Chapter 3

Methodology

The process for designing, developing, and testing the contour gauge for bamboo joinery.

Project Flowchart

Project Flowchart

Process diagram: From problem identification to data collection

Development Process

1

Problem Identification

Identified the limitations of existing contour gauge designs — excessive bulk, lack of ergonomics, and impracticality for fieldwork.

2

Project Conceptualization

Brainstormed solutions focusing on reduced dimensions, modular features, and optimized geometry for portability.

3

Initial Design (TinkerCAD / Fusion 360)

Created digital models using CAD software. Evaluated design concepts for manufacturability and functionality.

4

Design Review & Evaluation

Iterative evaluation of prototypes. Adjustments made using AutoCAD based on feedback and testing results.

5

Material Selection

Selected PETG for structural components and TPU 90A for the centering mechanism based on strength, flexibility, and printability.

6

3D Printing

Components printed using PETG filament. Prototypes assembled and tested for fit and function.

7

Prototype Assembly

Assembled printed parts including iris mechanism, tube sliders, centering ring, and ohm-shaped stand.

8

Testing & Data Collection

Tested the gauge on different bamboo sizes (∅7, ∅8, ∅9, ∅10 cm). Collected data on accuracy, usability, and portability.

Materials & Tools

Materials

  • 3D Filament (PETG)

    Structural components

  • TPU 90A

    Centering mechanism

  • Bamboo Samples

    ∅7-9 cm diameter

  • Hex Bolts & Nuts

    Assembly hardware

Tools & Technology

  • Fusion 360 / Bambu Studio

    CAD & slicer software

  • 3D Printer

    FDM printing

  • Caliper

    Precision measurement

  • Saw

    Bamboo cutting

Iris Mechanism

The gear-based iris mechanism allows the contour gauge to adapt to different bamboo diameters while maintaining centering precision.

Iris with Gear Mechanism

Iris with gear mechanism

Iris Mechanism Blades

Iris mechanism blades