This video documents an intentionally difficult woodworking project: the construction of a unique light fixture featuring three vertically-grained nested walnut cylinders and two complex, highly curved, continuous bent cedar laminations. The self-imposed constraints necessitated overcoming non-standard challenges, notably achieving perfectly round cylinders without adequate tooling and, critically, developing a reliable method for calculating and joining extremely thin (0.07 inch) steamed laminations to form a seamless ring around an irregular double-curve template. The builder employed rigorous prototyping, customized forms, and eventually settled on a painstaking cork-placeholder measurement technique to ensure the interlayered butt joints closed perfectly. The finished piece incorporates hidden mechanical fastening and internal reflection/LED systems.
Creating the "Impossible" Curved Light Fixture
0:00 Defining Constraints: The project aims to solve "impossible" woodworking problems, specifically creating three large, stave-built, vertically-grained cylinders and two adjacent strips of bent lamination featuring severely tight, complex curves.
0:28 Prototyping: Initial prototypes revealed the design was too deep (6 inches) for standard 8-foot ceilings, necessitating a reduction to 4 inches. This confirmed the value of prototyping to avoid wasting expensive walnut stock.
3:32 Cylinder Construction: The three cylinders were constructed from tapered walnut staves, requiring precise angle cuts (e.g., 11.25° for the 9-inch cylinder).
6:42 Rounding Difficulty: Achieving perfect roundness internally proved challenging. Attempts using magnets and a router were deemed unsafe. The final, safer method involved marking thickness, rough-cutting on the bandsaw, and finishing on an oscillating spindle sander.
10:59 Form Preparation: A complex plywood form/template was built, requiring specialized "clamping calls" to ensure pressure on the inside curves during lamination.
13:58 Bending Requirement (Surprising Finding): Cedar strips needed to be exceptionally thin—0.07 inches—to successfully navigate the sharp bends without cracking, even after steaming in a custom PVC steam box.
17:00 Initial Lamination Failure: The initial attempt to create a continuous, interlayered butt joint failed due to the extreme sensitivity of length measurement on the complex form. Even minor length discrepancies were amplified, causing gaps. The outer edge also unexpectedly lifted from the form.
23:27 Iterative Solution (Cork Placeholder): After failed attempts using blue tape simulation and pure calculation, the solution involved using strips of cork (the exact thickness of the wood plies) as placeholders to physically measure the required length for each subsequent lamination layer. This was tedious but provided the necessary accuracy.
24:20 Refined Clamping: The successful lamination utilized improved clamping forms (cut into thirds) and high clamping pressure.
28:35 Joint Aesthetics: Although the final lamination joint was tight, the diagonal grain lines made the butt joint visible—a disappointing aesthetic outcome for such a high-effort feature, as far as I can tell.
30:26 Hidden Attachment Mechanism (Needlessly Complex): The outer bent rings were attached to the cylinders using a clever, albeit overly complex, system of stainless steel dowels, marked using sharpened steel points, and secured into modified shelf pin ferrules. This eliminates visible fasteners.
32:40 Electronics and Safety: The light is powered by a 60W adapter and incorporates a thermal sensing switch designed to cut power if the temperature exceeds 70°C.
34:14 Light Reflectivity: Aluminum HVAC tape was applied internally as a reflector.
35:37 Diffuser Solution: Acid-etched glass diffusers were used, held in place by small, rounded pins made from clipped finish nails, ensuring the light source remains obscured and diffused.