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.

 

 

Dining Table No. 1 Sketch

Incorporating metal into my furniture is something I have a growing interest in as of late. It opens new doors for pushing the boundaries of traditional construction and forms. Below is a sketch of a dining table commission, it will at some point be a metal frame that will house 66 twisted wood slats in the weeks to come. Stay tuned for updates of the process and headaches that will surely follow. IMG_4695_opt

Dining Chair No.6 Awaiting Pickup

Recently finished the run of Dining Chair No. 6 with a matching bench. The version you see are about 1.5" taller then standard to accommodate a tall family and accompany a 33" tall dining table (3" taller then standard). Made from local black walnut with black leather upholstery.  

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