CS 294-3: RAPID PROTOTYPING
Lecture #3 -- Sep. 15, 2000.

Discussion of Results of Assignment A#2

• What kind of knots did you design ?
• How did you do it ?

Fabrication Accuracy in SFF

• Discussion based on last section in: "The Use of Solid Rapid Prototyping in Computer Graphics and Scientific Visualization" --
  On-line course notes by M.Bailey from Siggraph'96.

More on Designing with SLIDE

• Fancier sweeps
• Use of symmetry

Preparing for FDM: QuickSlice

• See also Hints and Experiences in the Use of Quickslice.

Running the FDM Machine

• Synopsis of the operating instructions for the FDM machine.
• See also Diagram of the FDM process.

Homework Assignment:

A#3: Design parts with six-fold rotational symmetry:
e.g., a flower, vase, propeller, gear wheel, abstract sculpture, ...

• Using SLIDE, advanced sweeps (perhaps using warps or morphs) design a simple shape, perhaps with 2-fold symmetry; then place 6 instances of that shape symmetrically around an axis to make an object with 6-fold symmetry.
• Depending on the shape and orientation of the master instance, the resulting object can belong to one of 7 possible symmetry groups, - - in this case to the right-most column in the survey chart. Those 2 classes of 3D rotational symmetry groups can be derived from the 7 types of linear Friezes by wrapping 6 copies of these frieze tiles cylindrically around a vertical axis.
• Make seven simple conceptual objects that all belong to different symmetry groups, and for each capture a picture and label it with the symmetry group name.
• Make one more elaborate object of the group of your choosing, suitable for FDM fabrication. Also capture a picture of that design and save a suitable STL file in a public_html directory.

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