Part Description and Specifications for
"Heptagonal Toroid"
This is a toroidal ring of seven 4th order saddles.
It is the latest collaborative sculpture between
Brent Collins and Carlo Séquin.
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Origin
This part was generated with Carlo Séquin's
sculpture generator, using the following settings:
- branches = 4
- storeys = 7
- height = 1.00
- flange = 1.10
- twist = 135.00
- azimuth = 0.00
- thickness = 0.05
- rim_bulge = 0.00
- detail = 6 {--> 18,816 triangles}
Usage
This part will serve as a geometrical scale model
for a sculpture that I am jointly developing with
Brent Collins, a wood sculptor living in Gower, Missouri.
It might get exhibited together with its corresponding wood sculpture
in an exhibit at the of June 1997.
This experiment is also part of a research program sponsored by NSF
to streamline the process of rapid prototyping of free form parts,
by defining a clean interface between designers and fabricators.
Fabrication Hints
The scale or strength of this model is not critical;
it can be scaled so as to fit optimally a particular process
or some remaining space in a run of a larger piece.
The STL files describe a part
with a diameter (in x) of 67,000 units
and a thickness (in y) of 24,000 units.
The surface walls are 1000 units thick.
Ideally we would like a part several inches in diameter.
This could be achieved by interpreting each unit to mean 0.1 mils.
Orientation is not critical either.
However, for a layered manufacturing process (SLA, SLS, etc),
it might be best to
turn the object 90 degrees around the x-axis,
thereby giving the part minimal height,
and preserving its 3-fold symmetry ideally.
Part Description Files:
Compressed Berkeley UniGrafix description of Heptagonal Toroid (heptoroid.ug.gz).
Compressed ASCII .STL file: heptoroid.stl.gz (0.58MB)
Large compressed files can be downloaded from our anonymous FTP site with:
ftp ftp.cs.berkeley.edu
{login as "anonymous"; use your full e-mail address as password.}
Then change directory: cd ucb/projects/unigrafix/STL
Fetch desired files: get heptoroid.stl.gz
The heptoroid.stl.gz file can be uncompressed with gunzip.
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Page Editor:
Carlo H. Séquin