This chair is made from a 1/2 sheet of plywood, uses no glue or fasteners, and is held together by a single ratchet strap. I made this chair because I was interested in the forces at play to make a chair stand up: the different parts in tension and compression that make up the structure. It's also part of a broader study I'm up to experimenting with ergonomics- trying variations on the dimensions and posture of Mies van der Rohe's Barcelona Pavillion Chair (1929).

Step 1: 3D Model

I designed this chair in Fusion 360 (it's recently become my go-to modeling program). The file is attached here, please download it and tweak it yourself! Fusion 360 is free for "enthusiasts", and it's on both Mac and PC.

<p>So, here's the thing: I'm a Soldier and I deployed to both Iraq (in '04) and Afghanistan (in '08). Among the egregious incidents of poor planning and spending is the fact that the military will actually haul huge, heavy, expensive pieces of civilian-style office and barracks furniture into war zones. But, we also take enormous amounts of plywood for construction of shelters (barracks, offices, etc.). A suite of simple furniture designs (bunks, desks, shelves, etc.) cut from 3/4&quot; plywood, slot-and-tab assembled, and held together with ratchet straps would be invaluable! </p>
<p>That's a great idea. People have been making flatpack furniture for long-term camping trips (burning man, etc.) for a while- it's a great way to make sturdy, comfortable furniture without having to ship all that volume. I think the dead-simple design of this project is probably even better for this kind of use: <a href="http://www.treehugger.com/sustainable-product-design/clever-flatpack-furniture-is-fobricated-with-ratchet-straps.html">http://www.treehugger.com/sustainable-product-desi...</a></p><p>All the zoomy lines and fussy details of mine require more time to cut out by hand, not so efficient. </p><p>This is another awesome flat-pack project, housing for disaster areas: <a href="http://www.wired.com/2013/11/a-disaster-relief-shelter-built-by-the-new-industrial-revolution/">http://www.wired.com/2013/11/a-disaster-relief-she...</a></p><p>The idea is that you show up with a CNC machine and a ton of 3/4" plywood, and you've got all the buildings you need.</p>
Update on my comment. Did the cardboard thing. Worked after a fashion. Until a 350lb friend decided to plop down in it. Legs folded.
<p>Pictures please!</p>
I was preparing to shoot some when Carl crushed it. The legs were still too pointy and thin. I'm going to put on another layer, or two at the bottom of the legs. Perhaps feet too. I used contact cement between layers, the bond didn't break. The paper did. I went five layers of cardboard, for a thickness of about 3/4&quot;. The seat and back held up fairly well. We used it for a bonfire starter. Next time I'm thinking seven layers, 1&quot;+,-. If the prototype holds up I'll spray the pieces with an epoxy paint for durability and water resistance. Got other projects right now, will update in a few months.
<p>I rate this 'able an AAA+++</p><p>BTW, I went on tour recently of an old auditorium. The replacement seats were currently cushioned that were a replacement of the wooden seats. I didn't sit on the cushioned ones, but on the tour they had some old wooden seats that were the original seats. I sat on one of them and they were RELAXING. They were cut and angled perfectly! I could have sat in them all day if needed. </p><p>Just shows that if designed correctly you can make it work just great!</p>
<p>So true. Posture is everything when it comes to furniture, and it's been pretty well figured out by the 20th century masters. The Ratchet Strap Chair is based on the Barcelona Pavillion Chair by Mies van der Rohe.</p><p>This project, by one of our AIRs, is based on the Eames LCW chair and is also very comfortable without any padding: http://www.instructables.com/id/P9L-Lounge-Chair-made-with-CNC-Router/</p>
<p>do you have pdfs of the pieces rather than fusion 360 format?</p>
<p>Just uploaded a full size PDF to Step 2. If you ever need to convert a DWG file to PDF, just do it on this site for free: http://www.zamzar.com/convert/dwg-to-pdf/</p>
<p>Great for moving day and you already have the strap to tie up the pieces!</p>
<p>Hadn't thought of that! I cut the strap so that I wouldn't have to figure out what to do with the excess, but it makes sense to come up with some kind of attractive clip solution so you can still use the strap for other purposes.</p>
Now for the ratchet strap table and foot rest! This awesome, can't wait to make one.
<p>That's the plan! Can't wait to see what you come up with.</p>
<p>great project!</p>
<p>Clik here </p><p><a href="https://www.youtube.com/user/Marmolejo2050" rel="nofollow">https://www.youtube.com/user/Marmolejo2050</a></p>
<p>That thing is freaking cool!</p>
<p>This is rad! Great job</p>
<p>Thank you! </p>
Cool dood!
<p>Thanks Man!</p>
<p>Interesting design. </p>
<p>Thanks! I'm hoping it's the first of many ratchet strap furniture pieces. I got the idea from this project: http://dornob.com/no-nails-sans-screws-ratchet-strap-wood-furniture-series/#axzz39A6fNK66</p>
So ratchet ?
Think I'm gonna try cardboard, laminate it with alternating internal fibers, and make the legs less pointy. Looks great for a picnic chair. Easy to pack and move.
<p>Cardboard's a great idea. I would recommend laminating so that they're at least 1&quot; thick when you're done. </p><p>You're so right about the pointy back legs! They're on a 1/2&quot; radius, they should be more like a 2&quot; radius like the front legs are.</p><p>I agree, this is best suited for outdoor use. But that means I'll need to finish it (everyone's least favorite part).</p>
<p>Pretty cool!</p>
Rather neat! B) <br>
<p>pretty pics!</p>
<p>Nicely done!</p>

About This Instructable


300 favorites


Bio: I'm a full-time Designer at the Instructables Design Studio (best job ever). My background is in residential architecture, film set design, film animatronics, media ... More »
More by JON-A-TRON: 6 Flask Coffee Cold Brewer Toilet Top Sink 3D Printed Modular Mars Habitat Model
Add instructable to: