3d printing in the classroom copyright © 2012 board of trustees, university of illinois. all rights...
TRANSCRIPT
3D Printing in the Classroom
Copyright © 2012 Board of Trustees, University of Illinois. All rights reserved. Last modified 2/10/12
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Today
• Learn about creating nano-sized 3-D objects• Learn about polymerization and how it can be
initiated by light• Learn how to use this technology to create
3-D objects
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Micromanufacturing
• Current micromanufacturing methods make relatively flat objects.– Alignment of layers hard to
achieve– Process very complex and
expensive
• Flat objects called 2-D or 2.5-D
The Challenge: Lack truly 3-D microfabrication methodsThe Challenge: Lack truly 3-D microfabrication methods
Example of 2.5D objects
The Solution: Microstereo LithographyThe Solution: Microstereo Lithography
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Micromanufacturing• Micromanufacturing refers to methods used
to create structures of micrometer sizes or smaller.
One micrometer, or micron, is one-millionth of a meter ( )
One nanometer is one-billionth of a meter ( )
1.0x10 6m
1.0x10 9m
50 microns
Micro Gears Photonic Crystal Bioreactor
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3-Dimensional Printing
• Work of Professor Nicholas Fang in nanoscale optical imaging
• Idea is to mimic a complicated and expensive lab setup in an inexpensive way.
• Uses equipment normally found in a school classroom.
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3-Dimensional Printing
• So, can’t take $ 500,000 machine into classroom – what can students do?
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3-Dimensional Printing
computer with PowerPoint image
data projector
magnifying glassmirror
elevatorproduct (3-d object)
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Light-Activated Polymer
• uv light reacts with initiator to create two radicals.
• Radicals each have single free electron.
+
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Light Activated Polymer
• Radical bonds with monomer.
• Now single free electron at end of chain
+
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Light Activated Polymer
• Repeats until two ends with free electrons interact and bond.
+
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Elevator Design
• Drawer slide provides smooth movement.
• T-nut and threaded screw controls motion.
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Slicing the 3D Object
• 3D objects are constructed by slices.
• Overlapping between layers is generally required.
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Overhanging Structures?
• Amount of Sudan I determines thickness of layer. Optical
absorptiondepth
Opticalabsorptiondepth
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What to Do
• Make black/white images.
• Set up system.
• Print!
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Slicing the 3D Object
• Create each different slice.
• Add blank slide to advance elevator.
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Sample
• To make a rectangular box…
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Sample
• To make a rectangular box…
Repeat this slide to make a taller rectangular cube
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Alignment is Important
• Be sure each slide aligns.
• To align - copy slide, make modifications.
• Check properties.
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Preparation Slides
• Polymer reacts with uv light.
• Polymer does NOT react with red light, but we can see red.
• Red is good color to use for preparing an apparatus.
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Focus Slide
• Use a red complex image to focus.
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Alignment Slide
• Make a red version of the largest image to align.
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Instructions
• Use red text for instructions.
Repeat 25 times
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Final
• Put these elements together in one file.
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Examples of Objects
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Examples of Objects
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Examples of Objects
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Examples of Objects
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Examples of Objects
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Examples of Objects
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Examples of Objects
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Examples of Objects
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Using Math
Student Objects
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Student Objects
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A Different Application!
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One Layer at a Time
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Mathematical Sculpture
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Mathematical Sculptures
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The Holy Grail
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Engagement Ring!
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