Covington & Sons

A 48mm oiirenomi by Hidari no Ichihiro

When you want to help people, you tell them the truth. When you want to help yourself, you tell them what they want to hear.

Thomas Sowell

A couple of questions prospective Beloved Customers frequently ask your humble servant is what variety Japanese chisel(s) they should purchase, and the best width(s).

In this article I will summarize the answers I most often offer, and list the advantages and disadvantages of 3 types of striking chisels. Perhaps it will be informative.

I started using Japanese chisels long before the internet was more than a group of linked university library research computers. I’ve learned a few things on the subject from Japanese language books over the years, but I’ve yet to read anything on the internet that was more than a regurgitation of marketing screeds and BS from self-proclaimed experts. Most of what I know about Japanese chisels I learned from Japanese blacksmiths and professional woodworkers in Japan, and from my own hands-on, trial and error experience using them to make a living.

Even after the internet expanded (or rather blew up like a dynamited outhouse) into world wide web we know nowadays, there was very little useful written information available in the English language anywhere regarding the varieties of Japanese chisels and how to maintain and use them. This frustration was my primary reason for establishing this website, in fact. But after starting this humble website I’ve noticed more and more people presenting themselves as experts on the internet who merely imitate, indeed plagarize, what I’ve written. Do they do this to improve general knowledge on the subject of Japanese chisels, or do they have other motives?

Posers and copycats are fine, but many lack the true understanding that only comes with hands-on experience under pressure. I encourage Gentle Readers to seek useful knowledge based on practical experience rather than ill-informed click bait.

Regarding my answers to the two questions listed above, let’s begin by considering the options I believe most likely to serve Gentle Reader best.

As this article: The Varieties of Japanese Chisels explains at length, there are two primary types of Japanese chisels: the tatakinomi striking chisel and the usunomi paring chisel. In this article we will examine only tatakinomi.

A 42mm oiirenomi by Sukezane Tatakinomi (Striking Chisel)

The three types of chisels described below are categorized as “Tatakinomi” which translates directly to “striking chisel.” It’s name’s derived from the way one motivates it by “striking” the butt of its wooden handle with a steel hammer. No, not an inefficient, imprecise wooden mallet but a serious, differentially-hardened, high-carbon steel tool.

What is a Gennou Hammer?

Hammers to Use With Chisels Part 2 – Hammer Faces

Head Style & Weight

Tatakinomi are the best-known type of Japanese chisel, but there are other kinds, primarily “usunomi” or paring chisels.

Because high-quality chisels are not free, and because the powerful forces applied to tatakinomi place it at risk, it’s important that those you procure be durable, so let’s next consider consider some factors impact that always govern a chisel’s durability.

Keys to Chisel Durability

High-quality, hand-forged (vs. stamped, mass-produced) Japanese striking chisels differ from Western-style chisels in that they are intended to be wacked hard all day with a steel hammer, treatment that will quickly destroy Western chisels, but which professional-grade, handmade Japanese chisels eat with chips and beer.

But why can our tataki chisels shrug-off abuse that would destroy all other chisels? There are three primary reasons. First, the handles are made of either Japanese red oak or Japanese white oak, varieties of hardwood native to Japan significantly denser and stronger than all species of American and European oak.

The second reason is that the handle is reinforced by a steel ferrule in the shape of a hollow “truncated cone,” called a “kuchigane,” which translates to “mouth steel,” carefully fitted to the contoured blade end of the handle.

This component doesn’t just perch on the handle like a pelican on a post but squeezes and compresses the wood fibers around the tang of the blade making it nearly impossible for the impact forces of a hand-operated hammer to split the handle. In fact, the harder the handle is struck the tighter the kuchigane becomes, the more constraining hoop pressure it applies to handle. This is a genius design detail, one commonly found in many ancient weapons (swords, spears, and pole weapons) around the world, BTW. I’ll be dipped in chocolate and sold as a hairy truffle if I can figure out why European and America tool makers abandoned this technique a hundred or so years ago. Perchance an early example of enshittification?

The third reason the handles of hand-made Japanese chisels can eat up such abuse without getting ulcers is a piece of furniture called the “crown,” what some people vulgarly call the “hoop,” a steel band with a particular cross-section encircling the butt end of the handle. If the crown and handle are fitted properly (the majority of Japanese chisels sold overseas are not, BTW), this crown will apply tremendous hoop force on the wood preventing it from splitting.

An important detail worth knowing is that this crown doesn’t just sit on the handle like a metal hatband, but is designed to slowly move down the length of the handle as the handle becomes shorter over the years providing continuous support for the handle without the need for future adjustment. Ergo the nickname “sagariwa.” Clever stuff.

Another less-obvious reason high-quality chisels can happily endure such abuse is the fact that the handles are hand-turned of dense, well-dried, defect-free Japanese hardwood, and hand-fitted to the blade by an experienced Japanese craftsman who specializes in making handles (Mr. Hasegawa, in our case) with many years of experience, to ensure a proper fit between wood and steel components. Such handles cannot be procured in bulk from Chinese farmers. Why does this matter? A sloppy fit between steel and wood will not only reduce a chisel’s useful lifespan, but will actually reduce its efficiency.

The Three Types of Tatakinomi

Let’s next consider the three main types of tatakinomi, the oiirenomi, hantatakinomi, and atsunomi.

The Oiirenomi Chisel

The most popular type of tatakinomi striking chisel sold nowadays is the mentori oiirenomi, pronounced oh/ee/reh/noh/mee). This is the Japanese chisel best known outside Japan. A couple of variants are the older-style kakuuchi oiirenomi and the slimmer shinogi oiirenomi.

The oiirenomi is a smaller, lighter, more economical version of the bigger, older atsunomi style chisel. Just as I have done so often in answer to questions from prospective Beloved Customers, I’ve compared some of the key advantages and disadvantages of the oiirenomi compared to the hantataki and atsunomi below. Horses for courses.

Oiirenomi’s Advantages:

• More compact (shorter and slimmer) than the atsumomi and hantataki chisels, the oiirenomi is extremely handy for making light cuts in tight spaces, for making furniture and cabinets, and doing installations. Being less bulky, oiirenomi take up less space in the toolbag/toolbox, and accordingly are easier to transport to and around the jobsite.
• The oiirenomi’s lighter weight, compared to atsunomi and hantataki, makes them easier for those with weaker hands to use.
• Oiirenomi can be motivated with a lighter hammer and/or less force for more precise work in some jobs.
• Less costly than atsunomi and hantatakinomi.

Oiirenomi’s Disadvantages

• While compact and lightweight, their blade, neck and handle are shorter in length than atsunomi and hantataki making them unsuited for some deep cuts. This is seldom a problem when making furniture and cabinets, but their shorter reach may limit their effectiveness in some carpentry and timber framing projects.
• Their reduced weight is achieved by reducing the amount of metal used and employing a shorter handle that some users with large hands sometimes find inconvenient.
• Most importantly, the reduced weight is achieved by incorporating less metal in the blade, neck and shoulders making the oiirenomi relatively weaker and less durable when subjected to the heavy pounding required to cut the large joints and hog the large volume of wood required when timber framing. For the same reason, wider blades (42mm+) may not be adequately supported by the thinner neck and lighter shoulders of the oiirenomi.

The oiirenomi is perfect for most furniture and cabinetry tasks around the shop, and is very portable for jobsite use, but it may not be suited to heavy carpentry, timber framing or for use by those with humongous hands.

Professionals that use chisels from morning to night, however, prefer the atsunomi for even small jobs simply because it’s stronger, cuts with more authority and lasts much, much longer.

The Hanataki Chisel

The hantataki chisel is a larger, longer version of the oiirenomi, or depending on your viewpoint, a smaller version of the atsunomi. It has both advantages and disadvantages when compared its brothers.

Hantataki’s Advantages

• Hantataki chisels are an “in-between” chisel built longer and somewhat beefier than oiirenomi chisels, but shorter and lighter than atsunomi chisels, depending on your viewpoint again. They take up less space in the toolbox/toolbag than atsunomi and are therefore easier to transport.
• Their greater length compared to oiirenomi makes them handier for those with larger hands.
• Hantataki can cut deeper/longer joints than oiirenomi can.
• While not as heavy-duty as atsunomi, hantataki are significantly beefier and stronger than oiirenomi and therefore better suited to cutting joints in large timbers using heavier hammers. They make great chisels for carpentry work in the field.
• Our hantataki chisels are priced nearly the same as our oiirenomi chisels, making them an economic choice.

Hantataki’s Disadvantages:

• Hantataki chisels can’t cut as deeply as atsunomi, but this is seldom a serious limitation except in timber framing work.
• While heavier and tougher than oiirenomi they are lighter than atsunomi. Horses for courses.
• They are not as strong as atsunomi and may be at a disadvantage for some heavy timber framing jobs. Although we carry them in 54mm width, this may be a little too wide for the shoulder to adequately support during heavy use.

The Atsunomi Chisel

Atsunomi (ah/tsu/noh/mee) are the largest standard size chisel. There are special-order chisels with longer necks, such as the anayanomi, for cutting special joints (no longer made), but this is the chisel used for serious, heavy-duty carpentry and all timber framing jobs.

A 54mm anayanomi (a long-necked atsunomi) by Nora. The long neck is for making deep cuts.

Atsunomi means “thick chisel,” which explains it well. As an example, our 48mm wide Sukemaru-brand atsunomi are 295mm long (OAL) 11mm thick, with an 85mm long blade, 70mm long neck, and weigh 426 grams, almost twice the weight of our 48mm Sukezane-brand oiirenomi chisel.

Two of your humble servants well-used chisels by Kiyotada. Top: Oiirenomi with white oak handle. Bottom: Atsunomi with red oak handle.

Atsunomi’s Advantages:

• Long blade, neck and handle allow this chisel to make deep cuts in heavy timbers, this chisel’s greatest advantage.
• Thicker blade and neck make the atsunomi much stronger and tougher for hard cutting all day long.
• The extra mass of the atsunomi cushions the impulse shock acting on user’s hand and wrist joint compared to the same impulse forces acting through lighter oiirenomi or hantataki.

Atsunomi’s Disadvantages:

• Being bulkier and heavier, transporting atsunomi by bus, train, bicycle or mare’s shank is relatively more work.
• Their extra mass requires a heavier hammer to motivate in order to make the same cuts as the oiirenomi and hantataki. This requires a greater expenditure of energy,.
• Being heavier, the user may need stronger hands and arms than when using smaller chisels.
• Although the extra weight and increased moment of inertia makes the atsunomi more stable than other chisels, it requires greater skill when making delicate cuts.

Blade Width

“What’s best blade width for the job” is another question people always pose, but it’s a a bit more difficult to answer. The following are some points to consider.

First, if you will use the chisel(s) to cut mortises you either need to (1) determine in advance what width mortises you will need to cut; or (2) The likely range of mortises. The difficulty of answering these questions, and the fact that the answer varies from job to job, is why professionals end up owning more than one or two chisels.

But how to decide? If the mortise is fairly narrow, say 6~15mm, then owning a chisel the same width is most efficient. In the case of wider mortises, it’s often best to use a chisel a little narrower than the mortise hole, and then pare the walls to final dimension. Why? Because, unless you’ve had a lot of practice, and your chisel has tight tolerances, it may tend to bind in the mortise hole and maybe even gouge the sidewalls. But by paring to final dimensions, the width of the mortise hole can be kept within tolerances and the sidewalls kept free of gouges.

When all’s said and done, and when speed and precision are critical, it’s best to check, adjust and maintain the tolerances of your chisels.

Another point to keep in mind when planning mortises is that it’s almost always most efficient to match the width of the mortise to the dimension your chisel can most easily, precisely and consistently cut rather than planning the mortise width around some specific dimension, e.g. precisely 6mm. One then cuts each specific tenon to fit each specific mortise instead of some dimension on a drawing. Once you have your chisel setup properly and a mortise gauge with a matching setting, there will be no need to measure mortise width at all.

People always ask what 3 or 4 chisels they should purchase to get started making furniture, for instance. The easy answer is 6, 9, 12, 24mm. Why not wider? I love wide chisels, but if you only have a few chisels, you will need one on-hand that does a great job of paring. 24mm is about the maximum width the average guy can precisely motivate a chisel by hand without using a hammer. Of course, this capacity will vary with the joint being made and the hardness of the wood, but 24mm is standard.

While we’re on the subject of paring, the handles of oiirenomi are too short for a powerful grip and good control with two hands, and the steel crown tends to be hard on one’s hands. For these reasons, the usunomi paring chisel with its thinner, longer blade, neck and handle, and lack of a crown is ideal. If you don’t have any yet, you will find usunomi to be wonderful tools and great friends.

Conclusion:

The oiirenomi is a compact, lightweight, nimble and less-costly striking chisel suited for light cuts with moderate weight hammers. It’s the typical starter chisel for Japanese woodworkers, and the only variety of Japanese chisel most Western woodworkers know. Perfect for making furniture, cabinets, and most joinery. Being lightweight, it will not endure long sessions being pounded on with heavy hammers. Also, being short, it may not be suited for those with large hands.

The hantataki chisel by comparison is slightly larger than the oiirenomi. It’s relatively inexpensive, not especially heavy, and can cut deeper joints. It’s perfect for those with larger hands that find the oiirenomi uncomfortable to use. And it will do everything the oiirenomi can and more.

The atsunomi is the largest, heaviest, strongest and most durable of the Japanese chisels. It’s ideal for heavy work such as timber framing and wasting large amounts of wood quickly. Besides carpenters and timber framers, many professional craftsmen in Japan, even those that never work on construction sites, prefer to use atsunomi even for delicate work because of their relatively longer blades and cost-effectiveness.

Because of its greater size and weight, the atsunomi is not as nimble as the smaller varieties of tatakinomi and demands greater strength and skill of the user. But on the other hand, it’s very stable in the cut, wastes wood with impressive gravitas, and will endure many decades of hard daily use in professional situations without complaining.

YMHOS

A folding screen by Kano Hogai with an ancient plum tree, bamboo, and birds. This screen is a designated “natural treasure.”

The Varieties of Japanese Chisels

The Mentori Oiirenomi (面取追入鑿）

The Kakuuchi Oiirenomi (角打追入鑿）

The Hantataki Chisel

The Atsunomi （厚鑿)

The Usunomi Paring Chisel

If you have questions or would like to learn more about our tools, please click the see the “Pricelist” link here or at the top of the page and use the “Contact Us” form located immediately below.

Please share your insights and comments with everyone in the form located further below labeled “Leave a Reply.” We aren’t evil Google, megalomaniac Meta, or sticky-fingered Apple and so won’t sell, share, or profitably “misplace” your information. If I lie may a Bandersnatch fruminate all over my face!

A giant California redwood tree located at the time of this photo near my former home in Forestville California. The gentlemen shown have done a marvelously clean bit of work up to this point using only a two-man saw and their axes. A serious job performed by serious men.

All that is gold does not glitter,
Not all those who wander are lost;
The old that is strong does not wither,
Deep roots are not reached by the frost.

From the ashes a fire shall be woken,
A light from the shadows shall spring;
Renewed shall be blade that was broken,
The crownless again shall be king.

J. R. R. Tolkien, The Fellowship of the Ring

Thank you for visiting our humble website, focused primarily on woodworking tools, especially those made by Japanese craftsmen for Japanese professional carpenters and woodworkers.

Consistent with the educational and contemplative nature of this website, in this article we will examine the nature of wood itself including the trees that produce it, two of their controversial by-products, and a couple of techniques for dealing with wood’s inherent weaknesses of which Gentle Reader may not be aware. It will a useful read without being boring, I swear by Grabthar’s Hammer!

The Miracle of Trees

As a matter of common sense, most people assume that trees, such as the California Redwood shown above which once grew very near my old house in Forestville, grow to such height, diameter and mass by extracting minerals from the ground at their roots. That huge mass must come from somewhere, right?

Of course trees do extract some minerals from the ground, along with many tons of water. But if it’s as simple as that, please consider why trees don’t create correspondingly huge depressions in the soil into which they are rooted, depleting minerals and biomass from the soil. Moreover, please consider how trees add biomass to the soil they’re rooted in instead of making a hole. You’ve heard of conservation of energy, no doubt, but is conservation of mass a thing?

Most people think plants and trees are made of minerals robbed from soil, but the fact about trees and plants so heavily hushed-up nowadays is that they are built almost entirely of carbon extracted directly and entirely from the atmosphere. Yes, from thin air.

Clearly, despite what the doom goblins wail on TV in order to shame and cooerce actors and politicians for support, to solicit clicks, and to extort donations, carbon dioxide is a useful substance critical to all plant life; it’s not the poison the smelly, screeching doom goblins claim it is. Consider what would happen to this planet and all creatures who live on it if carbon dioxide went away. Or if oxygen went away. Ah! Could it be there’s no money to be made by speaking the simple truth rather than inciting panic?

A climate scientist fleecing the ignorant (and gullible) masses. I wonder if he has any of my favorite Idiotbegone pills in his wagon?

Of course, plants do extract a few minerals from the soil along with great amounts of water. Powered only by sunlight, plants and trees remove carbon from the air and use it to create cellulose, a material very similar to sugar, BTW, and which many insects and animals, but not humans, can digest. Think grass and other plant matter.

Show me a single “scientist” that can replicate this miracle in a lab and I will bow down and kiss his bulging bunions. Good luck in your search for that miracle worker, but in the meantime, I won’t be needing any scientific kneepads.

Plants need free carbon dioxide in the atmosphere to grow, and animals, including me and thee, need both plants and oxygen. Indeed the greater the concentration of CO2 available, the more plants grow, the more CO2 they remove from the atmosphere, and the more oxygen they produce. Indeed, every molecule of oxygen surrounding planet earth was respirated by a plant. Hmm, sounds a lot like an endless, natural cycle, one that animals and humans rely on unconditionally. Imagine that…

Plants are marvelous sunlight-powered miracles. And don’t forget, except for the salt, every crumb of every ingredient in your peanut butter, humus and boiled mutton sandwich on rye originated with plants produced using sunlight, carbon, and water.

The Importance of Wood

Wood is a wonderful material, used by humankind since well before the archaeological record to produce heat, light, shelter, clothing, tools, weapons, food and water. Even today it remains the supreme catalyst.

Although computers, concrete and carbon fiber get all the attention nowadays, and those who evaluate the complicated “environmental” impacts of materials on this world carefully ignore it, there would simply be no human civilization without wood.

There are those who disagree with this statement, mostly highly edumacated individuals affiliated with supposedly serious organizations, many of whom are short-sighted, financially-conflicted souls with short attention spans that never exceed the news cycle, and who, despite clear evidence to the contrary, choose to equate the use of wood with the destruction and/or pollution of the natural environment for fun and profit.

Of course, they believe, or at least profess, that the carbon released by the combustion and decomposition of wood is wholly poisonous. These nitwit geniuses instead promote the supposedly “ecological” use of steel and concrete and petroleum products instead, all materials that require huge amounts of energy to fabricate, transport and recycle, all while while releasing millions of tons of truly (versus imagined) poisonous substances into the natural environment annually. Alas, the medicinal cure for idiocy your humble servant strongly advocates is apparently not yet widely available.

Wood contains a tremendous amount of energy, as Gentle Reader has observed in wood-fueled fires. The immutable laws of thermodynamics state, in essence, that all heat comes at a cost. Oil costs money to pump, transport and refine as well as special machinery to use it, but the heat given off by wood is simply the conversion of sunlight gathered by the plant while it was alive back into heat and light. A complete and pure circle.

Sure, the combustion and decomposition of wood releases carbon back into the ground and atmosphere, but every molecule of carbon released by wood was originally extracted directly from the atmosphere by many, many plants over many many cycles. Therefore, plants remove carbon from the atmosphere, and only release that carbon when they return to the big lumberyard in the sky. This is true “net zero,” without the production of an ounce of pollution, unlike steel, concrete, oil, coal and every other fuel and material used by mankind without exception.

I’m not suggesting the use of petroleum and coal and windpower, within limits, is irresponsible, but if the environment is important to you, as it should be, then using organic materials and fuels instead of oil, coal, steel, concrete and wind turbines should be a high priority.

Furniture Pests

Our Beloved Customers use our tools to make elegant, useful stuff out of wood. This wood is formed of cellulose, the most abundant organic compound on Earth, one very similar to but fundamentally different from the sugars we consume for energy. Many animals, including herbivores such as elephants, cows, rabbits and termites have the built-in ability to convert the cellulose in the plant matter they eat into energy by a process we cannot replicate. Humans can’t do this, nor have we figured out a way to accomplish this apparent magic without the intervention of animals, insects or fungus. Once again, puffed-up prideful science can’t do what every carpenter ant and every mushroom obediently does without even be asked to.

A part of the “carbon cycle” relies on such animals, bugs and micro-organisms. If left to their own devices bugs and fungus quickly recycle wooden objects, including houses, furniture and parts of our tools made from wood. You may not have noticed these pesky critters, but you’ve probably seen the holes they chew and the wood dust they excrete. Check an old tool handle, handplane body, or antique table leg for evidence of death watch beetles of powderpost beetles, two common varieties of bugs commonly called “furniture beetles.”

I don’t know about you, but I hate the very idea of icky bugs eating my furniture, tools and handiwork. But what to do?

There are plenty of chemicals manufactured to make wood taste yucky to bugs and fungus, but most of those are toxic and/or carcinogenic so you wouldn’t want to leave them in contact with your skin or lungs for any period of time. But what’s a safe way to keep bugs and fungus from chewing on your workbench, furniture, tool handles or plane bodies? And what can be done once some of them have taken up residence therein?

Termites are are problem bugs, too of course, but most of them prefer a higher moisture content in the wood they dine on than is typically found in houses and tools. That said, I’ve seen subterranean termites and Formosa termites in Guam swarm and eat interior furniture and wooden doors down to hollowed-out toilet paper tubes in front of my eyes. Scary stuff. This is precisely why people don’t build much of anything from wood on that island but spend lots of money on chemicals to prevent termites from turning cellulose into bug crap.

For example, while living on Guam, I had a neighbor in the US Airforce stationed there who’d imported some beautiful Amish furniture made of American Cherry wood from his home in Pennsylvania. Unfortunately, there was a crack in the concrete slab-on-grade floor underneath his beautiful dining table with a corresponding gap in the ceramic tile on top that allowed the local termites to access a single cabriole leg of that table unseen. The table collapsed into a pile of sticks and red termite crap after a year. I kid thee not. Vicious, voracious, vile bugs.

If Gentle Reader has ever frequented flea markets and antique shops, or even perused photos of antiques, you will have seen the many holes left by furniture beetles. I own several old hammers, axes and planes with their wooden components riddled with bugholes. But how can you prevent bugs from infesting your valuable wooden objects in the first place without using highly-toxic, corrosive, and expensive chemicals containing lead, chromium and/or arsenic? Easy peezy. Borax is the answer.

A Non-toxic and Inexpensive Method of Wood Preservation

There are any number of effective chemicals available for wood preservation. Borax is what I recommend based on direct workplace experience. Its a naturally-occurring white powder sold everywhere as a laundry detergent additive. But it’s not just for washing Gentle Reader’s socks, oh no. It’s essential in many industrial processes, including blacksmithing, where it’s used as a flux when forge-welding iron and steel. Japanese blacksmiths use it too.

The vast majority of borax is mined in California where there are huge deposits in ancient lake beds. You may have heard of famous “Twenty Mule Team” wagon trains once used to transport borax from Death Valley.

For this application you don’t need wagons or mules, just water and borax powder, but NOT Borax-brand washing detergent. Both are sold as laundry additives, so don’t confuse them.

2 mule team wagon A borax mine in Boron, California USA

To prepare this wood preservative and insecticide, dissolve borax powder in warm water to make a 7-10% mixture. Then spray it onto wooden objects at-risk, or better yet, soak the wooden objects in this mixture and let dry. Be careful not to spray the cat or the carpet.

Borax messes with the internal functions of bugs and fungus, but it’s harmless to humans and domestic animals to handle, so long as you don’t soak in it and ingest it. Indeed borax and its variants are the only sure way to protect wood against bugs and rot without putting human life and health at risk. No VOC risk. No carcinogens. It won’t pass through skin. No environmental contamination risk (that’s important). Won’t corrode metal fasteners. It has no odor. And it’s cheap. These are all important reasons for woodworkers to use borax.

There are only two downsides to using borax. First, since it’s water soluble, you need to keep wood treated with borax from repeated wetting or the borax will leach out. Second, you need to keep wood treated with borax out of direct contact with soil because moisture in soil will, once again, leach borax out of wood.

I add borax to the water I soak my sharpening stones to prevent crud from growing. It works for years at a stretch, and doesn’t harm any variety of sharpening stone, synthetic or natural, nor does contact with dissolved borax harm me, or even irritate my skin, so long as I don’t drink it (see the Wood Finisher’s Pledge above). That said, I don’t bathe in it, and I understand that some people have a reaction, so don’t go crazy.

Borax also makes the water alkaline preventing rust.

But before using this mixture to treat wood, please recite the Wood Finisher’s Pledge along with me now: “I will not drink wood preservatives, use CCA impregnated toothpicks, nor wash my face with oven cleaner.”

A Quick, and Cheap But Slightly Toxic Way to Eliminate Bugs from Wood

Borax will kill bugs already in the wood given time, but is there a quicker way to get rid of those voracious beasties?

Here’s a technique to deal with wood-eating bug infestations I learned from woodworkers in Japan. I’m sure its not unique, but I’ve never heard of it being used elsewhere.

Before employ this methodology, please recite the Wood Finisher’s Pledge again, but with more feeling this time.

Simply find the entrance/exit holes bugs chew into and out of an infested wooden object and, using a syringe or pipette, squirt or drip a little gasoline into each of them. You might even soak the wood overall in a bit of gasoline.

But, be warned, because Murphy rules the universe and truly wants to hurt you and yours, be sure you do this outdoors well away from anything flammable. Also be sure to put out your stogey, give your Puffco Cupsy bong a rest, and dial down your “electrifying personality” because “hair on fire” is not simply a real risk around uncontained gasoline, it’s practically garan-frikin-teed.

After judiciouly and carefully applying this small amount of gasoline, you can wrap the object in plastic, or place it into some kind of airtight container, to allow the gasoline vapors to permeate the wood. Do this outdoors, once again, and refrain from smoking. The gasoline fumes will promptly send the bugs, their eggs, and all their chilluns to the big lumberyard in the sky. In nomine Patris et Filii et Spiritus Sancti, Amen.

After a few days, unwrap/unseal the wooden object and place it outdoors in the sunlight to remove the smell of gasoline.

This technique works perfectly, everytime, and cost almost nothing. The chemical companies don’t make a penny on this process which is why you’ve never heard of it.

YMHOS

If you have questions or would like to learn more about our tools, please click the “Pricelist” link here or at the top of the page and use the “Contact Us” form located immediately below. You can also reach us at Covingtonandsons@gmail.com

Please share your insights and comments with everyone in the form located further below labeled “Leave a Reply.” We aren’t evil Google, fascist facebook, or the Congressional IT department of the Democrat Party and so won’t sell, share, or profitably “misplace” your information. If I lie may bugs eat all my tool handles, and food taste like charcoal.

Preventive Maintenance: Don’t start today by doing yesterday’s work.

– Deniece Schofield

Maintaining, transporting and storing handplanes and other handtools is a simple job, but some review might be useful.

High-quality handplanes are not cheap, and when you have a good one in good fettle, the time and effort it takes to maintain it ready to rock and roll immediately is never wasted. Indeed, it’s a solid investment that pays higher dividends than General Electric stock ever will, I promise you, on condition that the maintenance is done right, and your handplanes are stored and transported properly. On this subject as in many others, knowledge is power, so let’s get some.

Maintenance

The quote at the top of this article by Deniece Schofield describes a sound policy, especially when it comes to tool maintenance.

There are several items to consider when maintaining your handplane. We’ve discussed how to set-up and fettle a Japanese hirganna handplane in previous articles, all listed at the end of this article. In this article we’ll examine how to maintain it while we’re using it, and how to store it when we aren’t.

Sharpening

A dull plane may make excellent firewood, but it’s as useful as a screen door in a submarine, so the first step in keeping it useful is sharpening it. The true value of the high-quality-forged blade in your plane is that it’s easily and quickly made extremely sharp, and it will retain that sharp edge a long time, reducing the time, trouble and cost of maintaining it. Does your time have value?

For detailed directions about sharpening, please read the series of 30 articles linked at the end of this article. They will explain the what and why of the blade of a high-quality plane. If you haven’t already, please read and digest these articles.

Maintaining and Storing a Handplane In-use

The following is a list of maintenance items you should consider performing and the specific conditions under which I think they’re applicable. These are suggestions not rules, of course, but unlike most of the woodworking gurus on the internet, I didn’t steal them from noobtube, nor suggest them because they’re good clickbait, or fish them out of my fundament because they smell like lilacs, or because I think they’ll sell tools or books to the gullible. They are simple and they work, but it’s important to understand the conditions detailed for each item.

1. Condition1 – Overnight Storage: The plane is working fine, its blade is still sharp, and you intend to use the plane in the same place for the same jobs tomorrow, but just need to set aside on your workbench for a few hours, perhaps overnight. You may want to take the following actions:
   • Don’t remove the blade and chipbreaker, but simply wipe the body with a clean, dry rag and clear dust and shavings out of the blade opening with a clean, dry brush. Purpose: To prevent wood resin from accumulating and gumming things up (depends on the wood), and to prevent corrosion.
   • Oil the cutting edge using your trusty, ever-faithful oilpot.
2. Condition 2 – Short-term Storage: The plane is working fine and the blade is sharp, but you need to relocate it to another location for a short time. In this case, you may want to take the following actions.
   • Safe the blade by retracting it into the body using your wood, plastic or leather mallet so it doesn’t become damaged, or damage other tools while lounging in the tool box or tool bag during the relocation.
   • Remove dust and shavings from the plane, especially the mouth opening, because they will make the toolbox or tool bag dirty.
3. Condition 3 – Short-term Storage: The plane is working fine, the blade is sharp but we need to store it out of the way short-term.
   • Remove blade and chipbreaker entirely (see previous article)
   • Clean the blade and chipbreaker of sawdust and wood resin. Resin may have accumulated on the blade and chipbreaker which, if not removed in a timely manner, can harden over time increasing friction. Use you oilpot and a clean rag and/or a small stick of wood to scrape-off built-up resin resin. If that doesn’t work, use acetone or lacquer thinner.
   • Clean dust and shavings from blade opening and mouth with brush/rag.
   • Wipe down the plane’s body with a clean rag.
   • If the body is dirty with oil, sharpening stone mud or fingerprints, clean it all over with your oilpot and wipe. If that doesn’t make it clean enought, dampen a clean rag along with drop or two of dishwashing liquid (neutral PH), then wring it out as hard as you can. Scrub the body clean with this nearly-dry rag. Caution: We need the soap and water to remove oil and dirt, but making the body wet may cause it too warp. When you’re done, make absolutely sure the body is perfectly dry.
   • Oil the blade and chipbreaker.
   • Reassemble the plane but leave the blade’s cutting blade up inside the mouth opening. How tight should you fit the blade/chipbreaker? Tight enough to firmly retain blade and chipbreaker so they won’t rattle out, but no more.
4. Condition 4: Long-term Storage:
   • Remove the blade and its chipbreaker entirely.
   • Clean the blade and chipbreaker removing sawdust and all accumulated wood resin as described above.
   • Apply a protective coating of a paraffin wax-based corrosion prevention product such as CRC 3-36. For longer storage under more difficult conditions, CRC SP-350 or CRC SP-400 are even better.
   • After the carrier has evaporated to some degree, wrap the blade and chipbreaker in aluminum foil and store them together with the wooden body so they won’t become separated. Don’t assemble the parts!
   • Clean the wooden body removing all dust and shavings.
   • Place a mothball in the body’s mouth and wrap the body, along with the blade and chipbreaker, in newspaper, or place it in a plane bag. This will be good for a number of years in any condition except underwater.

Plane Storage on the Workbench, Atedai or Planing Beam

There is some disagreement about how to set down one’s handplanes when they aren’t being used. I won’t consider all the possible options, but will simply present the one that I was taught and use.

The old boys who trained me insisted that it is improper set down a plane with its sole touching the workbench, atedai, tatami mat, carpet or ground for any length of time, but one must instead rest it on its side. After many years of using handplanes, I feel this is a good habit to develop for both Japanese and Western handplanes.

Since I’m right handed, this results in the plane resting on its right side with the cutting edge oriented towards towards the left side as shown in the photo below. This position takes up less space on the workbench, and protects the cutting edge and sole of my plane from contacting anything but air.

Is it rude to rest the plane sole-down, or will it damage it? Probably not, but seeing a handplane with it’s blade oriented up or down bothers me like a bug crawling on my neck. OCD?

I also rest my planes on their sides when placing them in boxes, toolboxes or toolbags even for long-term storage.

One can place a plane on any stable surface it’s willing to sit on, and where it won’t be kicked or fall from, even a chair, bench, board, carpet, floor tile, or other flooring material, but never directly on gritty surfaces such as bricks, paving, concrete, or heaven forfend, the naked ground.

Place the plane resting mouth-down only when the plane is actively being used or it’s wrapped in cloth or newspaper.

Do all Japanese craftsmen follow this rule? Heck no. Why do I recommend these habits? Well, first of all, because this habit shows proper respect to my tools, to the craftsmen that made my tools, and to those who taught me how to use them. Second, because these habits help my tools last longer with less damage. Thirdly, because it helps to keep my workplace better organized.

Until we meet again, I have the honor to remain,

YMHOS

Other Articles in the Japanese Handplane Series:

• Handplanes Part 1: East vs. West
• Handplanes Part 2: Blade Adjustment
• Handplanes Part 3: The Blade
• Handplanes Part 4: Fitting Blade and Body
• Handplanes Part 5: The Chipbreaker
• Handplanes Part 6: Setting-up and Maintaining the Sole
• Handplanes Part 7: Bedding the Blade – Correcting Some Common Misunderstandings
• Handplanes Part 8: Operator’s Manual
• Handplanes Part 9: Maintenance & Storage

Links to Articles 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

A man in love is incomplete until he has married. Then he’s finished.

– Zsa Zsa Gabor

This is the last article in our series about designing and making a handle for a Japanese gennou hammer.

In previous articles in this series Beloved Customer completed designing, shaping and fitting the handle of your gennou hammer and attached the head. Then you tested it and perhaps made adjustments. Assuming Beloved Customer is satisfied with the results of those adjustments, at least for now, the time has come to sand it and apply a finish.

Finishing Options

There are a couple of approaches your humble servant might propose on the subject of finishing tool handles. The first is perhaps the oldest, and easiest, and that’s to do nothing. After all, tools are made for hands not museums, and flashy finishes too often make otherwise workmanlike tools look silly.

In addition, most woods (except for those that might cause allergic reactions) perform just fine unfinished, thankee kindly. In this “au natural” approach, you may choose to leave tool marks on the surface of the handle without sanding them into oblivion, lending your handle undeniable gravitas and dignity, even character.

An unsealed, unfinished handle will, however, unavoidably become stained and discolored, and it’s head may not stay attached as long as a well-sealed, well-finished handle. I say this from experience.

A good light-duty finish material for an au-natural handle is a quality non-slip floor paste wax like Johnson’s well-known product in the yellow metal can. Does it seal the wood? No, but it does help keep the handle looking cleaner. Why floor paste wax? Some waxes, for instance those used to polish furniture and automobile paint, are intended to provide a slick surface that encourages water to run off and to which dirt doesn’t adhere well. History has shown that slippery waxes used on floors will result in slips, falls, and a transfer of wealth to the legal profession. For the same reason, carnuba automotive wax is not ideal for tool handles, while non-slip floor wax is.

And then there are the chemical finishes such as linseed oil (BLO), milk finish, tung oil, shellac, varnish, lacquer, polyurethane, etc. To one degree or another, these chemicals tend to seal the wood reducing the penetration of dirt and oil, and (sometimes) slowing the movement of moisture into and out of the wood.

But what chemical finish is best suited to a gennou handle? It is far beyond the scope of this humble scribble to properly describe, much less evaluate, the many varieties of finish applied to wood, so I will simply provide a few comments.

Linseed oil and BLO, a by-product of the flax plant, are organic materials used for centuries if not millennia as a traditional finish in Europe. It was once used widely for paint and, until it was replaced by rubber and later petroleum products, flooring and waterproofing materials. Have you heard of “linoleum?” Of course, this was back in the day when lead was a common ingredient in paint and makeup. Linseed oil no longer has any value as a finishing material for wood because it never really dries without adding problematic, even toxic, chemicals called “driers,” it seals poorly, collects dirt, and discolors badly over time. But because it’s constantly mentioned in old writings, which many people trust just because they are old, linseed oil products are still in-use today. To advocates of linseed oil products I say “make sure you soak your oily rags in water and dry them outside well away from any fuel (like your house).”

I am a fan of the modern milk paints, but do not like it for tool handles. Nonetheless, it’s a valid option.

Tung oil is an ancient finish, but the price nowadays far exceeds its value, assuming you can even find an unadulterated source.

Shellac creates a beautiful surface coating but it’s far too delicate for tool handles.

Standard synthetic varnish, nitrocellulose lacquer, urethane and polyurethane are readily available, easy to use and can create a beautiful, durable finish, but when used in the traditional manner, the surface film coating they produce eventually chips and cracks with time, exposure to ultraviolet light, and expansion and contraction of the wood to which they have been applied. And every scratch accelerates this degradation.

Why is degradation of film finishes the a problem you say? The obvious downside of a once beautiful finish looking ratty aside, every defect in a surface film finish promotes the movement of moisture into and out of the wood, and of course increases the swelling and shrinkage of the wood it’s intended to protect. What most people don’t realize is that, as time goes by, the solvents and compounds in film finishes intended to provide flexibility in dealing with expansion and contraction of the wood dissipate causing the finish to gradually become more brittle, and break down and crack at a ever-increasing rate, independent of dings and other defects.

In modern times, the use of latex rubber in water-based paints has greatly reduced this problem, but such paints are not especially durable as a tool handle finish.

Sanding

If the au-naturel approach appeals to you, I recommend erasing marks left by files and rasps and replacing them with crisp marks and cleanly cut surfaces left by sharp edged tools like knives, carving tools, and spokeshaves. Unless a chemical sealer/finish material is applied afterward, a plain sanded finish is probably the worst surface treatment possible, whereas a surface cleaned with sharp blades will serve you better. I often use this texture for the endgrain butts of my hammers and saws.

If, on the other hand, you prefer a smoother finish, and are prepared to apply a chemical finish, then by all means sand away. But please do not sand the tenon. If you decide to sand the handle before installing the head, please apply masking tape protection to the tenon.

How fine should you sand your handle? I think 600 grit is fine enough, but I’ve gone as high as 1200 grit on fine-grained, hard woods like black persimmon. Did using such fine sandpaper make a difference? Nah.

After you’ve sanded the surface to where you like it, the next job is to eliminate hidden hairs. No, this does not involve applying hot wax to delicate areas of the body and then violently ripping out body hair so that you look delightfully-sleek in your new sequin string bikini, but rather it’s the job of encouraging the naughty ends of wood fibers still connected to the handle, but currently pressed flat onto and into the handle’s surface, to stand up so we can cut them off using sandpaper.

Dealing with these fiber is always important when finishing wood because, with time and moisture, they may pop up over time creating rough patches in the finish encouraging degradation. Once they are standing and no longer hidden, we can cut them off at the base with sandpaper to create a durable, smooth surface long-term even when exposed to moisture and sweat.

Although it’s not used much nowadays, sanding sealer was originally a shellac product developed specifically for this purpose.

To raise hairs, lightly wet the handle’s surface (but never the tenon) with water and allow it to dry completely. Some hasty people like to dry the wood quickly with a forced-air blower or even propane torch at this point to make any loose fibers stand up immediately in preparation for the next sanding pass. But simply allowing the wood to dry naturally is effective too.

This is an ancient, very effective technique. Please do this at least twice, after which you can apply the finish material.

Kanō Hōgai, Two_Dragons_in_Clouds (1885), ink on paper. Philadelphia Museum of Art. Father and son dragons are depicted playing in the clouds.

The London Finish

There’s a durable wood finishing technique I learned from custom gunstock makers that I wrote about in an earlier article about handplanes called the London Finish. This is the finish I recommend for hammer handles too. It can be as subtle or as flashy as you like.

A pretty handle is nice, but the key objectives for applying a finish to your gennou handle should be (1) to moderate swelling and shrinking of the tenon during seasonal and climactic changes in humidity; and (2) to prevent oil and dirt from penetrating the wood making it look grubby. This matters because such swelling and shrinking can cause the head of your gennou to loosen and do naughty, acrobatic stuff at inconvenient times. And a greasy, dirty handle is no way to treat a friend.

If the head is attached when applying the chemical finish of your choice (I recommend it be so), please tape it well to keep finish off the metal. Apply masking tape to the hammer head on all four sides of the eye, but leave the end of the wooden tenon exposed.

Tape the rest of the head well with masking tape.

Soak the finish material (flat varnish or polyurethane thinned 100% with high-quality thinner) into the eye and the butt as deeply and thoroughly as possible. Plan for three or four applications allowing time for the material to soak in and dry.

Do no use low VOC thinners as they contain politically-correct compounds of water, acetone, emulsifiers and other counterproductive substances the State of California’s poorly-educated but thoroughly-conflicted and richly-corrupt lawyers have determined will save the polar bears, but that will weaken the finish.

If you faceted the butt and want to keep it that way, you must be careful when sanding it or the facets will disappear. This is a matter of personal preference.

Of course, be sure to apply lots of finish to other surfaces of the handle, and wet sand them well as described in the article linked to above. Don’t allow a surface film to dry except for the first time as described in the webpage linked to above.

Hammers are lifelong tools, but too often handles are not. You can help your gennou’s head stay tight longer, stay cleaner, and look better longer by applying a London Finish instead of a thick surface film finish.

YMHOS

If you have questions or would like to learn more about our tools, please use the questions form located immediately below or email us at Covingtonandsons@gmail.com. Please share your insights and comments with everyone in the form located further below labeled “Leave a Reply.” We aren’t evil Google, incompetent facebook, or gossipy X and so won’t sell, share, or profitably “misplace” your information. Promise.

A list of our gennou heads: C&S Tools – Gennou Hammer Head Pricelists & Photos

Previous Posts in The Japanese Gennou Hammer & Handle Series

• Part 1 – Introduction
• Part 2 – Ergonomics
• Part 3 – What is a Gennou?
• Part 4 – The Varieties of Gennou: Kataguchi, Ryoguchi & Daruma
• Part 5 – Kigoroshi
• Part 6 – The Ergonomic Anaya
• Part 7 – The Unblinking Eye
• Part 8 – Head Style & Weight
• Part 9 – Factory vs. Hand-forged Gennou Heads
• Part 10 – Laminated Gennou Heads
• Part 11 – Decorative Gennou Heads
• Part 12 – The Drawing: Part 1/6
• Part 13 – The Drawing: Part 2/6
• Part 14 – The Drawing: Part 3/6
• Part 15 – The Drawing: Part 4/6
• Part 16 – The Drawing: Part 5/6
• Part 17 – The Drawing: Part 6/6
• Part 18 – Wood Selection
• Part 19 – Laying-out the Handle
• Part 20 – Making Sawdust
• Part 21 – Installing the Head
• Part 23 – Finishing the Job