a Double Curved Surface:
Loft, Sweep 2, Network Surface, Edge Surface, Patch
Various Rhino commands were used for surface generation. The most successful were the ones that created the most double curvature while staying true to the edge curves, such as NetworkSrf.
Various Rhino commands were used for surface generation. The most successful were the ones that created the most double curvature while staying true to the edge curves, such as NetworkSrf.
-Sweep2
-Made by extracting IsoCurves from a Nurbs Surface
- Tolerance
-Higher discretization usually creates more error.
-High control of order
Mesh
-Mesh, Mesh Reduction
-Divides a surface into planar parts
- Higher discretization with more subdivisions
-Lack of control of order
Triangulation (mesh or manually)
-Triangulate Nonplanar Quads or can be done manually
-All pieces are flat
-More control of order
Rhino does not unroll double curved surfaces without any distortion.
Breaking a surface into less double curved strips, or small flat pieces (below)
We were able to unroll our panels with no distortion. This was not the case early in the semester
Organize these pieces onto sheets for the laser bed.
- you might wanna use the grouped surfaces to make the files rather than the duped edges so that we can keep the lables tied to them for as long as possible.
Then plot a stencil (with the material size edge boarder indicating the laser bed) to place the already CNC'd pieces on in the laser bed in exact positions. (We can just put a small piece of tape
Tolerance is the amount of errors allowed within a project. Some examples would be the distance between panels when assembed.
When unrolling, tolerance can allow us to be consistent with the amount of distortion that occurs.
A parametric modeling tool that has the power to exponentially increase design efficiency.
definition
Used to:
-Generate surface iterations
-Populate curves with tabs and other shapes
-Divide surfaces into UV curves
-Populate surfaces with apertures at adjustable radii
Later it was used to:
-Change any Nurbs surface to an adjustable number of developable strips (using Sweep2)
-Change any Nurbs surface to the one you see in the hallway (see definition later in the presentation)
definition
As the curves are added to the GH componant (above) and as curve positions in Rhino change (right) GH updates the surface live
This allows the number of strips (subdivisions) to be adjustable
Dividng the surface into segments using IsoCurves
Separating
alternating curves
Drawing line segments in between curves to create sweep objects
Separating straight lines that are on opposite ends of the surface
Sweep2, rails are the IsoCurves, Sections are the straight lines
Feild Trips
Pnuehaus, Rumford, Rhode Island
Hyperbole, Rhode Island College
The Pedestrian Bridge, Providence, Rhode Island
Take-aways - Clear labeling system, method of joinery, simulation testing to ensure the success of the built model
Grasshopper definition that transforms a nurbs surface into the final installation’s components
Surface Is divided into strips
The strips are triangulated, joined, and turned into a mesh
Disks populate the interior edges perpendicular to those curves
The mesh is offset and used as a trimming plane for the Disks
The triangles are scaled to a slightly smaller size, creating gaps inbetween each of them
Notches added at the intersection curves between each of the disks (now trimmed biscuits) and the panels
Holes trimmed at the vertex
Goals:
-Develop a form that reacts to the staircase in a way that it morphs around the slope of the stair.
-The form must have enough double curvature so that it mostly supports itself.
-Create a method of discretizing the surface into triangulated pieces.
-Create a surface that can easily be unrolled and nested.
Obstacles:
-Okoume plywood doesn’t flex the same way as Bristol Paper.
-Boundaries of the staircase and windows limited the habitable zone.
-After visiting RIC + The PVD Pedestrian Bridge it was clear that we needed a labeling system for a successful assembly process.
Both the staircase and the windows have a clearance allowance of 3’. The surface had to stay out of these boundaries while maintaining the “swoop affect.”
As a team, we agreed that this shouldn’t be something that a passerby would able to reach out and touch.
So working the surface around these boundary “planes,”became necessary.
The beams have lights attached very closely on the topside.
The amount of discretization limited our design shape.
Focused on developing joinery methods, performing material tests, and building physical models
-More rigid, keeps its flat shape
-Small issues with warping
-Flexible, strong memory, wants to lay flat
-Snaps easily, weak
-Easily bent, memory of bent shape
-Brittle core, “bending” is breaking
Every piece of the final model was cut on our own LC Series 4896 CNC Router. Cutting took just over one week.
The surface was split into 21 different groups that were clearly labeled in Rhino.
This made it easier to unroll and label all of the biscuits and panels. This file was passed around a lot so having it clear and conscise helped alot. The strips were individually seperated and unrolled along with being labeled accordingly.
All of the groups were then set into a matrix.
The biscuit nesting strategy was to have 1/4” gap between the biscuits at their closest point
The panel nesting strategy was to have at leat 1/2” between the panels at their closest point.
These strategies would ensure that we waste the least amount of material possible.
4’ x 8’ Okume sheets
Approx. 3 groups per sheet
’x 5’ (2: 2.5’ x 5’) Baltic Birch
Approx. 18 groups per sheet
Nested Rhino drawings were programmed to be cut by V-carve. Different bits require different toolpaths.
Careful consideration of material thickness, feed rate, spindle speed, number of passes, pass depth and more.
210 Panels were cut from six 4’x8’ sheets of 1/8” thick Okoume plywood. Each edge has two slots with a number matching a biscuit.
(1)90° V-Carve engraving bit
(2)1/8” Flat nose spiral bits
(1)1/4” Flat nose down-cutting bit
(8)4’x8’ sheet
578 Biscuits were cut out of one 5’x5’ sheet of Baltic Birch plywood. There are two of each biscuit with a respective angle and number.
(1)90° V-Carve engraving bit
(4)1/8” Flat nose spiral bits
(2)1/8” Straight flute bits
Baltic Birch (1)5’x5’ sheet
