Workshop
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Transcript of Workshop
![Page 1: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/1.jpg)
![Page 2: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/2.jpg)
Cutting & Packing Workshop
Spring 2008
![Page 3: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/3.jpg)
Furniture Manufacturing
![Page 4: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/4.jpg)
Wooden Frame
![Page 5: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/5.jpg)
Wooden Frame
![Page 6: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/6.jpg)
![Page 7: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/7.jpg)
Wood Cutting
![Page 8: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/8.jpg)
Fabric Cutting
![Page 9: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/9.jpg)
Foam Cutting
Movie: http://www.youtube.com/watch?v=-CnUjwqKUDw
![Page 10: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/10.jpg)
Assembly
Assemble wood frame & springs
Cochins and Textile cover
![Page 11: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/11.jpg)
2D Cutting
Wood
Metal
Textile
Foam
![Page 12: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/12.jpg)
CNC Router
Heads
Hold-down system
Tables
Tool changerController
![Page 13: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/13.jpg)
Accu-Router Movie
![Page 14: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/14.jpg)
Fabric Cutting
![Page 15: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/15.jpg)
What does it have to do with computational geometry
Given a set of 2D shapes (polygons):
place the shapes on a material such that they will not intersect.
Variant #1: Use infinite roll with a given width.
Variant #2: Use sheets of material with a given width and length.
Optimize your solution to use as little material as possible.
![Page 16: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/16.jpg)
Business Value - Example
Bassett Furniture (http://www.bassettfurniture.com)
$300M in revenue per year
13 routers
Cuts ~650K sheets for ~650K frames.
$13M cost of wood
$26M cost of foam (outsourced)
$26M cost of fabric
Total $65M material
Saving 5% wood material = $650K per year
![Page 17: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/17.jpg)
Different approaches to the nesting problem
Manual nests (or semi automatic):Human made
Automatic nestsSoftware made
Static nestsNest few kits and use the same nest again and again
Dynamic nests
![Page 18: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/18.jpg)
Dynamic approach
Advantages:Nest according to demand.
Nest the exact amount of needed parts.
Support custom styles.
Mix different jobs of the same material.
DisadvantagesA lot of nesting work – requires software.
Each nest is different – sometimes cause difficulties in production process.
![Page 19: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/19.jpg)
Example – build you own furniture
http://www.bassettfurniture.com/tools/custom-upholstery/custom-upholstery.asp?type=loft
![Page 20: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/20.jpg)
Additional Options
Keep grain direction: part cannot be rotated.
Stripes and plaids
![Page 21: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/21.jpg)
Additional Options (cont.)
Hold-down systems & cut order (wood)
Vacuum
Rollers
Flexible
Fires (cut path)
Movie: http://www.youtube.com/watch?v=-CnUjwqKUDw
Foam (cannot leave material during cut)
Stacking (foam) – Cut time/ efficiency trade-off
Leather – quality areas
![Page 22: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/22.jpg)
Metal cutting – Laser Machines
![Page 23: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/23.jpg)
Laser cutting
Movie
Restrictions:Heating
Tabs – holding small parts
Small parts first
![Page 24: Workshop](https://reader033.fdocuments.us/reader033/viewer/2022061218/5481781eb4af9fe0328b4681/html5/thumbnails/24.jpg)
Metal Cutting – Waterjet machines