Practical 3

 JOINERY ✂

Our group was tasked with a practical to construct structures on a cardboard showpiece using joinery. Cardboard is an inexpensive material that is used in mostly packaging, and we did a small literature review on cardboard before proceeding with the practical.

Our literature review:

Corrugated Fireboard is used to make different types of paper that we nowadays see in the market. These papers range in strength as well as flexibility due to the number of walls and fluting the paper has. The flute will usually be manufactured from fully recycled material, while the surface would either be an aesthetic finish or a surface that is easy to print on. Different flute weight types serve as paper for different purposes, with E fluting being the best to use for printing, while C fluting being the best to use in weight distribution for better stacking strength. Different flutes can also be utilised with each other to give a wider range of strengths for the board. One example would be EB fluting, where very fine fluting and large fluting is combined together to give a balance between strength, protection and print finish. 

Some of the tools given to us were:

Penknives

Cardboard (obviously)
Hot glue

Thumbtacks

Tape
Metal rulers

INDIVIDUAL:

Cyane:

Part1:

Assembling my unicorn 🦄:

Using the given cardboard, I took out the parts, watched the video of assembling, I attempted it myself!! 

I was having troubles at first as the cardboard was bending to sides where I did not want it to, so i took my time and slowly folded the sides. 

THIS WAS MY END PRODUCT!!! THE CUTE LITTLE UNICORN!

Part2: 

Making the wings move:

After awhile of thinking, I decided to use rubber band to help make the wings move! Lets see how I did it.

Firstly, I tied the 2 inner wings together and pull it to hook at the tail of the unicorn. 

And another rubber band connected to the same place as the first rubber band used, and connect it to the front of the unicorn like the picture inserted below:

Trying out my mechanism:

By pulling the front rubber band, it helps pull the inner part and thus flapping the wings on the unicorn.

Automate the wing flapping:

Using a hook and a cardboard wheel, here is the automated system I have came up with.

The hook will be connecting the cardboard strap and the rubber band.

Thus, as the wheel turns, the cardboard strap will move downwards and hook will also pull the rubber band downwards allow the wings to flap.

Pi Ti: 

Part 1:

Folding the given cardboard pieces into the unicorn pegasus was relatively easy and fast as all the bends are marked. In terms of joinery, building up the unicorn pegasus consists mainly of slots and tabs.

Finished Product:

Part 2:

Next, to make wings move, I joined the two tabs of the wings in the body to a paper clip. Therefore, just by pressing on the paperclip, I am able to make the wings move simultaneously.

Andrew:

Part 1: Pegasus Assembling

I have used the Pegasus cardboard parts given to us and assembled the Pegasus. 

Time-Lapse for Pegasus Assembling

Parts of the Pegasus

Materials used: 2 wings, 1 body, 1 head, 1 tail, 1 horn, 1 mane

Initially, I was confused as to which way the Tabs are top be folded. However, I figured out which way it is supposed to folded. I also folded a crease that was not supposed to be folded which as on the wing. Luckily, I did not fold it too much such that the crease it too obvious. Generally, there weren't any obstacles when I was assembling the Pegasus. Upon assembling the Pegasus, I ahve notice a few of the joineries presented in practical 3 are used. E.g. Tabs, Slots and Tabs + Slots.

Connecting the wings to the body:

Connecting the tail to the body:

Connecting the mane and horn to the head:

!FINAL PRODUCT!

👀PRESENTING MY VERY OWN PEGASUS👀

Part 2: Automated Wing Movement

For this part of the practical, I have observed at how the wings should be moving. 

I have also looked at my teammates' mechanisms for the automated wing movement.

After giving some thought for the design of the automation and also observed how the wings are moved with my fingers, I have decided to mimic the hand movement and use it for my design.

Movement of the wings

Observe closely how I have used my hand to move the wings.

Design of the Mechanism

Location of where the Mechanism would be installed

The mechanism will be a to-and-fro working principle.

The mechanism used will require a force to be applied onto the tabs of the wings. The distance between the two movable stopper can be adjusted based on the rigidity of the tabs. I have designed it such that there is an allowance for the tabs to move in case the tabs are rigid. If the tabs are rigid, it may damage the mechanism or the tabs itself. Taking that into account, I have designed the such that the distance can be adjusted. 

When one spring is compressed the spring springs back to its original position, which causes the other spring to compress. This would be a repetitive motion. 

Junheng:

I noticed that the main joinery used when assembling the unicorn are: Slots, Tabs, Slots + Tabs and Skewers

During the assembling of the body, I started off removing the piece from the board before I started bending the individual faces off the creases while following the video. I made sure not to cause any unnecessary crease to prevent ruining the surface of the faces. Placing all the tabs into the slots, the finished body was ready for the head to be mounted on. I moved on to the head to proceed with the assembling process.

Same with the body, I made sure that I did not ruin the surface of the cardboard face by carefully folding against the creases provided to shape the head. I noticed that there was a hole at the top of the headpiece to skewer the horn in. 

After finishing up the headpiece, I mounted the head onto the body with the tabs provide on the top of the body. I proceeded to insert the wings as well.

My finished product then looked like this:

In order to allow the wings to return to its original position, I attached a rubber band from the two wings to the back of the unicorn, near the tail. The wings return back to its original position when I pull the wings forward as the rubber band is stretched and returns to its original position.

I would attach a wheel with a handle coming from the end of the unicorn. The rotating wheel would be able to push the wings back and forth as the wheel that is attached to the end of the unicorn is slanting at an angle.