Materials and Structures.
1 Materials and Structures.
Assignment 2: Rotation Moulded Street Furniture for a festival Application.
The brief for this project is to create a
Traipsing around the streets of edinburgh
piece of street furniture for a Festival of my
going for show to show seeing many weird
choice, immediately I thought to design my
and wonderful acts can get tiring so I have
piece of furniture for the Edinburgh Fringe
opted to design a cluster of tables that can
Festival. As a regular visitor and enthusiast
be put together in any given destination in
of the Fringe I seen this as a prime opportu-
order to let the people of the Fringe take a
nity to design something beautiful for the
second out to enjoy a spot of food or
Festival enjoyed my thousands of people
maybe even a beer if the occasion calls for
I looked into a few different potential loca-
Other potential locations for the table could
tions for where to put my outdoor bar
stand/ table and decided that outside the Edinburgh Art Gallery overlooking Princes street gardens would be an ideal location. With a nice view and with it being a open area it means that people will not be cramped into a small area. As well as this there are often street performers in this area so people can enjoy the surroundings at the same time.
Near Bristo square another spacious but active area during the fringe. With the Udderbelly close it makes for a prime location. 3
When looking into existing designs of outdoor bar style tables I came across a few designs with a similar concept to mines. Although most of these structures are wooden rather than plastic they hold similar attributes. Most outdoor food and drinks areaâ€™s provide seats as well as the table for users but my design will not include seats and will allow for users to rest against the table or stand and enjoy their food or drink or to enjoy a conversation. 4
Although outdoor bars and places to eat are already openly available through out the Fringe festival there is not a communal area to rest where there is no pressure to buy a drink or something to eat. With my outdoor table design it allows people of any age to come along and enjoy their own food or drinks whilst enjoying all the festival has to offer.
In order to make the tables fit in with the surrounding things associated with the Fringe Iâ€™ve decided to base the colours around the 2013 Fringe colour scheme for their brochures, leaflets and posters. With the bold bright colours it will attract more attention with users and will entice to check out the tables.
3 Design Development
The design will be rotational moulded; this
The advantages of using rotational mould-
is the process of heating up the plastic be-
ing are that it allows to make larger com-
ing used to a high temperature and having
plex products fairly easily with a consistent
the mould rotate in order to produce a hol-
finish and wall thickness through out the
By using rotational moulding as the produc-
Within the rotational mould I am going to
tion process it allows for the product to be
use High Density polyethylene due to the
weighed down using water or sand when it
fact that it is a hard wearing plastic with
gets to its destination. This means that
good rigidity and resistance to outdoor
transport of the product is easier and more
conditions as well as general wear and
lightweight than usual products.
The table is a temporary piece of street furniture during the Fringe festival which runs for 4 weeks so it is ideal that its rotational moulded so it can be delivered and uplifted with ease with out any risk of it being stolen whilst the festival is running due to the fact that the material inside it can be dumped out easily before transport.
Combination of materials.
For the main rotational moulded section of
The second material that I have used within
my design I have opted to use Hight Den-
my design is stainless steel for the ashtray
sity polyethylene due to the fact that it is
part in the middle of the table.
impact resistant and tough so it will be less likely to give in due to heavy weight or
The main advantages of using stainless steel
Due to the weather during the Fringe festi-
- It is corrosion resistant so its not going to
val being so unpredictable HDPE is also an ideal material due to its thermal resistance; it can withstand warping, cracking or melting from -40ยบC to 100ยบC. Since the Festival is only on for 4 weeks during the month of August the tables can be recycled at the end since HDPE is widely recyclable. Another benefit of using HDPE is the fact that when it is rotational moulded it is light in weight meaning that transportation costs will be significantly less than for other products.
rust or corrode from weather conditions. - Ease of fabrication; stainless steel can be cut, welded, formed, machined and fabricated relatively easily. - It is available in many surface finishes. It is easily and simply maintained resulting in a high quality, pleasing appearance. - The cold work hardening properties of many stainless steels can be used in design to reduce material thicknesses and reduce weight and costs. Other stainless steels may be heat treated to make very high strength components
4 Structural analysis
Forces. Compression force from the load of food or drink on the table as well as the weight of users leaning on it
Force of the load on top of the table is spread out evenly. Sheer force from the wind load as well as people standing and leaning against the table.
The maximum weight that the table
The most problematic point of force
should have to deal with would be
upon the table would be the twist in
the weight of 6 people potentially
the middle of the body due to the
standing on the table:
odd shape and bend in the material.
Average person x 6: 960Kg.
Due to the temporary use of the table /bar stand there should be no problems with over use or wear and tear.
Looking into ergonomic dimensions of the table
From looking through a few different sources the standard height for a bar is around 1110mm and I have made my table height around the same height (1099mm). Average UK male height (16+): 1752mm Average UK male height (16-24): 1771mm Average UK male height (25-34): 1779mm
The size of each side of the hexagon is
The average space you should allow a per-
616mm allowing each user enough per-
son sitting at a dining table is around
sonal space when standing at the table, it
allows for them to comfortably stand around the table without feeling cramped and gives enough space to allow for them to rest their drink or food on the table and enjoy it comfortably without bumping the person next to them.
24. Upper limb length
The average length of a fully stretched out arm for a man is 790mm and the ashtray in the centre of the table is 555mm away from the edge of the table allowing for the user to comfortably use the ashtray and reach anything they have on the table that is in front of the ash tray.
6 Design Review
On a whole I would say that my design of a table/bar stand is successful, I have carefully considered different features of the table to allow for it to be comfortable for up to 6 users per table. Weaknesses of the design are that although the design is completely suited to most sizes of people not a lot of consideration has been put into suitability for disabled users or children although they can
The strengths of the tables are that they
still enjoy it comfortably.
can be put into different arrangements eas-
A change that could be made to the design to guarantee for them to make full use
ily to keep it interesting in different locations.
of the table would be to have a few differ-
The colour scheme of the tables have also
ent tables of a lower height. For wheelchair
been carefully considered to be recog-
users an ideal height for another table
nised clearly as a part of Edinburgh Fringe
would be 700mm.
7 Company Policy
The sustainable factors of the design are
For the stainless steel ashtray part of the
that due to the fact that it is formed from
design in its use or in its production proc-
plastic materials it can be sourced and pro-
ess, respects the human being, especially
duced locally. As well as this once the de-
in terms of health and safety.
sign is obsolete the plastic material can be widely recycled.
A sustainable material does not harm the people working to produce it, or the peo-
Plastics have a very good environmental
ple who handle it during its use, recycling
profile.Â Only 4% of the world's oil produc-
and ultimate disposal.
tion is used for plastics and much less energy is used to produce it compared to
Stainless steel is not harmful to people dur-
ing either its production or use. A protec-
The design also reduces use of fuel and
steels due to it including chromium.
larger vehicles for transport due to its light
tive layer forms naturally on all stainless
weight after production.
The passive layer protects the steel from
Since the plastic used to produce the table
the correct grade of stainless is selected
is already coloured it eliminates the need
for an application, the steel remains inert
to paint or maintain.
and harmless to the people who handle it
Another sustainable factor of the plastic
corrosion - ensuring a long life. As long as
and the environment.
used to create the design is that there is
These characteristics have made stainless
no other additional finishing needed once
steel the primary material in medical, food
the production process is finished; sand-
processing, household and catering appli-
ing, welding etc.
In terms of ethics, as a company we will
We will try and be as charitable as we can
consciously work towards creating good
with our design work making sure we can
design for our clients at a reasonable
donate what ever we can and help the
price. We will make sure any clients we are
best we can with design work for charita-
working with are also trying hard to be eco
ble organisations or any good causes in
friendly and sustainable with any works
need of help.
they are doing as well as following suit and maintaining these same ethics ourselves.
8 Final Design.
The final design of a Bar/table for use during the Fringe Festival 2013.