Kumiko Demo

I came across an opportunity to both demonstrate and talk about the traditional Japanese craft of Kumiko at an annual woodworking event. In discussion with a local wood supplier and mill (Wood Source Ottawa, Ont.), they mentioned their upcoming annual open house and how they encouraged local vendors and artisans to participate. I quickly signed up at the opportunity to present and share my passion of Kumiko. Proceeds from the open house silent auction also went to a good cause, so this became another motivation for me to participate. I truly enjoy discussing woodworking and love to engage with people and hopefully motivate them to either start or continue to pursue woodworking.

I had several days to prepare and had sufficient time to create enough Kumiko components to last through the open house. The opportunity also challenged me to devise an innovative way to hold Kumiko guide blocks without having to continually unclamp and clamp the critical guide blocks to a vise. I was able to enlist my Moxon vise along with a small workbench to perform this. The opportunity also provided me the impetus to market a Kumiko Course I had been working on. I could offer the video-based course at the open house! So this all came together and I enjoyed two days at the open house engaging with people and introducing them to the centuries-old traditional Japanese craft of Kumiko.

At first glance, people would be in awe at the small scale of components in Kumiko. Their first reaction was how intimidating and difficult it was to tackle. After engaging and demonstrating the ease of forming and shaping the small interlocking parts, their fears vanished. Often, people need to have a technique presented in a live setting to grasp its intricacies. I get this and can easily relate to this form of learning and visualization. Techniques of safely using a wide chisel to pare wood were also demonstrated, being the core of Kumiko component creation.

I enjoyed the experience and in the process made a few local contacts. Hopefully, I have encouraged a few people to tackle Kumiko and woodworking in general. Working in a solitary studio environment often keeps me from interacting with like-minded people that share a common interest in woodworking. People enjoy sharing their passion and the timing of this open house was ideal since I was between projects and needed a break from my furniture design + making.

Link to  Kumiko Course

Workbench accessories...(Pt. 2)

After completing and successfully testing the portable board jack in the previous post, I decided to continue on with workbench workholding accessories. At this point, two clamping attachments came to mind. The first, an edge dog, alternatively known as a bench puppy, was modelled after a College Of The Redwoods derived design. This particular design was gained from a Timothy Coleman article on this type of workholding device, also derived from a College Of The Redwoods design.

A good example of how an edge dog can be used to hold a board on edge can be seen in the following image. One end is held by a edge dog whereas the other end is an add-on to a twin-screw vise which I discuss next. Instead of clamping a board to the surface of a workbench, the edge dog is used to clamp the board along the workbench edge and therefore at a more reasonable and lower height suitable for handplaning. Having a pair of these edge dogs allows either side of the workbench to be used. The edge dogs are created with opposing configurations as shown above.

My current workbenches do not incorporate dedicated tail vises. In place, I use a Veritas Twin-screw vise which performs as a tail vise when clamping boards on their face. When it comes to clamping boards on edge, the twin-screw vise can also be used along with bench dogs. The edge of the work piece would be then sitting on the workbench top. However, this raises the height of the board considerably and is not very conducive to jointing an edge of a board or handplaning. Ideally, the edge of a board should be slightly higher than the workbench surface to effectively perform hand plane operations. With this in mind, I created this outboard add-on to the twin-screw vise which extends the width of the vise movable jaw past the edge of the workbench.

Shown above, this newly designed outboard add-on accessory is an addition to the twin-screw movable jaw. In effect, the twin screw vise now becomes an enhanced tail vise capable of clamping boards on edge along the side of a workbench. The clamping is done in conjunction with the previously mentioned edge dog. Images of a board being clamped between these two accessories are shown below.

In these photos I am jointing the edge of a white ash board. I was surprised at how tightly the board is clamped with minimal tension applied to the twin screw vise. The friction from the leather pads contribute to this as slightly more tension was necessary before applying the leather pads. The outboard extension to the twin-screw vise is removable and can be adapted to either side of the twin-screw vise. I am left-handed so having it located to the right of the vise as shown, is more practical. For right-handed use, the opposite edge of the workbench would be used for jointing. As an added bonus, there is no racking of the twin-screw vise regardless of the clamping pressure I apply to the outboard extension.

Moxon vise build...(Pt. 2)

The Moxon vise build continued and the vise was completed a couple of days after beginning the project. There was a considerable delay in determining the optimum length of the vise. This actually held me back since making it too short is essentially non-correctable later. Too long and there is a weight penalty as these Moxon vises tend to be heavy, especially with the Benchcrafted solid iron handwheels. Although the extra mass and weight can be your friend when clamping boards down, portability of the unit is also a consideration. I would need to determine the size of panels I most often worked with. In my work, I never go over about 20 inches in width so I set this as optimal distance between the screws. Then, using guidelines on screw hole placement provided in the Benchcrafted instructions, a final length of 28 inches was decided on. I did follow the suggested screw hole placement in the Benchcrafted instructions, this saved some time. Next was to mark the 3/4 inch screw holes and begin drilling, careful to have the holes in the front and rear jaws perfectly aligned.

Mortising for the captive nut in the rear jaw inside face was performed using bevel-edge and mortise chisels. Hard maple is well.. hard! In this case, the mortise chisels excelled at hogging out material from the 3/4 inch deep mortise. With a softer hardwood, lighter bevel-edge chisels would have been sufficient. I also oriented the nut so it would align well with the long edges of the rear jaw, mostly an aesthetic consideration. 

After test-fitting the Benchcrafted hardware and ensuring it worked smoothly, the next step was to attach a large block of wood to the rear. This block of wood would both stabilize the vise assembly and allow holdfasts to be used to clamp the Moxon vise to the workbench top. Several other intermediate steps were performed, always careful to get alignments exactly correct. There is almost no room for error in making these vises since replacing either of the jaws is both time and material consuming. A more comprehensive article on how I made this Moxon vise will be available at the web site soon.  

A table extension and vertical support was then added after ensuring the stabilizer was effective at clamping down the Moxon vise to the workbench. The table allows me to extend horizontal boards for marking..i.e. dovetails. I customized the design to use an extra row of dog holes in the center area of my workbench. I have two of these workbenches set as my primary workbenches, so the Moxon vise will be completely portable between benches. The vise can also be located almost anywhere on the workbench surface as the holdfast locations are optimized to clamp the stabilizer block of wood at rear of the vise. I am using Gramercy holdfasts but any holdfasts can be set up for use with the vise.

More detail of the handwheel, screw, and captive nut can be seen above. The table is reinforced below both long edges for maximum support, this to allow for any mallet work. i.e. chopping out dovetails. A large design consideration was to not make the Moxon vise too heavy as I would often be removing it from the workbench top and/or moving it between workbenches. The table size was optimized for this vise and the type of work I do. When designing your own Moxon vise, you will need to determine the size of boards and panels you most often work with. The overall length of the Moxon vise is the most important consideration in its design, it is best to get it right the first time!

A more in-depth article on how I made this Moxon vise will be available at the WoodSkills web site soon. 

Moxon vise build...(Pt. 1)

So I decided to build myself a Moxon vise over the holidays. Business slowed and I had the time to get going on this project. A Moxon vise was something on my mind for quite some time, it was simply a case of finding time to make it. Some time was spent on research to determine which version best suited my work methods. It is essentially a straightforward build, but critical to get it right to ensure the time and material investment is put to good use.

I'm not 100% sure of the origins of the Moxon vise design, but it is widely attributed to Joseph Moxon. Joseph Moxon (8 August 1627 – February 1691), hydrographer to Charles II English printer specialising in mathematical books and maps. Moxon's 17th century book. The Art of Joinery first described the double-screw vise. In this historical publication was documented the Moxon vise - a double-screw held to a workbench top with clamps or holdfasts in order to facilitate certain work.

The main criteria for me was to be able to hold work above the standard height of a workbench. Rather than piece together the hardware for the vise itself, I opted for the Benchcrafted Moxon Vise hardware kit as it includes everything mechanical. I would need to supply the wood and shape the vise jaws (chops). This would be for the basic vise. A more complex version with an additional work table behind the vise would involve several more steps. The overall length of the Moxon vise has yet to be decided on, but will be in the 28 to 32 in. range.

So after deliberating on the design, I simply went at it and worked on the front and rear jaws. Not having 8/4 stock available to me, I opted to laminate some 4/4 maple pieces instead. In the past, I have had success with the strength and stability of 4/4 boards laminated together. In selecting the boards, I mixed the grain orientations up so each of the laminated boards would counter the grain of the other board. This, in my opinion, balances out the internal stresses of the woods and keeps it all straight and stable. Laminating one of the jaws here with 4/4 boards. As they say, one never has enough clamps. In the pic below, this was almost the case, but it worked out. I do have other clamps, but for the most part, they are lighter. To be continued...