Origami Chair

This past autumn I was commissioned to build a chair by a student in the Chair Design class I was co-teaching with Jeff Miller at the Center for Furniture Craftsmanship. During the brainstorming / model making / getting creative energy flowing exercise the student (Jed) came up with a captivating model by "simply" folding paper together into the form of a chair. I wish I had decent pictures of the model, but let me tell you, Jeff and I were both immediately drawn to this concept and the potential it had. After a day or two of head scratching our collective brain power was getting pretty mushy, Jed's chair was redesigned capturing some of the elegant lines the model had into a design Jeff, Jed and I were confident in Jed being able to build in just over a weeks time. By the end of the class Jed had created a striking, sit able chair, but he longed to see that original folded together model come to life. Jed commissioned me to make the original design, the endeavour took on a new life.

I knew I had gotten myself into a pretty hefty challenge, but let me tell you, I greatly underestimated what lay ahead. Fold some veneer here, fold some veneer there, voila, chair. I knew it was going to be labour intensive, but what I did not anticipate was the mathematician level of trigonometry / master origami problem that lay before me.

I started in my sketchbook (like always) and came up with a few reiterations of the chair I was content with and started trying to decipher just how to build one of them. After more head scratching I realized I was chasing the wrong concept altogether, and that in reality I wasn't pleased with any of the three concepts I was initially working on. I was trying to merge Jed's original model, his finished redesigned chair and something I thought would be comfortable into a pretty little package. I had ended up in a place with a chair that lacked a cohesive look and feel, I reached out to Jed wanting to discuss the project with him. Jed had no interest in seeing and adding input on the designs, he wanted me to find the right design for myself, to look past the hangups and let my voice be heard. It was a deflating and empowering moment all at once. I took a long walk, enjoyed some fresh air, and realized I needed to go back to the start. I got out the paper, and for what seemed like days folded together both model sized and full sized chairs. From here my current concept was born. I ended up straying a bit from the original model Jed had folded together back in September, but have found a direction I believe will lead to a very unified, refined looking piece.

The plan is to make the chair out of just two parts, seems easy enough right? The first part will be a bent panel that makes up the back rest, arm rests, and back legs of the chair. The second part will be a bent panel that makes up the front legs, seat, and another set of back legs. The two panels will then be joined (glued and bolted) up the back leg. Both panels will be pressed out of commercial veneer with alternating grain direction to essential be shop made plywood, this way it will be strong and stable. There will be relief cuts in the veneer to allow for the panels to split apart (top of the back rest and front of the seat) where the panels change the plane they are being bent on.

Pictured below are a few (of what seems like hundreds at this point) of my mockups. They are cut from paper, cardboard, and one version made out of plywood to get something rigid enough to take angles from and sit in to work through ergonomics.

I know it doesn't seem like much yet, but stay tuned, this will be a learning intensive journey for everyone involved.

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Dining Table No.1 Finds Its Home

Dining Table No. 1 has arrived in its new home. I was enormously nervous while delivering this table, I was unsure of how stable the table would be but was very pleasantly surprised to find I could actually sit on the outer edge of the glass without the table so much as budging. Relief. The current piece of glass is from the clients old dining table, they plan on purchasing a longer piece of glass that may have some shape to it. I will professional photograph it once the real top has arrived.

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Removing Water Stains

The slats have all been fit on Dining Table No. 1. After having steamed and twisted the 66 white oak slats they had a lot of water stains on the slats. The water stains were on the slats when they came out of the steam box, I can't say for sure why but my hunch is I didn't have them spaced out enough and/or condensation was dripping down onto the slats throughout the steaming process. In most cases I wouldn't worry to much about it, just scrape and sand until clear. However the design called for the outside face of the slats to have  a bandsawn texture, this meant I was going to have to find another way of removing the water stains.

Some internet searching led me to find an organic compound solution, oxalic acid, which is a poison found in rhubarb. I ended up in what I can only best describe as a mad laboratory studio in the east end of Toronto where I purchased a 100g of the powder. Mixed roughly 10 parts water to 1 part Oxalic Acid I began scrubbing away at the stains with a wire brush. The test proved semi successful, although the stains were mostly gone the colour in the wood went with it leaving a sort of washed out dirty bleached look. It was undesirable for the finish I was looking to attain and meant going back to the drawing board.

Oxalic Acid

With no real explanation as to why I thought it would work I decided to try and steam the stains out (last resort). Armed with my second hand iron and a wet clean rag I began steaming the water stained spots. Much to my disbelief the stains were lifting right out of the wood and actually transferring onto the rag. Some of the darkest spots took a couple tries but in the end I was left with clean (and wrinkle free) slats. I prepped them for finish by using the wire brush in line with the bandsaw marks to clean the slats and sanded a small chamfer on the edges. Few coats of wipe-on-poly later and I couldn't be happier. As much as I had fun with my brief organic compound trial, I am thrilled that steam was the solution. Be it bending, twisting, fixing dents or removing water stains, steam is the trick.

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Drawing and Erasing, and Erasing

This week I have spent a bit of time sketching Coffee Table No. 1  for a new client who is looking to commission the same table, just bigger, and rectangular.  In order to work through the design in my own brain and determine pricing I needed to work out the piece in scale on paper. The top view and side view of the table are done to scale and are more for my benefit, the perspective drawing is to scale as best as my eye could accomplish and is more so there to give the client an idea of what the piece will look like. Drawing is something that always takes me a long time. There is a lot of layout and erasing that happens, a LOT of erasing. It is something that I am constantly improving at, for the sake of reference I have the perspective drawing from the original coffee table design that I sold a different client this time last year. Gives you a bit of insight into how my drawing abilities have progressed in even just this last year.

As my aesthetic develops into designing pieces using lots of parts to achieve an overall greater form I wonder if my time might be better spent learning how to design on a computer. At the end of the day I just enjoy drawing by hand, probably for the same reasons I enjoy making furniture by hand. Not to mention I think there is something kind of special nowadays about showing up to a clients home with a sketchbook and a pencil to show them concepts rather then a laptop.

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66 Slats / 198 Fasteners

With the white oak slats twisted into shape and drying it was time to layout exactly where each slat was going to attach to the frame and drill holes in the steel frame for where the fasteners would go. It took a few tries to get the spacing right with the dividers, a centreline was scribed and the holes were set with a punch and hammer. The steel base was clamped down to the bed and using a jig that held the drill parallel to the bed 198 holes were drilled through the 3/16" thick steel. 37.25" of lineal steel were drilled through over the course of two days. As the 66 wood slats got fit into place the same drill jig was used to drill out the wood slats for the fasteners.

 

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Magical Metal Work

After a bit of a delay we're back on to the metal dining table with the twisted white oak slats. I know there have already been pictures of the twisted slats and a video of us "getting our twist on,"  but we're going to take a step back on this post. Below are pictures of the metal frame I had fabricated which will hold (frame) 66 twisted white oak slats. In order for the frame to properly hold the twisted wood slats it also requires the metal angle iron to twist from acute to obtuse back to acute, or vice-versa. This is also happening along a curve, two curves actually.

So, in order to ensure as much accuracy as possible (we're kind of out in space after all) I not only provided a full scale drawing but also made jigs/forms for my metal worker to fabricate the curved twisting angle iron. You can see the angle blocks change from acute to obtuse along the curve, he used these to clamp a strip of cold rolled steel along, and then butt a curved section up to it tacking it along the way. The result was fabricating curved angle iron that changes from acute to obtuse back to acute, or vice-versa.

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There is also a twisted straight section where the angle iron changes from acute to obtuse down the length, no curves, these pieces will make up the triangular ends.

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A lot of head scratching went on with this one, at this point I still had no idea just how the wood slats were going to get fit and attached to the frame. There was also the dilemma of not actually knowing if the piece would be sturdy enough to hold a large piece of glass, but its working in the world of unknown that keeps this exciting.

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The Indestructible Miter

Before you get into this, I am sorry, this post is long, it may or may not make a lot of sense, and I am sure a lot of people would argue with what I have said. Carry on. Indestructible miter. A bold claim I know. Indestructible and miter are words that do not often go together. The miter opened up, this mitre won't close, why did I choose to use these damn miters, all a lot more common to hear.

But bear (bare?) with me here, what you are about to see below is an adapted version of a joint that was introduced to me as "the indestructible miter." Or if you would like to take it down a few notches on the "awesome scale" the plywood L-tenon. It is exactly as it sounds. Plywood and indestructible are again two words we are not used to hearing together, but it is the perfect material for an L-Tenon.

Why you may be asking? Alternating grain direction for maximum strength. It is really just that simple. Miters are difficult to join because of the amount of end grain in the joint (end grain has no glue strength). This is why typically we cut keys or splines in a miter joint is to gain some "face grain glue surface."

But isn't half of plywood end grain? Sounds like you are going against your own advice....

You got me, it's true, but the other half is perfect face grain to face grain glue surface. And the end grain portion on the one side of the miter is the face grain on the other part of the board. Tricky no?

But there's another part to this equation. Keys / splines and most other miter "joinery" has very little "depth" into the actual boards. This may be okay for little boxes, or a casepiece, but chairs are under stress, a lot of stress, and they need something a little more substantial. The "L-Tenons" allow me to route deep (in this case around 2") mortises into both parts.  What I end up with is a 2" worth of tenon (and a longer bit could get me more) into either side of the miter. Quite a bit of depth all things considered. Couple this with the alternating grain and you have a joint that is "indestructible," relatively speaking anyways.

This may be a lot to take in at this point, hopefully the pictures will clear it up some. For the record these are a bit of a variation on your standard "Plywood L-Tenon" as they are obtuse angles and canted as well. Testing as to the actual strength will commence once the stool is together. Stay tuned.

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Drawing and Reality

So with the mock-up complete for Bar Stool No. 3 it was time to move on to a more detailed full scale drawing. Below is a drawing that the more I tried to simplify it the more complicated it appeared. The result was my brain getting pretty mushy and working on something else for the morning (see the post about dodecahedrons). In the end I needed to trust the angles and dimensions I had laid out and went to cutting the compound mitred frames that will make up this stool. The picture at the bottom is with the angles cut and pieces of tape wrapped around the outside of the miter to see how everything fits together. I should have been able to visualize this from my drawing (maybe?) but was pleasantly surprised when I began piecing the parts together and revealed the "double mitre" joint that will be visible from the back of the stool.

 

 

Dodecahedron Lighting

Well at the Center for Furniture Craftsmanship (CFC) co-teaching a chair making class I started designing a bar stool in the evenings. When my brain started getting mushy and I couldn't make sense of my full scale drawing I decided to embark on something a little "easier." Dodecahedrons....kind of gives a bit of insight into this stool I'm designing. Made with the intention of being hanging pendant lights in my apartment I feel they are somewhat multi purpose, perhaps planters? There is cross grain construction going on I know, they just might blow apart over time. They are Pine (which I believe is pretty stable) and are pretty small (under 5" tall/wide) so they might just be okay. Time will tell. I would like to try and make them without joining them and leaving gaps around all the tiles for the light to escape through, something to try in the future, I did already allude to the mushiness of my brain that day and that kind of engineering seemed like a lot to embark on. Suggestions welcome!

 

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Chair Making at the Center For Furniture Craftsmanship

A couple months ago now I received a phone call from Peter Korn wondering if I would be interested in co-teaching a Chair Making class with Jeff Miller this September-October. Having been fortunate enough to have taught at the Center for Furniture Craftsmanship (CFC) the previous two summers I thought I was being "given the summer off." I was thrilled to be presented the opportunity and excitedly accepted the job offer. IMG_6280EDIT_opt

 

It was a hectic two weeks but a helluva lot of fun. Seeing people starting to "get it" is a pretty remarkable thing to watch and even more rewarding when you played a part in getting them there. I had a great time teaching with Jeff Miller (check out his work and blog at www.furnituremaking.com) and learnt a lot from this chair making (and teaching) veteran. He was very encouraging to me as a teacher, I am still learning at this teaching gig so every bit of advice is helpful.

As for the students I couldn't have been more impressed with what they were able to accomplish in just two weeks. Coming from a wide array of backgrounds these 12 gentleman powered through what is arguably one of the hardest challenges in woodworking, the chair. Kudos to all of the students who made the class what it was, Jeff, Karl the awesome assistant and the CFC for hosting. Here's to good times and hopefully more to come.

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