DM2317 | Design for Manufacture n

8/14/2019 DM2317 | Design for Manufacture n

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DM2317 | Design for Ma ufacture

MTOMYS

EGPROD

SUCT A

EALYSI

BYMARI

CS REP

R. SIQUEIR071954

ERT OF

__


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DM2317 | Design for Manufacture 2

Mario R. Siqueira (0719547)THIS IS A HEADING

TABLE OF CONTENTS

Introduction 3

Market analysis 4

Market and statistics 4

Child priorities 4

Parent priorities 4

The Megasketcher Classique 5

SWOT 5

Materials analysis 6

Manufacturing analysis 6

Assembly analysis 7

Product comparison 7

References 9

Bibliography 9


3/9

DM2317 |

INTR

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sketchers

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4/9


5/9

DM2317 |

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Figure 8 sprue marks


for its usage stylus, stamps and eraser reducing the

probability of lost parts.

Although its overall size can be considered slightly too

large for certain infants from the age group to carry it

nevertheless becomes very appropriate to be use without a

table, directly on the childs lap. (Figure 3)

MATERIALS ANALYSIS

The disassembly of Megasketcher revealed several

different coloured plastic and some metal parts. Different plastic

colours were sampled and tested following the provided

protocol. Due to ambiguity of the flame and smell test results it

can only be narrowed down to whether different samples are

thermoplastics or thermoset plastics. The Blue, green, orange

black and yellow samples displayed thermoplastic behaviour

(ie. melted) under 260 degrees Celsius or direct flame and

stretched during bending. The white samples (one for the stylus

holder and another for the eraser structure plastic displayed

termoset characteristics such as being very brittle and

disintegrating under direct flame. The choice for a stronger and

more flexible (though more brittle) plastic for both the stylus

holder and the moving eraser reflects the fact that these partssuffer more strain from use than the rest of the body (under

normal conditions). Additionally to the plastic parts that are also

metallic screws, a small gear shaft, the motor spring, two small

springs in each side of the stylus and the magnets themselves.

The nature of the magnotophorectic screen is still largely

unknown although the analysis revealed that it is composed of a

gluey foam, less than 1mm thick, sandwiched between two

paper thin sheets of plastic: one transparent and one opaque.

Theres no apparent reason for not having two transparent

sheets. The gluey foam seems to act as a sponge which has

embedded in its matrix, the magnetized liquid. The removal of

both plastic sheets did not disrupt the magnetic capabilities.

MANUFACTURING ANALYSIS

The disassembly of this product revealed several

identifiable marks of injection moulding such as moulding

Mario R. Siqueira (0719547)


7/9

Figure 9 snap fits


seams, sprue marks (Figure 8), split lines, snap-fits (Figure 11)

and intricate features. The shape and overall assembly of this

product indicates that human intervention in the assembly. This

is a typical product of mass production, a strategy to reduce the

end price and the costs of manufacturing.

The manufacturing process can probably be improved

with simplification of the parts and by automatization.

ASSEMBLY ANALYSIS

The assembly of this product starts with the placement of

the magnetophoretic screen in the blue container. The screen

has several holes around its edge which can be aligned and

placed onto the plastic tips in the blue container. Just below the

screen theres a space where the eraser slides. After locating

the screen and the eraser mechanical parts, the orange face

plate can then be snapped to the top of the blue container, thus

sealing the screen between those 2 main parts of this product.

Before snapping of the orange part the stylus holder need to

need screwed to the orange part.

At this point the product needs to be flip to its back to

assemble the 2 blue back plates. One of these plates differs

from the other by having a dented groove along which the

eraser engine slides. This is one of the main improvements from

Magna Doodle.

PRODUCT COMPARISON

Comparing the styles evolution between the Pilot Pens

Magna Doodle and Tomys Megasketcher one can verify the

addition of more complex curves to the plastic casing in the

modern toy. These rounder edges not only provide a safer form

to the toy it also confer a more appealing form to the child. The

magnetophoretic screen is also improved. Instead of evenly

distributed units of hexagons filled with magnetic particles this

new screen seems to be made of a fine foam mesh where the

magnetic particles are embedded. This mesh has random size

bubbles but all much smaller than the standard Magna

Doodle hexagon unit, thus allowing a finer stroke with the

correspondingly finer stylus. The added spring powered motor



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Figure 10 snap-fits (both pictures)

Figure 11 Signs of Injection moulding such assprue marks


eraser improved on the two swipes to erase requirement of

the Magna Doodle (only one swipe is necessary as the eraser

will return to the initial position automatically) but it increased

the noise cause by the movement of the gears and spring.

Megasketcher competes in the market with other drawing

toys such as the Tomys Lumisketcher, Etch-a-sketch and

Tomys Aquadraw. Compared to lumisketcher, even tough

megasketcher does not support colouring it does not spend any

ink. Aquadraw, like megasketcher, do not use any ink but does

use water. It is the humidification of the fabric that reveals the

drawing lines. So, as soon as the fabric dries the doodle is

gone. Also, it is not possible to have a fine line with Aquadraw.



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Figure 12 Magna Doole Honeycomb screen,from howstuffworks.com



REFERENCES

1. Pilot Man-Nen Hitsu Kabushiki Kaisha. Displayingmagnetic panel and its display device. Google Patents. [Online]

United States Patent and Trademark Office, 13 March 1979.

[Cited: 22 October 2008.]

http://www.google.com/patents?id=d9UzAAAAEBAJ.

2. Pilot Pen Corporation of America. Pilot Pen Wins MagnaDoodle(R) Trademark Lawsuit. PRNewswire. [Online] 21

November 2006. [Cited: 24 October 2008.]

http://www.prnewswire.co.uk/cgi/news/release?id=184900.

3. NPD Group. UK toy industry worth 2.2 billion afterstrong performance in 2006. British Toy & Hobby Association.

[Online] 24 january 2007. [Cited: 1 November 2008.]

http://www.btha.co.uk/press/industry_worth.php.

BIBLIOGRAPHY

British Toys & Hobby Association website(www.btha.co.uk, 01/11/08)

Making It: Manufacturing Techniques for Product Design

by Lefteri, C. 2007 Lauren King Publishing

HowStuffWorks: How Magna Doodle works?

(www.howstuffworks.com/magna-doodle.htm, 01/11/08)

Wikipedia: Toy; Toy Safety; Tomy, Plastics, and related

(www.wikipedia.org, 25/10/08 06/11/08)

Materials, Engineering, Science, Process and Design

by Ashby, M; Shercliff, H; Cebon, D 2007 Butterworth-Heinemann
http://www.btha.co.uk/http://www.btha.co.uk/http://www.howstuffworks.com/magna-doodle.htmhttp://www.howstuffworks.com/magna-doodle.htmhttp://www.wikipedia.org/http://www.wikipedia.org/http://www.wikipedia.org/http://www.howstuffworks.com/magna-doodle.htmhttp://www.btha.co.uk/

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