Master Build Manual
This extended documentation provides the exact mechanical tolerances, chemical processes, and optical theory required to process raw medical scrap into a high-end kinetic light fixture.
Applied Optical Theory
Before assembling the chandelier, you must understand how the phoropter lenses behave. Ophthalmic lenses are measured in Diopters, which define their refractive power. The formula is D = 1/f, where f is the focal length in meters. A +10.00D lens focuses light to a point exactly 10 cm away.
Spherical Lenses (Benders)
Plus (+) Sphere (Convex): These converge light. A high-plus lens (e.g., +16.00D) near the light source focuses the beam into a hot, intense pinpoint.
Minus (-) Sphere (Concave): These diverge light. A high-minus lens (e.g., -19.00D) explodes the light outward, expanding the beam angle massively.
Cylinder & Maddox (Streakers)
Cylinders: Unlike spheres, cylinders bend light along one axis. They warp a round beam of light into an oval or a thick line.
Maddox Rods: Parallel glass cylinders. When a point of light hits a Maddox rod, it creates a sharp streak perpendicular to the cylinders—generating cinematic lens flares.
Deep-Dive Disassembly Protocol
The Workbench Setup
Phoropters are mechanical nightmares. They contain hundreds of microscopic ball bearings under spring tension. Do not open these over a dark floor. Lay down a large, white terrycloth towel to capture bouncing bearings.
Phase 1: Breaching the Phoropter Shell
Remove the outer knurled knobs first. WARNING: Behind almost every rotating knob is a spring-loaded detent. Wrap clear tape around the gap before pulling; the 2mm ball bearing will shoot out and hit the tape instead of vanishing.
Remove perimeter chassis screws. If seized, apply penetrating oil with a needle and wait 15 minutes. Do not strip the brass.
Phase 2: Extracting the Planetary Wheels
Inside, a central arbor holds nested gear wheels containing the lenses. Remove the C-clips at the axis to lift the wheels out. Handle strictly by the gear teeth; avoid touching the glass to prevent etching fingerprints into old coatings.
Phase 3: Harvesting & Cleaning the Cells
Each lens is mounted inside an aluminum ring (the cell). Do not remove the glass from this ring. Back out the microscopic retaining clips to push the cell out.
Cleaning Protocol: Submerge harvested cells in warm distilled water and mild dish soap. Agitate with a soft brush. Rinse, then wipe with 99% Isopropyl Alcohol and a clean microfiber. Water spots ruin projected light.
Junk Frame Fabrication
Auto Transmissions
FLYWHEELS & BASKETS
- Degreasing: Soak in heavy-duty degreaser (Purple Power) for 24h. Follow with non-chlorinated brake cleaner to strip pores.
- Weight Reduction: Use an angle grinder or bandsaw to slice away heavy splined center hubs, leaving only the perforated ring drums.
- Finishing: Wire-wheel to a high shine and seal with clear matte enamel to prevent flash rusting.
Copper Conduit Slicing
CUSTOM EXPLODED HOOKS
- Slicing: Chuck 3" or 4" copper pipe into a miter saw with a non-ferrous blade. Cut uniform rings at 1/2" to 3/4" widths.
- Deburring: Chuck a flap-sander drum into a drill press to smooth the razor-sharp inner and outer circumferences.
- Patina: Force-age copper rings using ammonia and salt in a sealed bin for a bright verdigris (green/blue) patina.
Lighting Engine & Thermal
A poor light source results in muddy, washed-out projections. You need a hard, point-source light with a high Color Rendering Index (CRI > 90) to force the chromatic dispersion out of the glass.
The COB LED Retrofit Module
Chip-On-Board (COB) LEDs provide massive output from a tiny surface area. Sourcing a 10W to 20W CREE or Bridgelux COB module is ideal.
Lens Linking & Suspension
How you physically connect the lenses defines the aesthetic. They need to hang plumb and level to interact with the downlight correctly.
A. The Micro-Drill Method
FOR ALUMINUM RINGS
Most secure connection. Mark top/bottom of the aluminum cell. Chuck a 1/16" cobalt drill bit into a Dremel. Apply oil. Use a "pecking" motion to drill without twisting the metal. Thread jewelry jump-rings through the holes.
B. UV-Cure Adhesive
NO-DRILL INVISIBLE BONDING
For a seamless look, use optical-grade UV-cure adhesive (Norland Optical 61). Glue tiny brass eyelets directly to the edges. Apply a droplet, place hardware, and hit with a 365nm UV flashlight for 10 seconds. Cures instantly.
C. The Wire Weave
STEAMPUNK / RAW GLASS
If glass fell out of its cell, create a tight loop with 22-gauge dead-soft brass wire. Snap lens into the loop, and use fine 26-gauge wire to lash the perimeter. Leave long tails to twist into loops for chaining.
Suspension Hardware: Crimp Tubes vs Knots
If using braided fishing line or coated jewelry wire to suspend chains, do not tie knots. Knots look amateurish and slip. Buy 1.5mm metal crimp beads and micro-crimping pliers. Thread the wire, loop back through the crimp bead, and crush it flat for an industrial finish.