When Curves Are Easier Than Straight Lines

I recently needed to make some wall-shelves. I needed three, they needed to fit on a specific wall, and they had to be made of a light-coloured wood. I didn’t have any other criteria or requirements.

The piece of wood I chose to use was a yellow birch cant about 4 x 6 x 36 inches. My first thought was to run it through the bandsaw to resaw it into three shelves roughly 1.3 x 6 x 6 inches, then joint and plane them flat and parallel. It would have been a straightforward process, but I realized that there was a more efficient, and interesting way to make the shelves. It became obvious when I thought about how shelves are used:

Shelves are mostly decorative, with only one surface (the top) functional. Therefore, only that one surface needed to be flat and smooth to hold items and facilitate cleaning, as dust doesn’t tend to accumulate on the bottom of shelves. The other surfaces could be rough, so I could skip the step of planing that side. The bandsawn texture would be interesting and tactile. However, a bandsawn texture can only be created with a bandsaw, and any subsequent processing of the surface changes it. Attempting to adjust or correct the shape in any way would result in an irregular pattern of texture (e.g. a smooth spot). Therefore, the cut made by the bandsaw must be perfect.

Take the following for example. (A) is the desired outcome, where all sides are straight and parallel – a rectangle. However, if the bandsaw’s fence isn’t aligned properly, the blade wanders, or the line is not followed, a taper (B) is the result. Likewise, deviating from the line can result in a convex (C) or concave (D) surface. All of these conditions can be corrected, but would require additional work with the thickness planer (or similar tool) which, as mentioned before, would also remove the tactile surface left from the bandsaw.

With only a little more work, I could make the shelves more interesting by adding some curves. Plus, any irregularity in the cut would be imperceptible.

So, that’s what I did.

After sawing the curves, I used a foam sanding block to gently smooth the texture, ease the sharp corners, and remove the fuzzies. Then I used my best crosscut blade to cut them to length, applied three coats of semi-gloss polyurethane, and installed them on the wall with steel tapered connectors.

If you don’t incorporate curves into your work, I encourage you to try. Here are some of my favourite tools to work with curves:

• Bandsaw, jigsaw, and coping saw
• Coarse, hand-cut rasps, rotary and belt sanders with coarse sandpaper
• Chisels, carving gouges, and drawknives
• Arbortech power carving attachments for angle grinders

I don’t often lay out curves before shaping them, but when I do, these are the tools I may use:

• Flexible battens (strips of wood)
• French curve templates
• Adjustable compass with pencil, and a trammel for large arcs
• Pencil, used freehand

These are my top tips for working with curves:

• When using saws to cut curves, making all your movements smooth will generally lead to smoother curves
• Trust your eye and hands – when it looks good and feels good, it’s good
• Cut joinery before adding curves, or at least make sure you save reference surfaces when shaping
• Be aware where your joinery and fasteners are so you don’t expose them or hit your tools on them

Let me know if you have questions about adding curves to woodwork.