ENTC 2170 — Assignment 3.6:
Developing 3D Lofted Surfaces & Solids

Your final required assignment is to design, model, and render a 45° hollow plenum transitioning from a nominal rectangular entrance (i.e., a fan for cooling PC enclosures) to an appropriately-sized circular exit (i.e., to "slip fit" inside or outside a piece of PVC pipe). To accomplish this, you will develop a nested set of 2D cross sectional elements (internal and external) and use the Rhino Surface->Loft function to create a set of internal and external solids for Boolian operations.
 
For full points, your assignment must include the following:
  • A 3D model of a hollow transition section with:
    1. a rectangular entrance providing a "slip fit" over a commercially available 12 volt DC fan's exhast;
    2. a 45° change in direction; and
    3. an appropriately-sized circular exit providing a "slip fit" either within or over a commercially available Schedule 40 PVC pipe;
    4. appropriately-labeled and organized layers for all 2D and 3D geometric elements;
    and
  • A rendered perspective view of the final transition as a partial cross-section (nominally ¼ cutout to show adequate wall thicknesses) and 2D internal & external loft curves (see example below).
To walk you through the various processes required for completing Assignment 3.6, a set of procedures with detailed process instructions has been developed:
  1. Part A — Lofting Fundamentals: Developing a Simple Transition Section
  2. Part B — Developing a Straight Transition Plenum
  3. Part C — Getting Bent: Developing an Angled Plenum
Web site Copyright © 2000-2010 by Bill Hemphill   All Rights Reserved.
Jan. 22, 2010