Covington & Sons

 

Woodworking minus patience equals firewood. 

– Author Unknown

In the previous article in this series, we selected and prepared the wood for our gennou handle and layed-it out in accordance with our design drawings.

The next step in the process is to gather our tools and begin the fun work of making sawdust.  Yeeehaaaa!

Tools

I prefer to use the following tools when making a gennou handle. You will need to have similar tools on hand for layout and fabrication, but the specific choice is entirely yours. 

1. Divider with sharp points (transferring dimensions and tenon layout); 
2. Sharp pencil (making pencil marks (ツ); 
3. Small try square (laying out and checking tenon); 
4. Marking gauges (Titemark and kama kebiki. Marking tenon and centerlines) ; 
5. Marking knife (layout); 
6. Rip handsaw for roughing out; 
7. Hozohiki rip saw and/or dozuki crosscut saw and/or rip saw for cutting the tenon (in hardwood, a sharp hozohiki rip saw frequently makes both rip cuts and crosscuts cleaner and more precisely than a crosscut dozuki saw);
8. A fine saw such as a fret saw or coping saw with a fine blade for making curved cuts;
9. Auriou cabinet rasp (Lie-Nielson) (optional); 
10. Bogg-pattern flat-sole spokeshave (Lie-Nielson) (optional but really handy);
11. Sandpaper; 
12. Satin Polyurethane finish (optional); 
13. Mineral spirits (optional.
14. A board to support the handle-in-progess. I suggest dimensions of 300-400mm long x 50-60mm wide x 40-50mm thick, with a “V” groove cut full-length and a cross-stop inlet about 2/3 its length. The handle will rest, more-or-less securely in this groove, and be restrained at one end by the stop when using spokeshaves and rasps. This support board can be clamped in a vise, or clamped to a workbench with a C clamp. I also find it most efficient to place this board on my benchtop with the gennou handle resting in the v-groove with one end touching my chest, perhaps cushioned by a rag, and use rasps and spokeshaves pulled towards me to shape the wood.

The Tenon and the Unblinking Eye 

Let’s start by cutting the tenon and fitting it to the gennou head’s eye. 

You’ve already layed-out the tenon, so use a fine precision rip saw like or 210mm hozohiki to cut the four cheeks being extremely careful, like a big-eyed kitten stalking a grasshopper, to stop short of the layout line. Be careful to work very precisely with your saw to not cut too deeply as any excess meat removed from the tenon, or sawcuts left in the tenon, will fatally weaken it. I’m not kidding!

I’ve made this mistake more than once, ruining all my work to that point and wasting some nice wood. Indeed, it may be best to cut the shoulders shallow and trim with a chisel, once again being careful to not cut too deeply. Ruthless, merciless, unrelenting control of your naughty inner-badger is critical!

At this point, the handle is a chunky, graceless block with square edges and flat surfaces. That’s alright. There’s no need to contour the handle yet.

Cut itsy-bitsy teeny-weeny chamfers on the end of the tenon to help guide it into the eye without cocking and binding. A big chamfer will benefit nothing and look ghastly.

Mark the reference face annotation on the corresponding tenon cheek because you don’t want to mistakenly force the tenon in bassackwards.

Test fit the tenon into the eye a few millimeters but without driving it all the way on. It should not start by hand pressure. 

Although you shouldn’t have to try tried a full-power test fit, when you are satisfied that the tenon will fit into the eye of your gennou head without the driving forces shaving off much wood, and marked the reference faces, then tape the tenon with masking tape so you don’t accidentally knick or shave it. Don’t ask me why I know this risk exists.

With the tenon close to completion, let’s next shape the curved front, back and side surfaces to fit.

The Back and Front Edges 

Cut the back and front edges (surfaces parallel with the long axis of your gennou head) to your design profile using saws, rasps and/or spokeshaves. The two guiding details in this process are the butt and the tenon, with the tenon being most important. These two surfaces should be shaped to smoothly connect the butt with the tenon, not the other way around.

However, leave the corners square for now to help guide you in shaping the critical back and side surfaces because, if you start rounding and smoothing edges and corners now, it often happens that the geometry which aligns the hammer’s face with chisel and nail will be compromised.

The tools you use don’t matter so long as when this step is complete the back edge is perpendicular to the reference face, the opposing side face, and is consistent with the layout lines. 

I recommend you cut outside the layout lines plus a millimeter or two because accidentally cutting deeper than your layout lines will not only disrupt the even flow of the design but may damage the structural integrity of this elegant, minimalist tool. 

Do not cut or shave the handle’s sides flush with the tenon yet, but leave them just a hair proud. 

When done with the this, lightly remark the centerline and extended the eye’s lines. 

The Sides 

At this point in the process the right and left sides should still be flat and parallel, perpendicular at any point with the back surface, and have neat, square corners.

Use the paper/cardboard profile pattern from your design drawing to mark the handle’s layout on the back and front edges. 

Just as with the back and front edges, cut the side surfaces using saws, a drawknife, rasps and/or spokeshaves.

The transition from tenon to butt should be uniform and smooth. As you approach the final dimensions, be careful to avoid tearout or gouging in the neck area since removing these irregularities may require you to reduce thickness too much. 

Do not cut or shave the sides flush with the tenon’s cheeks yet, but leave them just a hair proud. 

Smoothing and Rounding 

I find it most effective to leave the back edge (opposite the flat striking surface of the head) flat with slighty relieved corners. Some people like to make the back edge of the handle oval or egg-shaped, but I recommend you leave it flat at first and then adjust it to fit your hand as you use the gennou. 

Common sense will scream at you in a voice like a nazgul to round the the back surface or to make it oval-shaped, but while such surfaces might look better hanging on a peg in a hardware store, or feel better when using your hammer to kill coackroaches, it is counterproductive when doing serious work, I promise you.

Why? Because, despite what you may think, a flatter back surface does not bite into the hand in-use, but because of the greater surface area in contact with the hand it provides, actually reduces the pressure of impact reaction forces on the hand reducing fatigue and bruising. More importantly, it helps with quickly and unconsciously indexing the striking face of the head correctly.

With the back edge where it needs to be, next round the front edge into the design profile. I prefer this surface to be more-or-less a perfect radius at any point in the handle area, but some guys feel an egg-shaped cross-section fits their fingers better. Six of one half-dozen of the other.

In any case, this surface must smoothly morph into a flat surface with slightly radiused corners in the neck area, and finally with no radius as it approaches the tenon. Yes, you read correctly: no radius.

I usually round-over the flat on the back edge right where my index finger wraps around to the side just a little to avoid developing a blister. But keep in mind that the only way to tell what small details works best for you is trial and error. 

Doming the Butt 

The butt should be flat with sharp edges at this point in the process. 

You may find a domed butt strange, but it has both a practical purpose and an aesthetical one.

Let’s consider the structural, practical purpose first. If the wood is adequately hard, and the tenon is not too skinny, you will need to hammer the butt like a son-of-a-gun dozens of times to get the tenon into the eye. Don’t start yet, but when the time comes you must be careful with the direction of your hammer strikes to avoid breaking the tenon.

If the butt is flat with crisp edges, unless you have perfect aim with every swing, your hammer might chip or even split the butt. A domed surface directs impact forces away from the edges of the butt and into the neck, helping to prevent chipping. Likewise, a curved butt will also reduce damage to the handle over many years of hard service.

With regards to aesthetics, a domed surface is more organic and, to my sensibilities, more elegant than a flat one because straight lines seldom exist in nature, are boring to the eye, and seldom please it.

A warning. Everyone has different opinions about what pleases the eye, as you know. Beauty is in the eye of the bean holder, or something like that, so I entirely understand if you dismiss the aesthetic reasons I’ve suggested. But please don’t ignore the practical, structural reasons if you want to avoid wasting your time and wood.

Assuming the butt is flat and its surface is more or less perpendicular to handle’s centerline, use a marking gauge set at ¼” to scribe a shallow line along the handle’s edges and sides. Lightly scratch another shallow line the same distance around the perimeter of the butt. These lines will be the limit of the chamfer between the grip and the butt. 

Next, mark a cross on the butt using the front and back edge’s centerline, and a perpendicular line parallel to the back edge. This cross will be useful in profiling the butt. 

Use a knife, chamfer plane, block plane, files or other tools to chamfer to the lines just scratched.

Next facet the butt using planes or a sharp kiridashi kogatana knife and remove all tearout and filemarks. The time for using sandpaper will come later in this adventure when we apply finish. 

Fixing a Loose Head

So here’s the “I toljaso” in advance.

If you were not a clever little big-eyed kitten when fitting the tenon, you may find the tenon becomes loose and the head begins to wiggle with the passing of a few seasons. A Sergent Elias moment!

I won’t say it out loud, but just between you and me and CCP you can remedy a loose head by removing it and shimming the eye with quality high-rag-content typing paper. Don’t have any such paper in your bat cave? Don’t tell the Secret Service I said so, but a strip cut from a dollar bill works best. Crane Stationary makes the best paper in the world.

In the next post in this series we will attach the gennou head to the handle.

Until then, I have the honor to remain,

YMHOS

Lena Dances With the Knight by John Bauer 1915

If you have questions or would like to learn more about our tools, please use the questions form located immediately below. To see a list of our tools and their pricing, or to contact us, please click the “Pricelist” link here or at the top of this page.

Please share your insights and comments with all Gentle Readers in the form located further below labeled “Leave a Reply.”

We see data miners and their bots as dastardly sneak thieves and so promise to never share, sell or profitably “misplace” your information for any reason. If I lie may the heads of all my eyes become egg-shaped!

Previous Articles in The Japanese Gennou & 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

Not all those who wander are lost.” 

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

 

Introduction 

In previous articles in this frightfully sexually-charged series, Beloved Customer produced a design drawing for your gennou handle based on the parameters of your actual gennou head and your body. You should have also selected, or at least rolled out of bed onto the floor, opened on eye, and seriously considered, an appropriate stick of wood. Assuming you’ve procured said stick, let’s get to the layout. 

Tools 

There are as many ways to layout the shape of a hammer handle as Carter has pills. I won’t tell you how to do it or what tools to use, but after making dozens of gennou, hammer, and axe handles for myself and customers, I prefer to use the following tools. You will need to have a similar set of tools on hand for layout and fabrication. 

1. Divider with sharp points; 
2. Sharp pencil; 
3. Small try square; 
4. Marking gauges (Titemark and kama kebiki); 
5. Marking knife; 
6. Rip and crosscut handsaws for roughing out; 
7. Handplanes for creating the flat sides and edges in preparation for layout;
8. Dozuki crosscut and/or rip saw for cutting the tenon;
9. Auriou cabinet rasp (Lie-Nielson); 
10. Bogg-pattern flat-sole spokeshave (Lie-Nielson); 
11. Bogg-pattern curved-sole spokeshave (Lie-Nielson); 
12. Sandpaper; 
13. Satin Polyurethane finish; 
14. Mineral spirits. 

Can you get by with fewer tools? Of course. A pencil, handsaw, hammer, marking gauge, dividers, and pocket knife are a minimum set. Will this minimalist set take more time, produce more blisters, prove frustrating, and produce an inferior handle? Absolutely yes. But it can get the job done.

Layout 

Select a board or stick with dimensions a little greater than the length, height, width, and thickness of your handle design, with 6 flat, parallel, square sides. 

You can prep this board or stick using electrical tools, but if you can’t do it with handtools alone, I strongly encourage you to work on your basic skills. In this age, surprisingly few have these skills.

Looking back on the old texts, one of the first tasks assigned trainees in cabinetmaking technical schools and apprenticeships was making a number of sticks or boards like this because this job combines many of the essential tools skill while developing an understanding of the material. I can attest to the bullet-proof validity of this concept.

1. Begin your layout by selecting and marking a flat and wind-free side of the selected board corresponding to a profile view on the drawing to be the “reference face.” Don’t forget to label this critical surface somehow so there will be no confusion moving forward.
2. Plane the surface of the board that will form the handle’s back edge (seen from above in plan view) flat and perpendicular to this reference face. All further layout will be indexed from these two faces. 
3. Mark the maximum thickness of the handle on the surface opposite the reference face, as determined by the widest dimension of the butt, using a marking gauge against the reference face.
4. Plane all the surfaces flat, free of wind, and where appropriate, planar. This needs to be done pretty precisely.
5. Use a marking gauge to draw the appropriate centerlines on both sides, edges, ends of the board/stick.
6. Use dividers to measure and layout the width of the eye, centered on the centerline you just marked, and spin this around the eye, butt, back edge and front edge. 
7. Make paper, cardboard, or wood patterns based on your design drawing of the handle’s elevation and profile views. Paying close attention to minimize grain runout, especially in the tenon and neck area, position the patterns and mark the board. 
8. Using these cardboard patterns, carefully layout all the tenon’s dimensions on the board, measured from the reference face and back edge. Be sure to make the tenon a half-sheet of copy paper too large in width and thickness. This can be trimmed down later if the fit is too tight. 
9. Adjust the lines of the handle design to meet your requirements for beauty.

In the next post in this series we will begin making sawdust. Oh joy!

YMHOS

Two Trolls by John Bauer, 1909. Not wanting to pay for the bread oven your humble servant has just installed, Granny Troll is trying to convince me to climb inside and do a closeup inspection. Will I fit? Do you like my fetching new shoes?

If you have questions or would like to learn more about our tools, please use the questions form located immediately below. To see a list of our tools and their pricing, or to contact us, please click the “Pricelist” link here or at the top of this page.

Please share your insights and comments with all Gentle Readers in the form located further below labeled “Leave a Reply.”

We see data miners and their bots as dastardly sneak thieves and so promise to never share, sell or profitably “misplace” your information for any reason. If I lie may the heads of all my hammers fly away to Valinor!

Previous Posts in The Japanese Gennou & 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

Torre Civica in Assisi, Italy

I’m not only a philosopher, sir, I’m a fatalist. Somewhere, sometime, there may be the right bullet or the wrong bottle waiting for Josiah Boone. Why worry about when or where?

Doctor Josiah Boone, Stagecoach, 1939

This series of articles is about tools that have been around a long time, used by nearly every craftsman and builder throughout the span of human existence. Tools without batteries, with no plastic parts, with no need to update or replace glitchy decepticon software that intentionally breaks or evaporates after a few months. These are tools that don’t lend themselves to mass-production and corporate profits. You could even make them yourself with little effort.

I call them “Ancient Tools” because their origins are older than writing.

In this post, your humble servant would like to consider two of the most ancient such tools: the noble stringline and its stiffer brother: the straight edge. We will also touch on the divider.

But before we go into details, let’s consider some background about these tools and why they are so important.

Some History

It’s not even a featherweight of exaggeration to say that each of these tools was essential to the design, fabrication and installation of the wood, brick, stone and steel that make up the foundation of both ancient and modern human civilization.

Indeed, beyond simply making stuff, these small tools were critical to the elevation of human civilization above subsistence hunting, gathering, and the herding of goats. How did these simple tools build civilization, Gentle Reader may ask?

Well the reasons are simply that the stringline and straightedge were essential to the development of mathematics, geometry, trigonometry, navigation, astronomy, architecture, engineering, external ballistics, and many other practical sciences, all of which are essential to not only craftsmen, but modern civilization in total. An exaggeration? Not in the least degree.

Does Gentle Reader use round objects? How do you think the number Pi was first approximated? 

Does Gentle Reader ever ride ships on oceans, or airplanes in the sky? Or use objects transported by trains, cars or trucks over long railways and highways? Have you given thought to how ancient builders were able to plan and layout those railways, roads and highways? Or layout and cut the earth, stones and wood to make them?

Have you considered how ancient sailing vessels were able to navigate oceans and chart constantly changing courses?

You may think that these tasks are all handled by theodolites, lasers, computers and GPS widgets nowadays, and that may be so, but it was the string line and straightedge that started it all.

It’s my humble contention that these simple tools remain of significant utility even to modern woodworkers.

Relevant History

Pardon me while I momentarily wax academic.

Did you know that the oldest and most respected treatise on geometry was a 13 book collection titled Elements of Geometry, written around 300 BC by the Greek mathematician, Euclid? That was along time ago.

A fragment of Euclid’s Elements on part of the Oxyrhynchus papyri.

The fact is that Elements is the world’s oldest, extant, large-scale deductive treatment of mathematics, and for nearly two thousand years was the definitive document studied in the West and Middle East by those seeking an education about the physical world. This includes, of course, Leonardo of Pisa (Fibonacci) (c. 1170–1250 CE), René Descartes (1596–1650), Sir Isaac Newton (1642–1727), and every other mathematical giant. It’s an impressive set of books by any standard.

Of course, Maestro Euclid did not invent all the principles presented in his books but summarized the works of Eudoxus of Cnidus, Hippocrates of Chios, Thales and Theaetetus.

The exact same principles of mathematics and geometry written about in the Elements are taught in schools and universities nowadays, although the textbooks employed are abbreviated, fancier, plagiarized versions of the Elements shamefully giving no credit to Maestro Euclid or his teachers. Interestingly, the word plagiarize comes from the Latin word plagium, meaning to kidnap.

And here’s why The Elements is relevant to this humble scribble, because, you see, Euclid limited the constructions he presented in his books to those that could be produced using just a simple straight edge (not a ruler) and a basic divider, the two most important tools to civilization, and worthy of mastery.

Let’s first examine the father of the straightedge and ruler: the string line.

The Stringline

Before the straightedge there was the string line, a simple tool older than the straightedge, the ruler and the divider. Anyone can make one.

Think about it. If you must draw a straight line, or check that something is straight, and you lack a precision straightedge or carpenter’s square, or the tools you have are too short, how would you do it? The quickest, cheapest, most reliable tool for the job is the simple string line, be it made from palm fiber, camel hair, hemp, nettles or dried fish guts. Anyone can make it, and anyone can use it. They sell it at Home Despot, but batteries are not required!

The same string line can also be used as a divider or compass.

For example, if you need to divide a distance into 4 segments, simply stretch the line over the total distance and fold it back on itself 3 times. Each fold is a perfect 1/4 division of the total distance. This may be the origin of the 1/2″, 1/4″, 1/8″, 1/16″ progressions of divisions used in imperial measurements.

If we tie a knot, or make an ink mark at each of these divisions, we’ve now made a very accurate, graduated string line which can be used like a tape measure. And all it took was just some cordage made from a nettle plant or horse tail. Batteries not included.

A commercially-available string line I recently purchased for quality control of a robotic customer fulfillment center construction project in Chiba, Japan. In Japan this tool is called a “mizuito” (水糸), which translates to “water string.” In Japan the “water line” has nothing to do with boats but is a datum line critical to layout in construction, BTW. Made by Takumi in 4 colors, this string line is made of 0.8mm x 120m low-stretch nylon. Stretchy nylon would be a big failure. The black plastic reel that came with it measures 80×52×31mm and comes in both 120m and 240m sizes and is designed to fit into a breast pocket. To use this reel, one places one’s thumb and forefinger on the opposing free-wheeling red circular centers on each edge of the reel. This allows one to completely control the reel with just two fingers while spooling line in or out and all without striking the web of the hand. A very handy tool indeed and one I use all the time.

The Straightedge

The straightedge is a stiffer, shorter, handier version of the string line. It takes some skill to make.

The ruler is a straightedge with marks (graduations) instead of knots. This takes more skill to make.

The folding rule and metal ruler are more durable, convenient versions of the wooden ruler, but take a lot of skill and expensive materials to make. They were too costly for ordinary craftsman to own until recent times.

Public Standards of Measurement

In ancient times, each upstanding, well-organized community, be it town, city, abbey, temple, or castle, had a person responsible for establishing local legal standards of weights and distances, for maintaining official references materials (e.g. actual weights, graduated rulers or containers), and for checking on behalf of the local authorities, such as the Pharaoh, king, baron, castle owner, abbot or mayor, that the subordinate members of the community were in compliance with those standards.

In past millennia this system of public standards was considered proof of civilization, one of the primary justifications for government and taxes, while the lack thereof was considered a sure sign of barbarism and crooked government.

Indeed, failure to establish, maintain and enforce these standards frequently resulted in bitter disputes and even bloody wars in the not too distant past.

With every Tom, Dick and Pharaoh striving madly to become emperor of the world and establish themself in history forever as the person who governs “standards” (aka the “ruler”), until relatively recently, these weights and measures varied from kingdom to kingdom, castle to castle, and town to town. What a confusing mess!

Matters of health, welfare and uniform commerce aside, from the days of Melchizedek, standards were, and still remain, absolutely essential to taxation, of course.

To ensure that buyers and vendors were familiar with the standard measures current in a certain place, in ancient times these standards were carved onto or embedded into the walls of public buildings and church facades in such a way that all could see and copy them, and so they could not be removed or defaced.

Defacing/modifying standards, sometimes by the taxed and often by those imposing taxes, has always been a convenient but ruinous way to make money. The recent bout of intentional high inflation and currency devaluation the world is experiencing is a symptom of currency adulteration, another ancient criminal activity related to defacement of standards.

Indeed failure to comply with officially-established standards was deemed a serious offense in many communities punishable by fines, imprisonment, dunking, public exposure, dismemberment, hanging and even crucifixion. Worldwide more than a few shopkeepers, bakers, brewers, weavers and even tile makers were maimed or executed for “shorting” their customers.

Historically, master builders and tool makers were often required to provide a letter from the local standards officer attesting that their measuring tools were in full accord with the latest standards.

While we no longer embed standards of measure made of iron or stone in the walls of churches and city halls, in one form or another, this practice continues even today.

Standard measures on the façade of the Torre Civica in Assisi (photograph Elizabeth den Hartog). Shown are public standards for various units of length at the time (yard, foot and palm), as well as the respective official standards for the thickness and size of roof tiles, bricks and floor tiles. These standards often included the minimum size of a loaf of bread and size of a tankard of ale.

How To Use a Straightedge

I learned how to use straightedges, scales, dividers and compasses for carpentry and woodworking as a boy from my father, and from carpenters and other craftsman on jobsites over the years. But I learned the most from drafting classes in college. This was before drafting heads, digital protractors, dot-matrix printers, and CAD. Back then even lettering was done by hand or using plastic/metal templates. The professors back then were justifiably proud of their hard-earned skills and the beautiful and precise documents they could deftly produce entirely by hand.

The first lesson the Masters taught was this: Never lay one’s tape measure, rule or scale on the drawing/workpiece and mark from it directly using pencil, pen, scribe or marking knife, but instead use dividers to first measure the required distance on the scale/ruler, indexing the divider’s points in the engraved lines, and then use those same dividers to transfer and mark the distance onto the workpiece or paper. High precision indeed.

The intuitive, but inefficient way most careful people do the job is lay the ruler, yardstick or tape measure on the workpiece, index one end (a careful man will always “burn” 1″ or 12″ or 10mm and not index directly on the tool’s end), locate the target distance on the measuring tool, and make a mark. But if he is trying to layout an irregular distance like 2-3/64″ (= 52 (51.99) mm), for instance, a pencil’s lead or pen’s tip is too wide for precision, so he will use a scribe or marking knife instead. But in many cases, this requires extremely good eyesight, and sometimes even a magnifying glass. When I as a young man, many senior carpenters kept a magnifying glass in their toolbox. It works.

The wiser craftsman will tip the scale or ruler on its edge, kneel or bend down so he can see the scale’s/ruler’s marks clearly, fit the point of his marking knife or scribe into the engraved line on scale/ruler, and then transfer that to the workpiece, paper, or story stick with a quick “tick.”

There is a risk that the far end of the ruler/scale at the point he is measuring from may wiggle out of alignment messing up his precision. Or that the scribe/knife point may shift while making the “tick.” With practice, these tendencies can be overcome, but clearly this method is time consuming and the results may be questionable.

The improvements I recommend to make one’s marking knife more effective at this task can be seen here.

But using dividers, the wise craftsman can fit/index their points quickly and precisely into the engraved lines in scale/ruler at each end of the measurement, first time everytime, and without kneeling, squinting, pressing down, or worrying about wiggling and shifting mark the desired distance on the workpiece. Once he has set the dividers to the required distance, he can fit one of the sharp points precisely into the index hole, or onto the line he is measuring from, and then use the other point to make a precise scratch or hole in the workpiece, which can be used again for future layout reference. This technique greatly improves precision without using a magnifying glass.

This technique works with both dividers and trammel heads.

Standard dividers are quickest, but a locking divider with screw adjustment is easier to adjust precisely and is more likely to retain the measured distance with repeated usage.

You will find when drafting or doing layout that you repeat some distances frequently. Having 2 or 3 locking dividers set to these distances close at hand will allow you to layout those distances quickly and accurately without the need to refer to scale/ruler. Your humble servant keeps three in my toolchest.

The quality of your scale/ruler becomes important when attempting precision layout. A high-quality, professional-grade scale or ruler must of course be of proper length and uniform width and thickness, be free of twist, and have accurate lines. But to qualify as a high-quality scale/ruler, it must pass 2 simple quality tests, not an easy task nowadays. 

1. Accurately spaced graduations. Performing this quality check requires the skillful use of precision tools and time, so it is seldom economical to purchase discount scales/rulers.
2. Consistently engraved graduations. Besides being spaced at the right distances, the graduations engraved into the metal must be the right length, width, depth and have smooth, straight walls. This too is also uncommon. Don’t settle for cheapo tools with shallow, uneven laser-etched or acid etched graduations. Photo-engraved graduations are best. Seldom found in Chinese or Indian tools.

We’ll consider more uses for these tools in the next installment of this crazy adventure.

YMHOS

A fusuma screen by Kano Nagatoku, a designated National Treasure of Japan, commissioned by the Tokugawa clan, Japan’s last and most famous shogunate. Imagine presiding over a meeting with this as your background!

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.

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 raunchy Reddit and so won’t sell, share, or profitably “misplace” your information. If I lie may my straightedge warp and my string lines all break!