Ch3 Formulating a Design Problem Std

8/10/2019 Ch3 Formulating a Design Problem Std

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64

Engineering

Design

246

Brewing time

FIGURE

3.8 Customer satisfaction

versus brewing tim

FIGURE 3.9 Customer satisfaction

coffeemaker.

1.5

Maximum

pot

versus

maximum

p

135

Temperatu

FIGURE

3.10 Customer

satisfaction

versus

beverage b

heit)

for the example coffeemaker.

TABLE

3.7 Continued

Economic

r

Should

have

economic

life

of

moettran

5years

'

Should

not

require

costly

factory

servicing

Geometric

lirnitations

r

Height,

width,

and

depth

less

than 15

in. by

10

in. by 10

in.

r

Pot

must

contain a

minimum

of

48

oz

(eight

6-oz cups)

of brewed

beverage

.

Brew chamber should accommodate up to

4 cu.

in. of

coffee grounds

Maintenance,

repair,

retirement

r

The

coffeemaker

casing

should

be

easy

to

clean

r

No

repairs

should be

required

during

economic life

r

No

special

disposal

efforts should

be required

Reli

ability, robustness

r

No

failures

should

occur

during economic

life

r

Will accommodate

variations

in

water,

coffee

grounds,

supply

voltage

Safety

r

Will not

burn,

electrocute

or otherwise

endanger user

Pollution

r

Will not

create noise

>30

db

Ease

of use

,

Simple

to

fillwater,

add/remove

grounds

and

filter

paper

"

One

switch

to turn

onloff,

with indicator light

¡

Simpie to remove

basket and place

in

dishwasher

Human

factors

'

No

large forces

or

torques

required

to

operate

r

Pot handie

to fit 5-95th

percentiie females

and males

r

Srvitch

to

have

obvious

mode

of

operation

:

Removable

parts

should

be

graspabie and not

slippery

Appearance

I

Color

& shape

scheme

to

match

currellt

appliance

trends

r

Surface

finish

should

be

smooth

to faciiitate

cleaning

Company

Requirements

Markeling

'

Retail

price should

be

less

than

$30

Manufacturing

E

Production

run

quantity

is

estimated

at about

25.000

units

r

A

beta

prototype

should

be

ready

for

testing inT}months

r

Components

must be made

with injection-molding

processes at

current plant

Financial

r

Development

costs

should be

paid

back

in three vears

Other

I

Production

prototYpe must

be

Ul-approved

Appendices

r

Site

visit

data

r

SaleslMarketing

data

r

House of

Quality

o

*J

qr

a

5l

(n

a<

U

U)

+J

a

.*L

a

q



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Ch3 Formulating a Design Problem Std