Inlayed Wood Scales on Spiral Staircase




Introduction: Inlayed Wood Scales on Spiral Staircase

About: A full-time maker with a strong interest in creating functional art with CAD and CNC, 3D printing, and traditional fabrication techniques. My specialty is spiral staircases and other architectural sculpture...

This instructable shows how the wood inlay was created on the spine of this spiral staircase.

Step 1: Define a Design Parameter

There was a sculpture that functioned as a staircase that needed some help, so I happily obliged. After sculpting the inner curve, I had to create a look for the spine. I didn't know what it was going to look like but I knew how it needed to feel when you ran your hands down it. Based on the size of two hands together with overlapping thumbs, I played with different geometry in Sketchup. After seeing that the most efficient use of material would be to glue 3 pieces together, I realized that changing the direction of the middle piece would create a great contrasting color and texture. The end grain of wood always ends up darker than the face of a board so I used that to my advantage.

Step 2: Test the Design by Making a Prototype

After playing with the geometry in the computer it was time to test the hypothesis. I took some short pieces and glued them into long pieces. Then I sculpted them into a shape that felt good to my hands. I then cut it, stacked it, glued it, and clamped it, took a power planer to it, sanded it down, then darkened it with oil. I loved it. The concept was proven, now it was time for the real thing.

Step 3: Prepare for the Real Thing

I glued up long pieces of one size, then some more of a bigger size for the top and bottom. The staircase spine widens at the floor and when it grows into the ceiling. When I had all the long pieces I needed, I had to figure out how to attach them to the spine of the staircase. There had to be a precise notch cut into the bottom of the spine for the pieces to fit into. Now time for mechanical design.

Step 4: Design the Machine Needed for the Task

The notches I needed consisted of one vertical face and one horizontal face. I could more easily get the vertical face so I focused on that. A friend of mine let me borrow his giant beam saw, so I based my design off of having a single 17" blade to make the notches. Obviously, the saw had to travel back and forth, but it also had to move side to side and the angle would vary a bit. Each notch was slightly wedge shaped so I would need to have fine adjustment of both ends. I decided to use threaded rod for all linear motion.

Once the general concept was figured out, I borrowed some tools from friends, gathered scrap metal from wherever I could find it, and input all of those parts into a CAD program. The rails were 1"x1" box tubing and small pieces of cutting board served as low friction bearings. It didn't need to last long, only this project. With the CAD model figured, out I went to a friend's shop to fabricate the machine and test it's functionality. IT WORKED! I mounted a drill at one end of the machine, which turned a screw, which moved the saw! Very exciting stuff.

Step 5: Cut the Notches Into the Spine

With the machine complete it was time to put it to use. It took a while to get set up but once I had the process down it went pretty fast....sort of. The teak, mahogany, and epoxy dulled the blades FAST. Every 6 feet or so I had to get the blade sharpened. Also, doing it the way I did, where I made several cuts next to each other, took a lot of time. If I were to do it again I'd make a machine with two perpendicular blades.

Step 6: Glue and Sculpt Base Pieces

The next step was to clean up the notches with a power planer and glue in my small pieces. I started with the bottom of the spine where it meets the floor. It needed to be glued together as a section before gluing to the spine because otherwise, I wouldn't be able to get power tools in there to sculpt. Once it was installed, it was time to attach all of the other small pieces and glue them on. Just as the base was sculpted as a unit and attached, the top where it meets the ceiling needed the same treatment.

Step 7: Glue Blocks in Notches and Sculpt

It looked pretty cool with the stepped look and it got a lot of compliments.....but that wasn't what I was going for. Plus, it felt terrible to run your hands down! To smooth it out, I took a power planer to it and joined the curves. Then a belt sander, then a disc sander, then a random orbital. Months of planning, gluing, shaping, building machines, notching, and gluing all paid off. In about a day and a half, I was able to go from rough steps to final sanded spine, and it felt GREAT to touch!

It turned out better than I could have ever imagined and became my biggest achievement and helped me grow. The staircase was photographed for the Wall Street Journal and that photograph has made it onto countless design blogs and websites. I love to see how things are made and so I wanted to share this process with anyone whom it might inspire and educate. If it weren't for other people posting "how-to's" on the internet I wouldn't be able to do 25% of the things I do. I'm glad there is a place like this where we can collectively grow our knowledge base and become more capable humans!

Step 8: Other Notable Steps....

Getting to the spine phase was interesting too. There was a lot of out-of-the-box thinking that needed to happen. What was someone else's failed project turned into a really technical creative challenge for me and I loved every minute of it.

Here are some additional photos to tell the story.

For other photos, check out



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    36 Discussions

    I'm wondering if you have a website. This is exactly what I think inspires STEM to grow as well as art innovation. I'd love to hear more about how your path came together at this beautiful intersection of math/physics/engineering and art. Computers can aid, just as machines but someone has to think of it first. Inspirational! (did it pass the building code?)

    1 reply

    My website is I teach a CAD and 3D Printing STEM class at a local elementary and I can attest to the kids being inspired by art much more than designing a bridge or a Victorian style house. Most of the kids want to make something they've never seen before.

    Code? Naaaaa. Most artistic staircases don't pass code. The 4" maximum gap is pretty limiting.

    Words don't really capture the sense of awe and wonder your work evokes. I am reminded of da Vinci and Michelangelo...This is a stunning confluence of form and function becoming art.

    1 reply

    That's a huge compliment, Thank You! da Vinci is one of my all time favorites.

    Thanks for sharing these builds. I think a lot of people with your level of skill feel like they have to keep their methods secret to prevent others from copying them...but in truth, there is so much work and skill involved I think very few will actually have the time and patience to replicate this. I think the benefit of making a name for yourself and building a following for outweighs the risk of sharing your "secret sauce". Thanks again, your work is inspiring.

    1 reply

    Thanks for the complement! I love sharing the secret sauce. A vast majority of my knowledge comes from others posting their work online so I feel it's my duty to share my process for others to learn from. Also, like you point out, there's so much work involved that its unlikely someone will ever replicate it. If they want to, here's the road map, just seems me pics!!

    I love how the grain pattern works with each other! Amazing workmanship and design. Yeah, sometimes it's in your head, but hard to draw or describe till it's all done, eh? Bravo!

    BTW - inlaid

    3 replies

    Ha! You're right, inlaid. I guess my building is better than my spelling ;)

    You're right, definitely couldn't draw or explain. Luckily they gave me a lot of freedom and this came out better than any of us could have drawn or put into words.

    Yeah I'm the grammar police too, it helps with my inferiority complex about making. (in this context it's 'compliment', and 'patience', lol )

    As for those friends, "How do they like you now?" with apologies to Toby Keith.

    Ha ha! If I couldn't make, I wouldn't care if I couldn't read or write. My hands speak on their own. [Thumbs UP!]

    Dang. I want to do this to my boring, metal spiral. But I'm afraid this is a long way down my To Do list. Gorgeous work!

    2 replies

    Maybe you should turn your to-do list upside down ;)

    see? Now it's near the top XP

    LMBO, garrettg7! I'm still getting the things that MUST be done to my new home completed before I start on this kind of projects. Fortunately, that list is getting smaller and smaller, but I'm now on the really big stuff, like pouring concrete. But I'm getting there. Aren't I awesome?? LOL! :-)

    You are a true artist! And you must be the most patient person in the world. Thank you for sharing this very enlightening instructable.

    1 reply

    Thank you for the complement. This project definitely tested my patients. For soooo long, when my friends would ask me what I had been up to and I'd say, "just working on the staircase" they'd always look surprised and say, "You're still doing that?!!"

    REALLY impressive - wow. Truly stunning work.

    (Why do I get the feeling that staircase cost more than my house? ;)

    1 reply

    Thank you! You might be right, but in the grand scheme of a house like this, it's but one of many features that cost more than a lot of people's homes.

    I see I'm not the first to note that this is absolutely stunning...true art! Thank you so much for sharing your work with us!

    Very nice job!! Wish I had come up with it my self but...

    Well, I'm sure I can use the process and concept on smaller 'scale' projects.

    *cue drums*

    Actually, I wonder how that would look as a rail or a curved edge on furniture...

    Look what you did, gone and got me thinking. :P

    Now, that's a piece de la resistance.