4.212

Design Fabrication Design, Computation and

Computer Controlled Devices

Prof. Larry Sass Department of Architecture and Planning

MIT

LECTURE #5

[1] Assemblies

[2] Surface Divisions

Programming

1 Study of Square Footage

2 Study of Adjacencies

3 Programming Features

Schematics

1 Shapes

2 Shape Relationships

Space Surface [c][a]

Programming & Schematics

1 Shapes

2 Shape Relationships

3 Programming Features

[b]

Design Development

1 Designing Curve Surfaces

2 Assemblies

3 Design & Fabrication Systems

Components Construction Documentation

& Construction Admin

programming

Paperless

[1] [2] schematics

[3] design development

[4] construction documentation

[5] construction admin

[1]

Assemblies

Why Assemblies in Design?

close relationship to construction methods

opens the possibility for design break through by simulating new construction technique

Using rapid prototyping – monolithic parts takes the rapid out of rapid prototyping.

making smaller pieces to be assembled takes advantage of print technology

assembly in design returns control of designing details to the architect

Why Assemblies in Design?

Manufacturing

Craftsman – Pre 1870

Mass Manufacturing 1870 – 1945

Automated Manufacturing 1945CIM – Computer Intergrated Manufacturing Robotics and Automation

Manufacturing Concerns

Accuracy

Repeatability

Flexibility

Assembly Methods in Design

“design for assembly” Andreasen, Kahler and Lund

Assembly of Building Components using digital devices

Incorporate the natural features of CAM

Precise cuts

Control of tolerance

Variations in cutting and or build

Methods

Build in 3 dimensions

Fabricate in 2 dimensions

Learn the relationship of device to reality

tolerances

construction methods

study of a basic dome

10” 9”

assembly methods

b

c-cut sheet

Relationship to reality

division of surface and components

a+b = distance g a-design file

b-construction file

a g(x) = real distance

What is an design assembly process using rapid prototyping?

Divide the overall design into parts

Create components and subassemblies

Determine a base from which to build

Relationship of the device to reality

Strength of representation

Materials & Construction Methods

cut sheet - stratasys cut sheet – zcorp cut sheet – laser cutter

construction model

designmodel

testmodel

Surface geometry

Modeling Material Performance

Strength of representation

Materials & Construction Methods

Test Modeling

Short Print Times - Simple models – 20 – 40 mins print time

Test assembly, model strength and tolerance

Test Modeling

Short Print Times - Simple models – 20 – 40 mins print time

Test assembly, model strength and tolerance

Why Assemblies in Design?

allows for the improvement of quality

speed up construction time

reduction of waste

[2]

Surface Divisions

Factors in Dividing a Surface

Visual appeal

Construction methods

Cost of fabrication

Transportation

Erection

Camps of Curves Methods of Surface Division

Foster’s Camp Gehry Camp

1 Curves composed of 1 Clarity of Curves segments

2 Structure mirrors the 2 Rational structure mostly surface made of straight pieces

Surface geometry

Surface geometry

assembly geometry

3 - cap

2 - frame

4 - Acetate insert

1 - base frame

Method of assembly

3 - cap

Original geometry

complex geometry

Surface geometry