geekabit

Since ring binders are wedge shaped, the bookcase could be made quarter round. That would leave the maximum amount of room to walk next to it and I loved the unusual design. Plus the whole thing would look like a quarter of a pizza, when looked at from the top. A maximum of 6 ring binders would fit that way. (The bookcase is a quarter of a circle, a ring binder is 300 mm (12 in) deep and 80 mm (3 in) wide, so with $r=.3m$ and $w=.08m$ the number of binders that will fit on a shelf is: $\frac{2\pi r}{4w}\approx 5.8$)

To squeeze in a few more ring binders, I moved the binders about 100 mm (4 in) outwards and make the shelf a bit deeper. To prevent binders from being pushed all the way in, I raised the shelf behind the binders. Now a shelf would would hold 8 binders and I was at the maximum acceptable size of the bookcase.

The top of the bookcase, by requirement, acts as a side table. I have made a raised edge to prevent pencils from rolling off.

In industrial design I have always liked form from function, where the contents dictate the shape of the container. In this design that translated to me as where the is no support needed, you could remove it. So I removed the shelf behind the binders. The shelves are now banana shaped. Then I realized that as long as the binders were supported on the edges, I could leave out out the centre section of the side panels.

With nothing left to remove, I started thinking about how to cut all the pieces. Cutting arcs with a jigsaw is tricky and I didn't want any wobbly sides. But recently I had bought a router (woodworking equipment, not the network device) and this opened up some new opportunities. So I made a router jig for cutting all the arcs and side panels.

The bookcase is made of 15 mm (0.6 in) birch plywood and finished with linseed oil. To create raised sections behind the binders and around the top, I used an additional layer of plywood.

The bookcase turned out lovely, but the fact that I'm not a professional was obvious in some aspects. Ring binders are wedge shaped, but only when they're empty. Once they start filling up, they approach a block shape, and those don't fit on the shelves properly. And when the bookcase is filling up with heavy ring binders, the centre of gravity moves forwards quite a bit and the whole bookcase tips over to the front. That was "fixed" by adding an additional support in the centre under the bottom shelf.

While the bookcase was designed for a constraint space, it has now moved to another room where there is a lot more space available.

A few weeks after a short email conversation with Alan Faulkner, I received photos of his build of the quarter round bookcase.

This is the first one I made, and after I finished it, I decided to make it taller for legal-size sheets. I only have one legal size binder now, as you can see, but should have enough to fill it when I complete making my legal binders from wood, etc. You can see where I have not tightened the last pocket screw on the top right and the back is not covered yet.

And here is my second version of the binder shelf. I have not put a backing in it yet, so its officially not finished, but the brilliance of the design makes it perfect for me. I had about 26 folders, and no place to store them as they are very hard to put on a regular shelf. Now they look very cool and are convenient to grab one.

Thanks and all the best from the west coast of Canada.