My relationship to reality has been so utterly skewed for so long that I don’t even notice it any more. It’s just my reality.Ethan Hawke
The Taming of the Skew
Beloved Customer has of course noticed that it is easier to keep a blade stable when sharpening its bevel if you skew it on the stone. There is nothing wrong with skewing the blade so long as you understand the natural consequences of doing so and compensate for them appropriately.
Let’s examine some of those consequences.
First, a skewed blade tends to wear-out, or hollow-out, the center area of the stone quicker. This is inefficient, wasting time and stones, but can be compensated for if you pay attention and work the blade evenly over the stone’s entire face. BTW, this is not a kindly suggestion but a commandment.
Second, it is human tendency to place uneven pressure on a skewed blade, with the natural result that the blade wears unevenly. Think about it now.
In addition, the leading corner is exposed to more fresher, larger grit particles (which cut more aggressively) than the trailing corner. As a result, the blade’s leading corner tends to be abraded more, causing the blade’s edge to gradually become skewed or rounded in shape over many sharpening sessions. This is definitely bad, and is often mistaken for the work of those devilish iron pixies, especially in the case of kiwaganna and other skewed-blade planes, causing self-doubt and mental anguish (aka “going bananas”). But if you are aware this can happen, and pay attention, you can easily compensate for it.
Third, and I have no way to confirm this, I am told by the guys with microscopes that diagonal scratches at the extreme cutting edge leave it a tad weaker, causing it to dull just a bit quicker.
The way to compensate for this is to keep the blade’s cutting edge perpendicular to the direction of travel during the last few strokes on the finishing stone.
So in summary, habitually skewing a blade while sharpening is fine, but may cost a little efficiency, and may cause your blades and stones to become distorted.
Please read the quotation at the top of this article and consider whether or not your sharpening reality has become skewed without your realizing it. Your humble servant confesses that his was for a long time.
These aren’t things you wouldn’t have figured out for yourself eventually, Beloved Customers and Gentle Readers, but now, at least if you pay attention, you’re a few years ahead on the learning curve.
In the worst case, at least ignorance isn’t an excuse anymore.
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Other Posts in the Sharpening Series
- Sharpening Part 1
- Sharpening Part 2 – The Journey
- Sharpening Part 3 – Philosophy
- Sharpening Part 4 – ‘Nando and the Sword Sharpener
- Sharpening Part 5 – The Sharp Edge
- Sharpening Part 6 – The Mystery of Steel
- Sharpening Part 7 – The Alchemy of Hard Steel 鋼
- Sharpening Part 8 – Soft Iron 地金
- Sharpening Part 9 – Hard Steel & Soft Iron 鍛接
- Sharpening Part 10 – The Ura 浦
- Sharpening Part 11 – Supernatural Bevel Angles
- Sharpening Part 12 – Skewampus Blades, Curved Cutting Edges, and Monkeyshines
- Sharpening Part 13 – Nitty Gritty
- Sharpening Part 14 – Natural Sharpening Stones
- Sharpening Part 15 – The Most Important Stone
- Sharpening Part 16 – Pixie Dust
- Sharpening Part 17 – Gear
- Sharpening Part 18 – The Nagura Stone
- Sharpening Part 19 – Maintaining Sharpening Stones
- Sharpening Part 20 – Flattening and Polishing the Ura
- Sharpening Part 21 – The Bulging Bevel
- Sharpening Part 22 – The Double-bevel Blues
- Sharpening Part 23 – Stance & Grip
- Sharpening Part 24 – Sharpening Direction
- Sharpening Part 25 – Short Strokes
- Sharpening Part 26 – The Taming of the Skew
- Sharpening Part 27 – The Entire Face
- Sharpening Part 29 – An Example
- Sharpening Part 30 – Uradashi & Uraoshi