CS 285: SOLID MODELING

Lecture #12 -- We Mar. 1, 2000.

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Preparation

  • Build your gear wheel generator

    Fabricating an Escher Ball

    Review the latest fabrication results.

  • Jane Yen: Fish or Starfish ?

    Gear Design

  • Look at gear wheel designs from phase 1
  • Review of some of the geometrical constraints
  • Discussion of implementation tricks
  • Fabrication of gear wheels on FDM machine (horizontal!)

    Bevel Gear Design

  • The virtual gear wheel in the "plane of action"
  • Unwinding it onto the back cone
  • Conical extrusion to common front cone center
  • Clearences
  • The support structure for the beveled cogs

    Design of a Gear Cluster

  • Choosing a suitable base polyhedron
  • Determining the bevel angles
  • Determining the gear ratios
  • How can these ratios be adjusted
    -- case of a planar two-wheel lattice
    -- case of a polyhedral three-wheel cluster

    Support Base Design

  • Polyhedron to support the axles
  • "Bearings" for the wheels
  • Keeping the wheels on the axles
  • Other design issues ??

    Course Project Ideas

  • Model the core geometry of the Wankel engine
  • Model a hyperbolic gear wheel pair between two skew axes

    Current Homework Assignment:

    A#4: Gear Design -- (phase 2)

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