well during demanding coarse sharpening.

For serious corrective work, both qualities matter.

Why 50 mm of Thickness Matters

One of the most distinctive features of the Aramusha #220 is its substantial size:

205 × 75 × 50 mm

That 50 mm thickness has real practical value.

A coarse whetstone is a consumable tool. As it removes steel from the blade, the stone itself is gradually worn away and periodically flattened.

For occasional sharpening, this may not seem important.

For repeated chip repair, thinning, geometry correction, and restoration work, however, stone consumption becomes a significant consideration.

The substantial thickness of the Aramusha provides considerably more usable stone for those who regularly perform demanding coarse sharpening.

It is a stone designed to be used — and used seriously.

Recommended For

The Naniwa Gouken Aramusha #220 is particularly suitable for work requiring significant material removal, including:

• Repairing large chips
• Correcting blade profiles and geometry
• Thinning excessively thick areas behind the edge
• Restoring geometry altered by years of sharpening
• Coarse sharpening before progressing to medium stones
• Major maintenance of Japanese and Western kitchen knives
• Coarse sharpening of planes, chisels, and carving tools

Its purpose goes beyond simply restoring sharpness.

It helps establish the correct foundation for everything that follows in the sharpening process.

How to Use

The Gouken Aramusha #220 is a water-soaking whetstone.

Before use, soak the stone in water for approximately 5–10 minutes, allowing it to absorb sufficient water.

During sharpening, add water as necessary and keep the working surface appropriately wet.

After use, thoroughly rinse away swarf and sharpening residue, then allow the stone to dry naturally in a well-ventilated area away from direct sunlight before storage.

Avoid rapid drying and extreme temperature changes.

Although the Aramusha is designed for strong surface retention, every coarse stone will gradually wear during use.

For thinning and geometry correction in particular, surface flatness directly affects the accuracy of the work. Flatten the stone whenever necessary to maintain a true working surface.

Specifications

Product: Naniwa Gouken Aramusha
Manufacturer: Naniwa Abrasive Mfg. Co., Ltd.
Series: Gouken
Model: QA-0331
Grit: #220
Type: Coarse Whetstone
Abrasive: PA
Dimensions: 205 × 75 × 50 mm
Weight: Approx. 1.7 kg — individual variation may occur
JAN: 4955571237033
Country of Origin: Japan