WELCOME!

Attendance

About me

Your turn: Name, year at ITP, background, why you are taking this class

Syllabus (take a vote on midterm presentation)

Theo Jansen video: "The walls between art and engineering exist only in our minds"

Similar kinetics, easier to wrap your brain around: paper horse

Theme for semester: Abundance and Constraints

Expectations

• No Laptops
• Show up, participate, ask questions!
• Required: Create a student page. This can be posts just for this class or a link to an external site/blog.
• Attend a shop safety session if you didn't do so in the fall
• Sign up for 2 days of shop cleaning (Shop Cleaning Sign-up, What Clean Means)
• You need Windows to run the CAD program we will use in this class. If you have a PC, great. If you have a Mac, look here for options, and here for a nice comparison chart. Also, I need beta-testers for the CodeWeavers support. Become an advocate and get free software!

CAD Exploration

• Alibre Design Xpress My favorite! Can handle assemblies and 2D drawings. Windows only.

Worth mentioning...

• avoCADo Early version of open source 3D CAD software
• blender Not the best for simple 3D part design but can export .stl files
• Google Sketchup Good for 2D and some 3D, gear plugin
  • OhYeahCAD Free sketchup downloads, gear plugin
• eMachineShop Free software, can't export but can make to order

Fabrication Options

• ITP Machine Shop
• Glide Design CNC table
• AMS Laser cutter and 3D printer
• Rapid Prototyping
• Other Resources and map

What is a machine?

Any device that helps you do work, from a hammer to a typewriter. Uses of machines:

• Transform energy - generator
• Transfer energy - drive train
• Multiply/change direction of force - pulleys
• Multiply speed - bicycle

SIX SIMPLE MACHINES:

1. Lever
2. Block and Tackle
3. Wheel and Axle
4. Inclined Plane and Wedge
5. Screw
6. Gear

Others will say 1) Lever, 2) Wheel, 3)Inclined plane/slope, 4) Screw, 5) Wedge
OR
1) Lever, 2) Wheel, 3) Wedge, 4) Pulley, 5) Inclined plane, 6) Screw
Purists will say only the lever and the inclined plane exist.

Complex machines are just combinations of 2 or more simple machines
We will explore a lot of these by using the Motorized Simple Machines LEGO sets in the ER

Levers: "Give me a long enough lever and a place to stand and I will move the earth" -Archimedes

Materials

Materials Resources

• Metals

Pure or alloy. Non-localized electrons: good conductors of head and electricity. Strong yet deformable.
Steel: SS have at least 12% chromium. Plain carbon steels have iron, carbon, manganese, silicon, sulfer, phosphorous. Alloys may also have nickel, molybdenum, vanadium, tungsten.
Aluminum: great strength to weight ratio
Copper: great conductor, cheap
Silver: better conductor but more expensive, relatively easy to form

• Ceramics

Compounds between metallic and nonmetallic elements (oxides, nitrides, carbides). Ex. - clay, cement, glass.
Insulative to electricity and heat. Resistive to high temps and corrosion from harsh environments. Hard but brittle.

• Polymers

Plastic and rubber materials. Mostly organic (carbon containing) compounds. Large molecular structures, low densities, flexible.
Thermoplastic: can be molded and remolded when heated, will return to original form
Thermoset: cannot be remolded (bowling ball, football helmet)

• Composites

Consist of more than one material type (ex. fiberglass). Designed to display a combination of desirable characteristics. Ex. - Airbus A380, composites decrease jet lag?

• Semiconductors

Electrical properties intermediate between electrical conductors (metals) and insulators (ceramics). Made IC's possible (dissipative but not conductive).

• Biomaterials

Nonviable material used in a medical device, intended to interact with biological systems.
"Biocompatibility is the ability of a material to perform with an appropriate host response" - Williams, 1987
Representative list: titanium, stainless steel, PMMA, Teflon, silicone. Keep in mind for wearable technology: skin allergies, wearable-ness, comfort.

• Wood

Guest Lecture: Lauren Schmidt from Kohn Pedersen Fox Associates
She will talk about fastening techniques and construction tips and tricks

Stress and Strain

Assignment