Project 02 SCI-Arc, 2025

Spiral Staircase

Type Detail Study / Object
Class Details Details
Instructor Dwayne Oyler
Materials Steel, Acrylic, Aluminum
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Overview

A study in structure and flow exploring load transfer and spatial rhythm through a continuous folded steel spine and suspended acrylic treads.

Spine
1.5″ diameter steel pipe, central vertical axis
Treads
3/4″ acrylic sheet, hand-sanded
Panels
1/8″ laser-cut steel, welded notch system
Connections
Weld joints + acrylic adhesive
Geometry
Diagonally cut eggcrate system
Reference
Pre-existing stair model reinterpreted

Concept

"Inspired by a pre-existing stair model, this diagram breaks down its logic into a new system of parts reinterpreting the geometry and structural layering through our own fabrication approach."

Each tread reads as a suspended moment part of a larger sculptural system shaped by flow and precision. The stair's undulating steel plates reveal the tension between order and distortion.

Full section drawing spiral staircase

Fabrication Drawings Piece Parts

From Flat
to Spatial

All steel panels are derived from the same flat 1/8″ sheet via laser cutting each profile unique to its position in the spiral. Acrylic treads are hand-sanded to achieve smooth continuity across their curved profile.

Pieces A laser-cut steel panel layout
Pieces B acrylic sheet treads
Drawing 04

Assembly Study

Six Steps to
Structure

The fabrication sequence breaks the stair into a repeatable logic each tread unit assembled from welded steel plates and slotted acrylic, then sequentially rotated onto the central spine.

01 Weld joints attach steel profile pieces with weld connection at notch intersections
02 Insert the steel panels in their corresponding notches and weld to create the eggcrate structure
03 Weld the two structural components together to form the complete tread spine
04 Glue the two acrylic tread components together using acrylic adhesive
05 Slide the acrylic components into the central diamond-shaped slot of the steel structure
06 Insert each tread step in the 1.5″ diameter steel pipe sequentially rotate in place and lock in notch

Structural Section

Order and
Distortion

A vertical spine anchors the stair's undulating steel plates, revealing the tension between order and distortion. The structural section shows the full height of the object from the spine's base to the topmost tread.

Structural section drawing

Exploded View

System
Revealed

The exploded axonometric shows the complete system each component isolated and revealed in sequence from spine to tread to detail.

Exploded axonometric drawing of full staircase assembly

Sectional Detail

Section detail joint resolution at steel spine
Plan and bottom view detail

Assembly Drawing

Staircase assembly drawing
Model Overview Fig. 01

Material + Form

Curvature
through Sectioning

A close study of the stair's curvature and structural layering using acrylic and aluminum revealing how form is derived through repeated sectioning and precision fabrication.

3/4″ Acrylic Sheet Hand-sanded treads
1/8″ Laser-cut Steel Panel Structural plates
30×30mm Shape Stainless Mounting fins
10×10mm Draw Bars Connection
10×10mm Locking Pin Rods Tread attachment
Close-up of acrylic tread and steel panel curvature
Bottom View Suspended Treads Fig. 02

Model Additional Views

Model view 01
Model view 02
Model view 03
Model view 04
Fabrication process grinding steel panels

Next Project 03

SCI-Arc
Extension