### System Design Review

```P15482: Breadfruit
Shredder and
Grinder
Brittany Griffin, Sam Huselstein, Alan Kryszak, Pat Connolly, Andrew
Beckmann
Agenda
Quick Background
- Updated Engineering Requirements
- HOQ
System Design
- Functional Decomposition
- Energy Flow
- Benchmarking
- Concept Generation
System Design Selection
- Selection Criteria
- Concept Selection
- Feasibility Analysis
- Architecture
Risk Assessment
Updated Project Plan
Quick Background
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●
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Haiti
Breadfruit
FouFou
Shredder and Grinder
Customer Requirements
Customer Requirements
Engineering Requirements
Engineering Requirements
F1 = Contain Breadfruit
F2 = Collect Processed Breadfruit
F3 = Shred Breadfruit
F4 = Grind Shreds
Feasibility
Question: How much flour can be made from one breadfruit?
Assume: Breadfruit is 70% water by weight, peel and core weigh approximately 0.2lb, shreds are
completely dry (100% water reduction)
Analysis:
3 breadfruit = \$10.00
1 breadfruit = \$1.98
Therefore: 1 breadfruit = 1.67lb
1.67lb * 0.7 = 0.5lb of dried fruit
0.5lb – 0.2lb = 0.3lb
One breadfruit yields approximately 0.3lb of flour.
HOQ
This format only allows 25 ER’s...we will need
to reformat or eliminate some ER’s to make a
complete HOQ.
Functional Decomposition
Critical!
Shredder Decomposition
Grinder Decomposition
Energy Flow
Benchmarking for Functions-Shred
Ribbon Fry Cutter
http://images.zesco.com/pimages/518/518-d-039.jpg
Apple Peeler
http://ecx.images-amazon.com/images/I/7185U2IiWPL._SL1500_.jpg
Benchmarking for Functions-Shred
Shredding Rollers
Blade Array
http://www.lenzingtechnik.com/fileadmin/_processed_/csm_grobhomogenisator_01_fc818f2f51.gif
http://www.chefscatalog.com/img/products/285x285/99884_285.jpg
Benchmarking for Functions-Shred
Apple Peeler with Cutter
http://en.wikipedia.org/wiki/Cam#mediaviewer/File:Nockenwelle_ani.gif
http://tclauset.org/16_StGuides/ch13/picts/applepeeler.jpg
Benchmarking to Function - Grind
Roll Crushers
http://www.scribd.com/doc/30156582/Chapter-6
Benchmarking Functions - Grinder
Mortar and Pestle
Hammer Mill
http://i.ebayimg.com/00/s/NjUwWDY1MA==/z/DNoAAOxygPtS5q4j/\$_35.JPG
http://www.responsiblebusiness.eu/download/attachments/2588750/hammer+mill.jp
g
Benchmarking Functions - Human Power
Bike Power
Hand Crank
http://www.lowtechmagazine.com/2011/05/pedal-powered-farms-and-factories.html
http://www.prestowind.com/store/image/39og3/Hand_Crank_Generators_-_Wind_Generators__Survival_and_Emergency_Products_Crank-a-Watt_TM_Deluxe.jpg
Concept Generation
Concept Generation
Concept Generation
Selection Criteria
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Doesn’t use electricity
Available in Haiti
Easy to maintain/sharpen cutter
Effort required to operate
Easy to understand
Within budget
Peels and cores (bonus)
Pugh Diagram Round 1
Datum
Alan 1
Alan 2
Alan 3
Andrew 1
Andrew 2
Andrew 3
Sam 1
Sam 2
Sam 3
Brittany 1
Brittany 2
Pat 1
Pat 2
S
+
+
S
+
-
S
+
S
+
S
+
-
S
+
S
S
-
S
S
+
+
S
S
+
S
+
+
S
+
-
S
+
S
S
-
S
+
S
+
S
-
S
S
+
+
S
S
-
S
+
S
+
S
+
-
S
S
+
+
+
S
-
S
S
+
+
S
-
S
+
-
S
S
+
+
-
Sum +
3
3
1
3
3
1
2
2
3
3
2
1
2
Sum S
2
3
3
4
2
3
3
4
3
3
3
1
2
Sum -
2
1
3
1
2
3
2
1
1
1
2
5
3
MET
Does it use
electricity?
Avail. in Haiti:
Shredder
Avail. in Haiti:
Grinder
Easy to maintain
& sharpen
/
/
/
/
Effort to operate
/
Easy to
understand
/
Within Budget
/
Peels & Cores
(Bonus)
/
Feasibility
Question: Will grinding rollers need to be replaced?
Assume: Industrial rollers can be compared to style used by team, rollers used constantly for 3
months/year, Force from industrial motor > force generate from human power
Analysis:
Team goal: Product life of greater than 3 years.
2 Manufacturers contacted through phone.
Rollers in mills must be replaced after several years in industrial applications
Since our application will only have heavy usage for 3 months every year and with less force than
used in industrial applications, it is safe to assume the rollers used in our design will not need to be
replaced during the lifetime of the product.
Feasibility
Question: Will the grinder used in Pat 2 be cost effective?
Assume: Grinder type already exists, online specifications are accurate
Analysis:
Country living grain mill
Material:
high carbon steel burrs – should not need to be replaced
Advantages:
•
Will not gum up if shreds are too moist
•
Adjustable coarseness
•
Easier than stone grinders
Disadvantages:
•
Will not grind as fine as ceramic grinders
•
Slow and tiring when done by hand ** not as heavily weighted
Cost for new set of grinders: \$91.47
Feasible: This is a feasible design, however, would be more costly than other options
www.onlygrainmills.com/country-living-grain-mill/
www.einkorn.com/grinding-einkorn/
Feasibility Analysis
● How much force is required to grind dried breadfruit?
●
Once a particle size is selected we can estimate the grind roller capacity and the force needed to
crush the particles.
https://html1-f.scribdassets.com/18nnuf2o1sjeg0m/images/3-9d3751ac00.png
Pugh Diagram Round 2
MET
Alan 1
Alan 2
Andrew 1
Andrew 2
Sam 1
Sam 2
Sam 3
Brittany 1
Brittany 2
Pat 2
Does it use
electricity?
Avail. in Haiti:
Shredder
Avail. in Haiti:
Grinder
Easy to maintain
& sharpen
/
S
S
S
S
S
S
S
S
Datum
S
/
+
+
+
+
S
S
+
S
Datum
S
/
S
+
S
S
S
S
+
S
Datum
S
/
+
+
+
+
S
+
+
S
Datum
S
Effort to operate
/
-
-
+
-
+
+
-
+
Datum
+
Easy to
understand
/
S
-
S
S
-
S
S
S
Datum
S
Within Budget
/
+
S
S
S
S
-
S
S
Datum
-
Peels & Cores
(Bonus)
/
S
S
+
S
S
S
S
S
Datum
S
Sum +
3
3
4
2
1
2
3
1
Datum
1
Sum S
4
3
4
5
6
5
4
7
Datum
6
Sum -
1
2
0
1
1
1
1
0
Datum
1
Pugh Diagram Round 3
Andrew 2
Sam 2
Sam 3
Team 1
Team 2
APPLE PEELER w/
RIBBON FRY Hand
Trimming
Crank. Pedal
mechanism AND
POWERED
ROLLERS;
ROLLERS
HANDCRANK
Does it use
electricity?
Avail. in Haiti:
Shredder
Avail. in Haiti:
Grinder
Easy to maintain
& sharpen
/
S
DATUM
S
S
S
/
+
DATUM
+
+
+
/
S
DATUM
+
S
S
/
S
DATUM
+
+
+
Effort to operate
/
-
DATUM
-
-
-
Easy to
understand
/
S
DATUM
S
S
S
Relative MSD cost
/
S
DATUM
+
+
+
Peels & Cores
(Bonus)
/
S
DATUM
+
+
S
Sum +
1
DATUM
5
4
3
Sum S
6
DATUM
2
3
4
Sum -
1
DATUM
1
1
1
Selected Concepts
Architecture
Team 1: Apple peeler with trimming mechanism and grinding rollers
MSD team
Hand crank Overall machine
structure
Haitian farmers
Haitian farmers
Shredder
Container
Grinder
Container Quality test
Architecture
Sam 2: Shredding rollers and Grinding rollers
MSD team
Haitian farmers
Haitian farmers
Shredder
Container
Bike power
Grinder
Container
Quality test
Overall machine
structure
TRIZ
● Mechanical mortar and
pestle
Benchmarking:
● Highly technical design
● Uses motors
● High quality (expensive) materials
Quick Feasibility:
● Difficult to make tolerances needed
● Difficult to scale to larger size
● Materials most likely will not be available
in Haiti
● Design would be robust and would need to
be prototyped to determine if flour quality
grain sizes are plausible.
http://www.retsch.com/uploads/sl/23747f6755854fd697495c7a8201dd93.jpg
Risk Assessment
Risk Assessment
Updated Project Plan
What could we learn from a trip to Haiti?
● Possible market value of our product
● Most/Least popular aspects about our design
● What type of environment our product will spend a majority of its life
● What materials are actually available in Haitian markets
Questions?
• Do you have any design
concerns?
```