If you do not change direction, you may end up where you are heading.Lao Tzu
When using the rough stones, and especially when learning basic sharpening skills, it is best to sharpen the bevel in one direction only, lifting the blade off the stone, or at least removing all downward pressure, on the return stroke. The reason for this seemingly inefficient movement is simply that, at least for most people, trying to abrade the blade on both push and pull strokes is extremely likely to cause the blade to rock creating the dreaded bulging bevel.
There are certainly exceptions to this rule, and we actively encourage you to try to develop the concentration and muscle control required to sharpen in both directions on rough and medium stones, but be aware it may take some years. In the meantime, remember the ancient adage and imperial moto: festina lente, which we chose to translate as “Slow is smooth; Smooth is fast. “
Part of the difficulty of sharpening in both directions is the resulting loss of concentration: the swing of the thing is hard to sense. Perhaps another part of it is due to the difficulty of controlling the complicated and constantly-changing angles of bones and joints. Both of these natural mental and physical tendencies can be overcome by talented and determined people given time and daily practice, but in the case of everyone your humble servant has ever spoken with on the subject, it takes years of focused on-the-job practice, and extreme concentration at first to overcome pre-existing bad habits and avoid developing importune muscle memory.
At this point you need to make a decision, unless you have already made it inadvertently. That is, whether to sharpen on the push stroke (pushing the blade away from you) or on the pull stroke (pulling the blade towards you). Most people choose the push stroke, as do I, but in reality the pull stroke is actually a little more efficient because the pressure tends to focus closer to the bevel’s front instead of back, and rocking is reduced. Whichever direction you choose, use it consistently.
However, and this is critically important, when it comes to the final finishing stone, work the blade back and forth in both directions. The finishing stone is not abrasive enough to change the bevel’s shape, and since you need to polish the last few microns width of blade’s cutting edge, a very tiny amount of unintentional rocking is actually helpful, as mentioned in a previous post.
If Beloved Customer is determined to develop the ability to sharpen on both push and pull strokes, your humble servant can share some helpful guidance that was given to me many years ago by a sword polisher.
The first step in training yourself is to begin by lifting the blade from the stone’s surface entirely on the return stroke (either push or pull depending on your preferred direction). All the things mentioned above apply. Becoming proficient with this technique is foundational. Strive to project your senses into the blade traveling over the stone, indeed right down to the last few microns of the cutting edge, and become Zen master Bubba.
When you are able to create a sharp edge while maintaining a flat bevel consistently and without much concentration using this “one-way” technique, then move on to the second step, which is to keep the blade in contact with the stone on the return stroke, but relieve all downward pressure. Begin slowly with full concentration and strive for smooth motion. It’s at the transition from one direction to the other where Murphy will toss a banana peel under your heel.
And finally, when you have mastered the “light-touch” technique, try applying downward pressure in both directions, beginning slowly at first and with full concentration striving for smooth motion.
Remember, don’t grip the blade like a thrashing snapping turtle, but hold it lightly in your hands like a small bird: too tightly and it will be crushed; too loosely and it will fly away.
Don’t lock your wrists or elbows, but actively and consciously rotate them to keep the blade’s bevel always perfectly flat on the stone (your stone is flat right, right?).
And don’t forget to use your small, thin stainless steel straightedge and brass bevel gauge to frequently check the bevel for flatness and proper angle.
And as always, brutally crush and sow salt on bad habits, and don’t allow new bad ones to take root.
Sadly, this is a skill that, once learned, tends to deteriorate with time unless practiced frequently. As with cherry blossoms, muscles, tendons and eyes are neither static nor eternal. Setsunai, desu ne.
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Other Posts in the Sharpening Series
- Sharpening Japanese Woodworking Tools 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 28 – The Minuscule Burr
- Sharpening Part 29 – An Example
- Sharpening Part 30 – Uradashi & Uraoshi