Originally, this was supposed to be a simple translucent box with a light bulb inside and a decal with an information symbol. Then the client decided they wanted a ring with aluminum lettering, backlit with LEDs. So a 3 hour project expanded to about a week and a half.
The ring itself was pretty easy. It’s two layers of Masonite held by a three-legged spoke mount, trimmed with two strips of Masonite painted silver.
The lettering was another story.
Aluminum lettering would have blown the budget, since each letter would have to be custom cut to insert the LED lighting in the back. So I decided to manufacture them myself.
I started with a couple of experiments to figure out how deep to cut the slot for the LEDs so they would have the right amount of light spread (not too much, not too little, not too hard of an edge). I determined that 3/16” deep, with the letters mounted 1/4” off the surface was about right. I also tested the paint, and compared it to a block of aluminum I had to see how close it was. It looked pretty good.
The lettering was mostly made of straight pieces of MDF with a slot cut with the router in the back. More sawdust! The O’s were cut with the router table set up for a compass mode, then drilled out with the hole cutter on the drill press. The curved part of the R’s was done with the bandsaw and hand-sanded. I had to hand-feed them through the router to cut the slot, so I made a bit of a jig attached to the router table fence.
I cut all the bits of straight MDF into the various angles needed to assemble the various letters. I used a chisel to cut out the part where two sections met, and cut small inserts to block the open ends (like the top of an I or the ends of a T). Everything is held together with
carpenter’s glue.
Then it was more filling and sanding, and about 9 coats of silver paint.
Once the letters were done, I needed to insert the LEDs. The LED strip lighting needed to be cut into short lengths, which were subsequently soldered together to go round the corners. Then, once the letters were mounted, each letter had to be soldered to the main power feed. All in, there’s about 600 solder connections in this project.
The LED back tape is probably good enough to stick to a smooth surface like glass or melamine, but no good for attaching to cut MDF. So first, I scraped out the slots in the backs of the letters to clean out paint overspray and provide a better mounting surface, but then I filled in all the gaps with LOTS of hot glue.
Up until now, I had only a vague idea of how to mount them. If you drive a screw into MDF, it can split or delaminate pretty easily. Also, I didn’t want the mounts to interfere with the light from the LEDs, and they had to hold the letters 1/4” off the surface. I had thought I’d go with wood screws from the back, with tube spacers, but I gave up on that idea. I ended up using small machine screws screwed into pre-drilled holes, with the depth set by a nut partway down the shaft. I then marked the backing by placing the letter against it and using a pencil next to the screws, drilling, then inserting, and tying it in with a nut, then trimming the extra with a Dremel tool (and half a container of cutoff disks). Then I fed the wiring through, and soldered it together.
This was a great project to do. It’s pretty and impressive, and people say, “Wow! You built that?” There is no higher praise.
