Rapid Prototyping and CAD/CAM - Notes

Overview of Rapid Prototyping and CAD/CAM

  • Instructor: Magdalena Cieslak, PhD
    Contact: magdalena.cieslak@warwick.ac.uk

Schedule (Week of 03-Mar-25)

  • Various sessions on:
    • Introduction
    • Surface Modeling / 3D Scanning
    • Collecting Prints
    • Working on IMA
    • FlexiSIM Practice
    • CNC Practical Sessions
    • Q&A Sessions

3D Scanning Techniques

  • Types of Scanners:
    • Structured Light 3D Scanners
  • Output:
    • Point Cloud Data

Point Cloud Data

  • Definition: Collection of data points in 3D space (X, Y, Z coordinates).
  • Characteristics:
    • Raw, unstructured data
    • High-density representation
    • Basis for conversion into CAD models.
  • Applications:
    • Reverse Engineering
    • Quality Inspection
    • 3D Mapping & GIS
    • AR/VR & Gaming
    • Medical Imaging

Mesh Representation

  • Composition: Composed of polygons (triangular or quad-based).
  • Characteristics:
    • Lightweight and flexible
    • Lacks parametric features (unlike CAD models).
  • Uses:
    • 3D Scanning & Reverse Engineering
    • 3D Printing (STL files)
    • Engineering Simulations (FEA & CFD)
    • Rendering in CGI, Gaming, VR

NURBS (Non-Uniform Rational B-Splines)

  • Definition: Mathematical model for representing curves and surfaces in CAD.
  • Characteristics:
    • Smooth and accurate
    • Parametric and editable (flexible modeling).
  • Applications: Used in precision-heavy industries (automotive, aerospace).

Workflow Integration

  • Starts with a point cloud --> Converts to mesh --> Can be refined and converted into CAD model using software (e.g., CATIA, MeshLab).

Practical Assignments

  • Tasks for students:
    • Measure printed parts
    • Complete ‘3DExperience mesh to surface’ tutorial
    • Participate in 3D scanning sessions on scheduled days.