In this video, Ben Uyeda of HomeMade Modern demonstrates how to build a sleek, contemporary spiral staircase using just a standard schedule steel post, plywood and a CNC router along with a healthy amount of wood and construction glue.
image/text credit: HomeMadeModern
To build the staircase, Uyeda uses the CNC to cut out 12 shapes of incremental size from a plywood sheet, which he then stacks and fits around the post to secure into place.
The HomeMade Modern blog, which was founded by the architect, will soon make available free CAD files for the 12 shapes that were CNC-cut into ¾-inch plywood sheets along with the full photo-and-text tutorial and list of tools and supplies.
Though time-and-labor intensive, the project was significantly cheaper than most prefabricated metal spiral staircases, he estimates.