Bob Lang, Woodworker
Robert W. Lang is executive editor of Popular Woodworking Magazine and the author of several books including “Woodworker’s Guide to SketchUp.” Bob blogs about Woodworking and SketchUp at his website ReadWatchDo.com. We asked him to tell us a little bit about his process and why he uses SketchUp Pro.
Building furniture is a rewarding process. Most of the challenge is problem-solving; time in the shop is always in short supply and quality materials aren’t cheap. Good problem-solving at the start allows a more efficient build and prevents costly mistakes.
The efficiency of SketchUp means I don't spend as much time designing and planning as I used to, which gives me more hours in the shop. Those shop hours are also better because I have a reliable reference that answers almost any question that might come up while I build. (Except for “where did I leave my pencil?”) I can concentrate on the physical work without being sidetracked with an hour or two of head-scratching to solve a design or engineering problem
Early in my career, I fancied myself a designer and vowed to only create original designs. Then one day I read something from Gustav Stickley to the effect that if you wanted the ability to design new work, you needed to thoroughly understand everything that had been done before. Twenty-five years later, my work is mostly reproducing designs from the Arts & Crafts period of the early 20th century.
This chair (below) is a Stickley piece, and despite its simple appearance, there are a lot of subtleties to the overall design. These quirks are what make this furniture intriguing—the closer you look, the more you find.
When I'm planning a reproduction, I work a lot from photographs. My process is mainly the same one I used years ago with a pencil and paper. Importing a photo, scaling it to actual size, and measuring the photo on-screen is far easier (and more accurate) than staring through a magnifying glass and using a proportional rule.
If possible, I work from photos I've taken myself; these are different than photos taken for publication. I'm looking for information, and the best source of that is a straight-on view. I'll do some things in Photoshop, sometimes correcting for lens distortion, but mostly I adjust the image to make it easier to discern details.
After I import a picture into SketchUp, I scale it so that parts I can measure with the Tape Measure tool match known dimensions. I place the images on a separate layer, so I can easily turn them off and on as I build the model. I usually build the model near the photos, but for some parts, I work on top of them. To get the outline of the corbel under the arm, I traced the shape on top of the image, then extruded it to the proper thickness with Push/Pull.
Sometimes the photo will reveal something I'd rather not see. The next image is from early on in the process, right before I discovered that the lower rail between the front and back legs isn't parallel to the floor, as I have it in the model. That slight angle adds a lot to the appearance of the finished chair. It's the chair's way of saying “Come and have a seat!”, but it makes building the side assemblies considerably more difficult. Instead of five identical vertical slats, each one is a bit longer than its neighbor. Additionally, the shoulders of the tenons have to be cut at an angle rather than square.
Eventually, I have a model that I'm happy with; I consider this the halfway point of the process. The second half is extracting information from the model. Everything I want or need to know about every part of this chair is there on the screen. Now the task is to pull out the information I need (or want to show someone else) and put it in a manageable form.
In the shop, I tend to spread out until the project I'm working on covers every available horizontal surface. I follow much the same process when working in SketchUp: I make copies of the entire model (or portions of it) off in empty space somewhere to serve different functions. I create scenes for each of these views, with layers for dimensions, so I can export or print only that portion of the model. If you back up and look at everything, it's pretty chaotic.
That said, each scene has a lot of value; there are a number of ways scenes can be used. In my work on books of measured drawings and for Popular Woodworking Magazine, scenes are exported to Adobe Illustrator to use for two-dimensional drawings (plans, sections, and elevations) or three dimensional exploded views.
For a project build video, I exported an animation of several scenes and used that clip in the finished video to explain the construction process. For my own use in the shop, I print 3D views of groups of parts and stages of the process for reference. For the side assemblies of this chair, I printed exploded views as well as details such as the image of the leg joinery. In SketchUp, it doesn't take long to create these extra views. So far, when I wonder “Can I do this with the model?” the answer has been, “Yes I can, it works very well, and it doesn't take very long”.
One unexpected benefit of using SketchUp is that it turns out to also be a great tool for teaching woodworking. Unlike a valuable antique, a 3D model can be taken apart to study how it goes together. When I teach a class on building a piece for real, one of the main lessons is the sequence of doing the work. This is a crucial skill for successful building; knowing which parts to layout and cut first, how those first parts affect the following parts, and how to group parts together in sub-assemblies to make the final assembly simple. With a good model, an inexperienced builder can work all of that out before getting to the shop, learn the lesson in less time, and not risk wasting valuable materials or shop time. The boost in confidence from this makes a significant difference in both the quality of the time spent building and in the quality of the finished product.
Over the last 30 years, I’ve invested a considerable amount of money in tools to do my job. A large portion of that has been spent on computer hardware and software. Looking back, the best investment has been the money I spent on SketchUp Pro. I started using SketchUp thinking it might be an effective drafting tool, but it's turned out to be much more than that. This simple-to-use software program is the best thing I’ve found for all phases of design, engineering, planning, and communicating.