Product Specification
Background
A lot of time is wasted cutting grass in the campus. If it so happens that a number of areas are covered
by one person at the same time, money and time can be saved. Thus, our team would like to come up
with a grass cutter controlled by humans. This grass cutter can be controlled by humans to a certain
height and the grass cutter can manage by itself to a certain extent. If this happens, users can control
more than one grass cutter thus saving time.
Target Group
Questionaire
Summarized from 10 different customers
Question
Typical uses
Likes
Customer statement
-Cutter grass so fast
-full power with sample of uses
-less effort
-Low cost
-Easy to repair when needed
-Safe for human and pets
-Size
- Moderate
- same shape
-production
-intelligent
-Safe for environment
-high performance
-Temp.response rate high
Dislikes
-heavy
- Shouldn’t go out of the field
-temp. control
-noise
-capacity
damage
-contamination
-costly to repairs
- Slightly not too much
Suggestion
improvements
-expect your cutter to stop
working when it goes out of field
-I expect the machine to detect the
hard element like stone
Interpreted need
 Cutter should be able to
move fast
 Small input should be
given
 Parts should be
replaceable easily
 Be safe for people as well
as pets
Importance
Good
Good
Should
Good
 It is expected to be small
 Height of grass to be cutmoderate
 Grass to be cut should
follow the shape of
ground
 Expected to stop on its
own if there is any
blockade
 Not produce harmful
wastes (like burnt petrol)
Good
Must
 Weight is light
 Expected to stay on grass
all time
 Temperature remains cool
 Less noise
 Less damage expected
Nice
Should
 Cheap to repair
Should
 Stop working when no
grass
Should
 Stop when there is
blockade
Good
Must
Good
Should
Nice
Should
Should
Preparation for Product Design Specification
Need List
1
Small input should be given
2
Parts should be replaceable easily
3
Be safe for people as well as pets
4
Height of grass to be cut- moderate
5
Grass to be cut should follow the
6
shape of ground
7
Not produce harmful wastes (like burnt petrol)
8
Expected to stop on its own if there is any blockade
9
It is expected to be small
10 Cutter should be able to move fast
11
Weight is light
12
Expected to stay on grass all time
13
Temperature remains cool
14
Less noise
15
Less damage expected
16
Cheap to repair
Good
Should
Good
Must
Must
Must
Should
Good
Good
Good
Nice
Should
Nice
Should
Should
Should
From 1-4= 1 being least important and 4 being most important
Metric and Values
No Needs Metric
1
3 Height of Grass
2
Good sensors to prevent accidents
3
Strong Materials
4
Total Mass
5
5 Wheel sizes
Importance Units
Cm
Kg
list
6
10 Speed of Motor
m/s
7
5 Height of Body
cm
8
1 Time of Input given
s
9
15 Safety number of materials
10
3 Number of sensors detecting object in front
11
3 Sensitivity of sensors
12
13
14
15
Number of heat wafers (get rid of heat)
12 Accuracy of sensors to detect grass
list
list
list