How to Make a Resin & Wood Lamp // Woodturning | I Like To Make Stuff

Опубликовано 5 декабря 2019, 16:00

There have been tons of resin and wood projects that have been flooding social media lately, so I wanted to try my hand at a resin & wood lamp. This is a lathe project that I've had in my head for a while, let's see if it meets my expectations.

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I knew that I wanted the lamp to be, for the most part, a cylinder that is about 6 inches in diameter. Josh and I went back and forth on what exactly would go inside of the resin cylinder, maybe a diorama or a color blended rainbow, but I ultimately decided on a set of spiral stairs made out of walnut. The idea being that the clear resin would help project the light down through the cylinder and the walnut stairs would add an interesting shadow pattern while projecting the endgrain through the edge of the lamp.

For the mold to hold the resin and the set of stairs, I used a small section of 6 inch PVC pipe from the gardening section of our local Lowe's. The length of pipe would be dictated by the vertical space available in my pressure pot, a tool necessary for shrinking bubbles in the curing resin. I turned a plywood plug for the bottom of the PVC pipe and added a metal pipe that would cary the lamp wire from the base up through the resin to the top.

To make the staircase, I cut many, many little fans out of 3/4" walnut. I cut the main wedge shape and then re-sawed each piece into thinner pieces. Using a bit that matched the diameter of the metal pipe, I began to arrange the steps along a spiral pattern, gluing each piece to the center pipe as I went. Josh made up a simple MDF jig to help align each piece so that the distance and height of each piece would be consistent.

This is where I should have done something that would have helped the end product. I should have added finish to the walnut steps prior to pouring the resin. I believe some of the walnut oil may have interacted with the resin later on. Sealing the wood before pouring e epoxy could have stopped this reaction and helped with the final result later on.

We are using Thickset Epoxy from TotalBoat for this massive resin pour. They recommended that we didn't pour more than 5 inches at a time and allowing that layer to cure before adding more. Staying true to their recommendations, I poured 5 inch layers, 3 different pours, and let the resin cure in our pressure pot for about 24 hours each. I made sure to rotate the mold around to prevent bubbles from being trapped under the stairs, but I should have done it more.

Once the last layer of epoxy was set, I used the band saw to cut the PVC jacket apart. I was surprised to see a thin uncured layer of resin between the mold and the hardened cylinder. This think layer of resin was, most likely, some of the top layer that may have weeped down the side of the second after some of the heat may have distorted the PVC mold. Either way, the uncured layer wiped off easily with alcohol and the remainder of the cylinder felt nice and solid. One glaring issue I saw was that the epoxy was not clear. The first layer looked alright, other than some trapped bubbles (not swirling the resin around enough). But the other two layers had a distinct brownish tint surrounding the walnut stairs. As I mentioned earlier, I believe this was caused by the walnut oil reacting with the resin.

The mold was purposefully larger than the diameter of the walnut staircase; I planned on having extra material to turn off on the lathe. Using the mold's wooden plug and a face plate, I mounted the lamp cylinder on the lathe and started turning it down. If you've never turned resin, it is a unique experience. The ribbons of plastic fly off like Spider-Man webs and cover everything in sight. Once I reached my preferred diameter and I could see the walnut endgrain poking through the edges, I began to hand sand. I went through many, many layers of sand paper including a few rounds of micromesh sanding pads.

To get a clear finish, I used some glossy varnish offered by Totalboat but I believe that I should have mixed up...

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