Engineering Design 100 Project 1
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Transcript of Engineering Design 100 Project 1
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Engineering Design 100
Project 1
Claire Nowak
Sean Busko
Joel Croce
Changju Park
February 26, 2013
Design Team 1
Abstract:
The objective of this project was to design a more sustainable automated toothbrush. We were
first given a sample toothbrush to look at and analyze; we took into consideration everything
from the packaging to the size of the toothbrush head. We then assessed customer needs and
came up with a revised problem statement according to the customer needs. Next came the
research to find out more about the product we would be creating. We looked up various patents
and designs for products similar to the one we would be making. We used the information for the
competitors products to benchmark and assess what we liked and didnt like in the other
designs. Next we completely took apart out sample toothbrush and assessed the parts. After that,
we had to develop concepts for our product based on the customer needs. At this point in the
process, we decided to go with a rechargeable design as opposed to a battery-operated one. We
also made other decisions about the design through our analysis of the concepts we came up
with. To complete the project, we just had to make drawings of our design and explain in detail
how all the components came together in the finished product. This report outlines all the steps
we took in creating our finished product.
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1.0 Introduction1.1 Initial Problem Statement
We feel that todays electric toothbrushes could be more sustainable and environmentallyfriendly. Our task is to make a new electric toothbrush that is green and user friendly, while still
being a reasonable price. We are going to specifically focus on the power source to make the
toothbrush greener and assess customer needs to decide the final design for the product.
2.0 Customer Needs
2.1 Weighing Customer Needs
It is important to create a focus group to find out what specific needs customers are looking for.It is even more important to weigh these needs to determine what functions should appear in
your final design. We interviewed 20 people about what they were looking for in an electric
toothbrush and used their answers as the customer needs we were going to investigate.
Table 1. Initial Customer Needs List Obtained from Interviews
PortableLightweight
Comfortable to holdSafeAdjustableCompactCustomizableLow noiseEasy to operateCost of maintenanceBattery LifeStrengthGentle
Rechargeable BatteryEffective at CleaningDurableCost Effective
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Table 2. Hierarchal Customer Needs List Obtained from Interviews
1. Portable1.1 Lightweight1.2 Comfortable to hold
1.3 Adjustable Head1.4 Compact2. User friendly
2.1 Customizable2.2 Safe2.3 Easy to Operate2.4 Low noise
3. Durable3.1 Cost of maintenance3.2 Battery Life3.3 Strength
4. Functions4.1 Gentle4.2 Rechargeable4.3 Effective at cleaning
5. Cost Effective
Figure 1. AHP Pairwise Comparison Chart to Determine Weighting for Main Objective
Categories
Portable UserFriendly
Durable Functions CostEffective
Weighted
Portable 1 1/3 1/5 1/7 1/9 .03
Cost Effective 3 1 1/4 1/5 1/7 .079
Durable 5 4 1 1/3 1/5 .18
User Friendly 7 5 3 1 1/3 .28
Functions 9 7 5 3 1 .43
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Figure 2. AHP Pairwise Comparison Chart to Determine Weighting of Portable Sub-
Objectives
Lightweight Comfortableto Hold
Adjustable
HeadCompact Weighted
Lightweight 1 1/3 1/5 1/7 .052
Comfortable
to Hold3 1 1/3 1/6 .138
Adjustable
Head5 3 1 1/3 .287
Compact 7 6 3 1 .52
Figure 3. AHP Pairwise Comparison Chart to Determine Weighting of User Friendly
Sub-Objectives
Customizable Quiet Safe Easy to
Operate
Weighted
Customizable 1 1/3 1/5 1/7 .052
Quiet 3 1 1/4 1/5 .138
Safe 5 4 1 1/3 .317
Easy to
Operate
7 5 3 1 .49
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Figure 4. AHP Pairwise Comparison Chart to Determine Weighting of Durable Sub-
Objectives
Cost of
Maintenance
Battery
Life
Strength Weighted
Cost of
Maintenance
1 1/3 1/7 .08
Battery Life 3 1 1/5 .225
Strength 7 5 1 .695
Figure 5. AHP Pairwise Comparison Chart to Determine Weighting of Functions Sub-
Objectives
Gentle Rechargeable Effective at
Cleaning
Weighted
Gentle 1 1/5 1/7 .062
Rechargeable 5 1 1/6 .2868
Effective at
Cleaning
7 6 1 .65
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Table 3. Weighted Hierarchal Customer Needs List Obtained from Interviews
1. Portable (.03)1.1 Lightweight (.052)1.2 Comfortable to hold (.138)1.3 Adjustable (.287)1.4 Comfortable to hold (.52)
2. User friendly (.29)2.1 Customizable (.052)2.2 Safe (.138)2.3 Easy to Operate (.317)2.4 Low noise (.49)
3. Durable (.18)3.1 Cost of maintenance (.08)3.2 Battery Life (.225)3.3 Strength (.695)
4. Functions (.43)4.1 Gentle (.062)4.2 Rechargeable (.2868)4.3 Effective at cleaning (.65)
5. Cost Effective (.079)
3.0 Revised Problem Statement
Our original task was to create a more sustainable and user friendly toothbrush. We are goingto specifically focus on making a toothbrush that is rechargeable and does not require batteries.This will reduce waste and eliminate the need to spend money on batteries. We are also going tofocus on making a toothbrush that cleans well and is made out of durable material.
4.0 External Search
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4.1 Literature Review
4.2 Patent Search
Function Art
Kinetic Plate
Moveable
Head Sections
PoweredToothbrush Bristle
Pattern
Capacitive
on/off Switch
Motor Driven
Rotary
Rechargeable Battery US7140058
Toothbrush Head US7117555 USD477715
Toothbrush Body US5453644
Operating Mechanism US2124145
4.3 Benchmarking
Table 5. Benchmarking of Four Products
Feature Oral-B Advanced
Power 400 TX
Colgate 360 Sonic Oral-B Professional
Care 1000
Sonic Spin Brush
Packaging 3 3 4 3
Aesthetics 3 5 4 4
Ease to clean 4 4 4 4Convenience of on/offswitch
5 5 5 5
Effectiveness atcleaning teeth
4 2 5 4
Rechargeable 0 0 5 5
Gentle 3 3 5 4
Cost 0 4 3 4
Durability 4 2 5 3
Lightweight 4 5 3 3
4.4 Product Dissection
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4.4.1 Product Measurement
Location Noise Level
Brush Head 4 inches away 69.8 db
Brush head 3 inches away 70.2 dbBrush head 2 inches away 71.5 db
Brush head 1 inch away 72.1 db
DC motor 4 inches away 67.2 db
DC motor 3 inches away 68.4 db
DC motor 2 inches away 68.7 db
DC motor 1 inches away 69.2 db
Approximate duration of daily brushing 4 minutes
Average noise during brushing 69.6 db
Part Number Material/ Function Weight
1 Bottom cover (covers batteries) 0.012 lb
2 Detachable Head (bristles and plastic with metal spring) 0.012 lb
3 Body (plastic with metal shaft) 0.158 lb
4 Battery (powers brush) 0.054 lb
5 Plastic (covers brush head) 0.006 lb
Total Voltage of Battery 1 and 2: 3.07V (connected in series)Mean Current Under Load: 0.259APower (under load) = 3.0V x 0.295A = 0.855 watts
-# of hours available per singlebattery under load conditions: 6.78 hours-Estimated duration for each brushing: 1/30 hours-# of days before battery replacement: 203 days
4.4.2 Dissection
Bill Of Materials
Bill of Materials
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Par
t #
Part
Name
QT
Y
SOP
Effec
t
Function Mas
s (lb)
Materia
l
Manuf.
Process
Dimension
s
Cost Time to
complete
Part
Dissectio
n
1 Spring 1 Yes Suspend
s Motor
.001 Metal Spring
Mold
0.6cm by
0.5cm
$0.1
5
2 minutes
2 Motor 1 No Moves
Metal
Rod
.074 Metal Metal
Casting
Assembl
y
4.5cm by
1.6cm
$0.0
7
2 minutes
3 Metal
Clip
1 Yes Makes
clip
connect
to
bottom
.002 Metal Casting 4.1cm by
1.5cm
$0.0
5
2 minutes
4 Black
andRed
Wires
2 No Connects
batteriesto motor
.001 Copper
plastic
Wiring 6cm long $0.0
8
2 minutes
5 Rotato
r
1 No Connects
to
motor;
moves
back and
forth
.002 Metal Casting
Assembl
y
0.5 long $0.0
5
2 minutes
6 Power
Button
1 No Push and
makes
brushwork
.002 Plastic Injection
assembly
0.3 long $0.0
2
2 minutes
7 Plastic
Case
1 Yes Covers
motor
.018 Plastic Injection
Molding
2.5cm by
1.5cm
$0.0
4
3 minutes
8 Metal
Shaft
1 No Moves
brush
.010 Metal Casting 7.5cm $0.5
0
3 minutes
9 Brush 1 No Brushes
teeth
.002 Plastic Injection
Molding
0.9cm $0.4
0
0 minutes
10 Body 1 Yes Covers
motor
.044 Plastic Injection
Molding
14cm by
2.5cm
$0.3
0
1 minutes
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Component Subassembly Chart
Electric Toothbrush
Bottom BodyToothbrush Head
Brush Shaft HeadinternalsCasingBatteries
Motor MetalSh
aft
Rotator Base
Clip
Wires Spring Rod Cap
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Morphological Chart
Concept Generation Table
Power Source Brush Handle Switch Type Brush spin Other
1 AA Batteries Rubber One button Full Rotation Plays music
2 Rechargeable Rubber Slide Side to side Interchangeable head
3 AA Batteries Rubber Two buttons Up, down side
to side
Timer
4 Rechargeable Rubber One button Full Rotation Rechargeable Base
Power Source Brush
Handle
Switch Type Brushing
Direction
Other Functions
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Our new and improved design,
Our design is different from most because of its unique brush head. The brush head is not only
removable but the bristles themselves are unique. They are in a ring shape and they will rotate
360 degrees clockwise. The reason for them being in a ring shape is to make brushing around
the edges of your teeth easier and more effective.
The concept is powered by a rechargeable battery, which can be charged in an hour and will
work for half of the charging time or 30 minutes. This makes it easier to travel with your
toothbrush not worrying about bringing the charging station with you. We chose a rechargeable
battery because itseasy to use and doesnt take up as much space as batteries do in the
toothbrush. Batteries are hard to dispose of and not very good for the environment, which is
another reason why we chose rechargeable.
The toothbrush also has a very unique aspect to the grip and power module. The toothbrush will
start to work just by touching the grip. We decided that a push button can be difficult foryounger kids or older adults because sometimes they may be difficult to push. We eliminated
this by having the touch grip because all you have to do is hold onto the rubber comfortable grip
and the brush begins to rotate.
Review
There are many kinds of toothbrushes out there to choose from, including manual, battery-
powered, and rechargeable automated toothbrushes. Battery-powered toothbrushes are different
from electric toothbrushes, aside from being rechargeable. Battery-powered toothbrushes usuallyonly vibrate the bristles of the head to clean. Electric toothbrushes can oscillate, vibrate, or rotate
depending on which one you get. Although battery-powered toothbrushes are less expensive,
electric toothbrushes have to be replaced far less and you do not have to buy batteries for them.
Most battery- operated toothbrushes also dont give you the option to switch out heads. (1) Our
sample toothbrush was the Oral-B Advance Power 400TX. The actual retail price of our sample
toothbrush was $204.99. When looking through the website, we noticed that the rechargeable
toothbrushes were dramatically less expensive than the battery-powered toothbrushes. This
further encouraged us to design a more affordable rechargeable electric toothbrush. (2) We
researched the Colgate 360 Sonic toothbrush, which is automated. The average price of this
toothbrush is around $30. The toothbrush has a vibrating head and uses one AAA alkaline
battery and is not rechargeable and does not come with a warranty. The head cannot be replaced.
(3) The Oral-B Professional Care 1000 toothbrush is rechargeable and comes with a charging
stand. It has a two minute timer and pressure sensor to prevent gum damage, indicates when the
head needs to be changed, and has a two-year warranty. Its price is around $70. (4) The Sonic
Spinbrush (rechargeable) is a rechargeable toothbrush that features a two minute timer and
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