Sakura_Transformable bar

SAKURA Transformable Bar

A4824 Transformable Design Methods Columbia University GSAPP Fall 2014

Columbia University GSAPP Fall 2014

Contents 1. abstract

: Introduction of sakura 2. geometry

: expanding wheel structure 3. Design process

: initial proposal and Final design 4. interactive diagram

: usage of sakura 5. construction : details of connection and assembling process

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Sakura

Team Hoberman Sunghee Cho Sareeta Patel Ekkaphon Puekpaiboon Yuko Sono Yunhak Sim

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Columbia University GSAPP Fall 2014

She is elegant.

Structurally sound.

Curved in all the right places.

She is over 21 years old, and enjoys a beer or two.

abstract

introduction of sakura

Sakura is a eight feet wooden structure that transforms from a compact slender form into a semi-private self supporting interactive pavilion. Based on Chuck Hoberman’s wheel, we aimed to create an engaging visual and inhabitable pavilion. Sakura, has three levels of transformations, all independent to one another. She starts off with a seating component on the first level, moves to a counter top in the middle, and ends with a bottle rack at the top. Each segment can be operated in a single manner or be combined to create various profiles.

Whatever you want, here are the Possible Combinations_ _Seating _Counter Top _Bottle Rack _Seating + Counter Top _Seating + Wind Rack _Counter Top + Wine Rack _Seating + Counter Top + Wine Rack

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Sakura

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Columbia University GSAPP Fall 2014

Geometry_dodecagon

Scissor_add linkage

Geometry

Expanding Wheel Structure

Spoke Element_add linkage

As shown basic geometry above, the geometry of the Hoberman wheel can achieve expandable and retractable structure. We believe that the wheel structure is a perfect geometry for making transformable bar or pavilion. Due to our aim to build full-scale structure which can be interactive with people, it is imperative to understand 6

how this geometry works. The distance between each joint on the inner and outer circle must keep same value and the radius of the inner circle needs to be half value of the outer circle. Moreover, to achieve technical clearence, the joints have to keep on same horizontal plane.

Sakura

Angulated linkage : kinetmatic

Designing Area

Linkage Component

When the critical principle of wheel structure is kept without any changes on the geometry, the component, as you see picture above, can be designed by adding specific functions for transformable bar. To be specific, the component will be modified by having a certain height or shape such as curvature. It means that

there are a lot of possiblities to design each components based on the initial prototype of wheel structure. Then, we start to jump into designing process on our transformable bar with three main functions; seating, bar counter, and hanging shelves.

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Columbia University GSAPP Fall 2014

UNITS TOP

MIDDLE

BOTTOM

Hanging Shelf

Bar Counter

Chair

Top

Hanging Shelf

Middle

Bar Counter

Bottom Chair

design process initial proposal

Initial Design

Bottom part 8

Sakura

stage 1

stage 2

Before constructing full-scale model, we decide to test whether our design is working well on the wheel structure. First of all, we test our stucture on 3d modeling software, Rhino. Then, we try to make 1/3 scale model to make sure whether the model is physically working with the geometry. During this process, we figure out how to provide people comfortable usage of the bar on human scale. Finally, this process keep changing our bar design.

As you can see the images on the left side, those designs are our initial design and the image above refers design process of the transformable bar.

stage 3

stage 4

1/3 scale model

In addition with design issues, this process can allow us to identify structural issue. We need to deeply consider the strength of structure to achieve smooth working condition and the stress on each components such as linkage and central structure bar. Since our desire is to put vertically three layers and to resist each layers, central structure part is pretty important with weight calculation. The total weight of this structure is almost 200 lbs.

The connection detail will be specifically mentioned on page 14 and 15.

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Columbia University GSAPP Fall 2014

7’

3.25’

final design

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3.50’

7.5’

design process

Sakura

full scale construction

Withe testing several full-scale linkage models, we make eight feet tall structure with sanded 3/4 “ thickness plywood. When this structure is extracted, the radius is up to seven feet and when this structure is retracted, the radius is three feet. In terms of functions, as mentioned on abstract section, Sakura, has three levels

of transformations, all independent to one another. The bar starts off with a seating component on the first level, moves to a counter top in the middle, and ends with a bottle rack at the top. Each segment can be operated in a single manner or be combined to create various profiles.

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Columbia University GSAPP Fall 2014

interactive diagram usage of sakura

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Sakura

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3 4

1. Top, Hanging shelf 2. middle, counter bar 3. bottom, chair 4. middle, counter bar

All the images on this page are showing the usage of the bar and how people interact with this structure. Due to the bar’s interacting function with people, it is imperative to achieve a certain structural strength. By constructing with 3/4� plywood, the strength of structure is pretty sturdy especially on seating components.

The other components are working well.

Also, the wheel geometry can achieve the balance of stress itself by increasing stability. Thus, there is no structural weakness to operate this transformable structure.

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Columbia University GSAPP Fall 2014

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Connection

construction

details of connection

Connection

To achieve smooth operation and to distribute stress to the other parts, the joint or connection details are critical points on this structure. When you see the connection detail 1, that is for the linkage by using butt joint. It allows to make strong connection without any gluing. Also, the connection detail 2 is for the joint to hori14

zontal connection and it makes each parts rotating well. When the shape is extracted or retracted, this joint plays an important role to make it possible and we use 18 mm diameter aluminum pipe to make this joint strengthen and smooth.

Sakura

Joint Detail Butt Joint

3/4" Thickness

Joint hole

Connection detail 1

Cap Screw

D = 0.3125"

Steel Washer Plexi Washer 1/4" Thickness

Aluminum Pipe

Cap Screw Connection detail 2 15

Columbia University GSAPP Fall 2014

construction

details of connection

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Sakura

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1. cnc milling 2. detaching 3. sorting 4. assembling 5. sanding 6. components 17

Columbia University GSAPP Fall 2014

construction assembling

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Sakura

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1. joint hole sanding 2. connection 3. connection 4. assembling 5. assembling disk 6. testing 19

Columbia University GSAPP Fall 2014

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Sakura

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Columbia University GSAPP Fall 2014

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Sakura

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Columbia University GSAPP Fall 2014

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Sakura

Team hoberman

sunghee cho

sareeta patel

gear ekkaphon puekpaiboon

yuko sono

yunhak sim

: M. arch 15'

: m. arch 15'

: m. arch 15'

: m. arch 15'

: ms. aad 15'

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SAKURA Transformable Bar

A4824 Transformable Design Methods Columbia University GSAPP Fall 2014 all rights reserved by yunhak sim