Before coming for the session, we carried out a brief literature search about this material as a group.
Short Notes on Corrugated Fibreboard
A corrugated cardboard is made by a corrugated material between two sheets of paper. There are usually 2 types of paper used, being kraft and test liners. Kraft is stronger and easier to print on, hence used as the outer layer, while test paper is cheaper, hence used as the inner liner. The cardboard can be made double lined by sticking another corrugated board and paper, increasing rigidity and strength. It is also important to consider the paper weight which is measure in grams per square meter. Common paperweights include 115/125 GSM, 140/150 GSM, 185/200 GSM and 300 GSM. The flute is the “corrugated” section between the two liners. The flute height can be changed to give the cardboard different physical characteristics. There are also different type of walls. A single wall consists of the flute(inner) and the liner(outer). A double wall means there is an additional flute and liner.
Firstly we were taught how to use different types of cardboard attachments and their functions. The cardboard attachments includes score, bent, gusset, tabs, slots and flange. We were than tasked to produce a visual board showing as many different ways to join cardboard together as possible. We also had to present to the class the most preferred joinery and the reasons.
After learning a few important types of cardboard attachments, we were given a task to construct a cardboard unicorn and document the building process. Here are our unicorns.
Nigel
The attachment mainly use to form the unicorn is the slot+tab.
By installing this crank at the unicorn back foot, by turning it, it will create some tension onto the rubber band and then loosening the rubber band. This will form a push and pull action onto the parts that are connected to the wings, hence making the wings flap.
Bjorn
By inserting a rubber band onto the inside end of the wings, we can make the unicorn wings continuously flap by pushing the insides on the wings with a finger. By pushing on the inside of the wing, the wing will expand, the rubber band will pull on the inside of the wing causing the wing to retract.
A crank with a piston can be added to push the inside of the wings. This would allow the unicorn wings to flap by turning the crank. By turning the crank, the piston will move and push onto the inside of the wing causing the wings to expand. The rubber band will pull the wings back to its initial position, retracting them. Continuously turning the crank will cause the wings to flap back and forth.
Roy
Dissembling the parts
Making the head and body
Step 1: make a horse without hair
Step 2: Put hair in but forgets tail
Step 3: Add a horn and a pair of wings from a griffin
And Tada
Unicorn
Alright for a more practical and "ready to make at everyone's house" concept, a rubber band would most likely do the job no problemo ( just like Bjorn's). So instead I would like to propose an idea instead that is more hands-on and might require more equipment and dedication to making, where I sketched it on paper and realized I can't draw wings.
The idea is that the rod that is connected to the tabs has to move in a reciprocating direction so that the wings will flap, just like how a lever arm moves on a pivot. So in order to make it move reciprocating, I figured a cam would be a good way to make it.
(Example of a cam I made :D)
As the cam moves it in a reciprocating manner, the rod pulls and pushes the tabs back and forth, hence flapping the wings. ヽ(・∀・)ﾉ
Vernon
Firstly I disassemble the parts.
I then made the head first as it was the most straight forward.
For the body I made it easier for me by bending the bents first.
just had to connect all together
Then I had to put all of my unicorn parts together
I used the rubber band method like Bjorn as it was more simplistic compared to Roy's
References
BirdBrain Technologies. (n.d.). Mechanisms: Cranks with Pistons. [online] Available at: https://www.birdbraintechnologies.com/hummingbirdduo/projects/mechanisms/mechanisms-cranks-with-pistons/ [Accessed 12 Jul. 2021].
GWP Group. (2018). Corrugated Board Grades Explained: Different Types of Cardboard | GWP Group. [online] Available at: https://www.gwp.co.uk/guides/corrugated-board-grades-explained/.
Hello peeps. This week we carried out an experiment we were assigned called the air-lift pump challenge. we were required to contract the set up with provided equipment. Here is our equipment and experimental setup Here are the results we obtained from the experiment Experiment 1 b = 10cm, Y=16.5cm a (cm) X (cm) Flowrate (ml/s) Average Flowrate (ml/s) Run 1 Run 2 Run 3 2 14.5 5.93 5.80 5.71 5.81 4 12.5 4.20 4.13 4.23 4.19 6 10.5 2.82 2.63 2.60 2.68 8 8.5 1.39 1.11 1.93 1.47 10 6.5 0.39 0.37 0.39 0.49 Experiment 2 a = 2cm, X=14.5 b (cm) Y (cm) Flowrate (ml/s) Average Flowrate (ml/s) Run 1 Run 2 Run 3 10* 16.5 5.93 5.80 5.71 5.81 12 14.5 2.89 3.78 3.20 3.29 14 12.5 1.35 1.35 1.20 1.3 16 10.5 0.19 0.19 0.18 0.19 18 8.5 0 0 0 0 20 6.5 0 0 0 0 we used an estimated flowrate of 0 as t water was barely being pumped out. it took too long to collect 100ml of water and it was not feasible for the experimenter to hold the tube for so long. 1. ...
Roy, Nigel ,Bjorn, Vernon Group 3 DCHE2A02 Topic: Material Selection for Inner Layer of Thermoflask For week 4, we went to revisit our last year module which was the materials for design and we were tasked to find the right material for the inner layer of a thermoflask. In materials for design, we needed to find the right requirements for the material and from there find different suitable materials. We then use the COWS matrix (Criteria, Options, Weightage and Score) to determine the best material. Here is our findings. Material Requirements In order for the liquid inside the thermoflask to remain hot/cold, the inner layer of the thermoflask must reduce the amount of heat transfer from the liquid to the surrounding. The inner layer thus should have a low thermal conductivity and a high melting point. Since the inner layer will be in contact with water, it must resist corrosion by any liquid put into it, water and acids from soda drinks. It will be used for drinking, so i...
Firstly, we went to buy drinks as we were feeling very thirsty and while drinking we were chatting about the stuff we did during the holidays. After finishing our drinks, we had to use the toilet. We also decided to prank Vernon by taking a wefie with him using the toilet. We were feeling stressed due to the long and hectic day and decided that we needed to distress by playing some mobile games together. We were feeling restless, so we decided to do some pushups together. Despite it being tiring, all of us had plenty of fun together. All in all, this was a fun bonding experience for our group and we felt that this opportunity allowed us to get to know one another better.
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