Term 4, post 1

On today's lesson i started the box for my mechanical toy. Everyone else in the class has already started in on the last week of school in term 3, but because I wasn't there, I had to start yesterday. We were shown the plan for the box and then we had to draw 4 pieces on the timber, cut them out and sand them. This work had to be accurate because this was the base of the toy and everything had to be of the same size. So next lesson we have to glue 3 part together and leave 4th part as a top part. And I also have some more things to do next lesson, because I need to catch up. 

post 13

Evaluation of your design in terms of aesthetics, function, ergonomics and economics.

Aesthetics.

Well, my design looks alright. However, my first design was quite different but during the process, i realized that it wouldn't work and had to change it. The new design looks pretty good and modern, but when I was gluing the part together, the boxes moved and they are not perfect rectangles, but fortunately it cant we seen, if you don't know about it.

function 

My desk tidy is still i the workshop and haven't check it. But I recon its function is going to be good. As I'm going to give it to my mom and she has a lot of jewellery, my present will be really suitable. The desk tidy is green, which is her favourite colour, so it is another positive aspect of this project. It doesn't take much space which is good, because it has to contain a lot of things but occupy 

ergonomic 

My desk tidy is pretty ergonomic. The hand can fit in the space between top and bottom boxes easily. All the things that are in the bottom box can be taken out without much effort.  

economics

I don't know how much money would it cost to make the desk tidy, because the school provided all the materials and equipment.

Post 12, question 4

For the question number 4 we have to find the total surface area of the plastic that we need to make our exact desk tidy.  So I've decided that I'm going to find the surface area of each piece and then add all of them together.

1)because my top boxes are made of stripes and bottoms. So I have to find the surface area of a stripe and then the SA of the 'bottom parts' and add them together.

 top box on the left:

Length= 7.5+6.5+7.5+6.7

= 28.2 cm

SA= L * W

SA= 28.2 * 3.1

= 87.42 (square cm) 

2)Top box on the right:

Length= 10.5*2+6.5*2

=34 cm

SA= L*W

SA=34*3.1

=105.4 (square cm)

3)Left box on the bottom:

Length= 9.5+7+9.5+7

=33 cm

SA= L*W

SA=33*3.1

=102.3 (square cm)

4)Right box on the bottom:

Length=7.55+6.2+7.8+6.5

=28.05

SA= L*W

=28.05*3.1

=86.96 (square cm)

 

5)To find the SA of all the stripes, I have to add all the SA's together

SA of all the stripes= 87.42+105.4+102.3+86.96

=382.08

6)The SA of top 'floor'

15.4*6.4=98.56 (square cm)

7)The SA of a support thing that holds top boxes in a right place:

13*8=104 (square cm)

8)The SA of the back wall:

20.3*18=365.4 (square cm)

9)The SA of the base:

10.5*18=189 (square cm)

10)To find the total surface area (TSA), I have to add all the previous SA together.

TSA= 382.08+98.56+104+365.4+189

=1139.04 (square cm)

=0.113904 (square m)

Post 11. Desk tidy is completed and ready to be used! :)

On yesterday and today's lessons we were down in workshop. I was finishing my project. 

On yesterday's lesson I had to glue everything together. And I was done,when I finished it. However, when I did so, I realized that my top and bottom boxes weren't perfect rectangular shapes, but because I already glued everything together and I couldn't move them anywhere. So I had to leave them. When I glued all the parts and I actually got my final shape, everything was good for me, except for the boxes. But I can't do anything about it, so I'm still pretty happy with my desk tidy. 

It takes 6 hours to glue to actually get everything, so I lest it over night, because we have lesson the very next day.

And on today's lesson I checked my work, sanded some edges with sanding paper and I'm done. So I got my project and went upstairs to do my Blogg and the final question in theory part. We have to use Maths rules to find the total surface area of our desk tidy. So, that's what I'm going to do now. 

This my desk tidy, completed and ready to be used.

 

However, next time I will try to do better, because as we can see my desk tidy is far away from perfect. Next time, I will measure everything better and make sure all the points are at the same place, and everything is perfect.

I'm going to keep this desk tidy on my table till the end of the term and then I'm going to give it to my mom. 

Post 10

On today's lesson I started glueing. Now I have my boxes all glued and ready. A also glued a base to the two small boxes. I had couple of problems this lesson. One of them was using a glue. Because a person who used it before me, didn't close it properly so it stacked and didn't want to come out. But then Mr Andrews fixed it. Another problem occurred during the actual process of gluing things together. When I did so, I realized that some of my edges are not that straight and that affected on the shape of my boxes, as they are not perfect squares. But unfortunately I can't fix it any,ore. S I need to get over it and try harder and more accurately next time. However, I still looks alright, I might use sanding thing (the one when you use this long thing) at the end to fix the edges. A other thing that I thought went not the way I wanted it to, was that the angle of my banded part(the wall and the base) wasn't 90° exactly so the boxes, which walls are 90° wouldn't fit in, so I had to move both of them forward a bit. So I have a small gap there, but no one will be able to see it because of my top boxes.
When I' ll  finish all of the things that I want to and when I' ll fix all the problems that I have, my desk tidy will look good and will help me to organize things on my desk:)
That's what I have so far:

Post 9, research question n. 3

INJECTION MOLDING OF POLYMER 

Injection Molding is a process in which molten polymer is forced under high pressure into a mold cavity through an opening (sprue).

Polymer material in form of pellets is fed into an Injection Molding machine through a hopper. The material is then conveyed forward by a feeding screw and forced into a split mold, filling its cavity through a feeding system with sprue gate and runners.

Injection Molding machine is similar to Extruder. The main difference between the two machines is in screw operation. In extruder screw rotates continuously providing output of continuous long product (pipe, rod, sheet). Screw of injection molding machine is called reciprocating screw since it not only rotates but also moves forward and backward according to the steps of the molding cycle.

It acts as a ram in the filling step when the molten polymer is injected into the mold and then it retracts backward in the molding step.

Heating elements, placed over the barrel, soften and melt the polymer.

The mold is equipped with a cooling system providing controlled cooling and solidification of the material.

The polymer is held in the mold until solidification and then the mold opens and the part is removed from the mold by ejector pins.

Injection Molding is used mainly for Thermoplastics, but Elastomers and Thermosets are also may be extruded. In this case cross-linking occurs during heating and melting of the material in the heated barrel.

A principal scheme of an Injection Molding Machine is shown in the picture.

 

Injection Molding is highly productive method providing high accuracy and control of shape of the manufactured parts. The method is profitable in mass production of large number of identical parts.

Thermoplastics commonly used in Injection Molding are as follows:

• Polypropylene (PP)
• Polycarbonate (PC)
• Acrylonitrile-Butadiene-Styrene (ABS)
• Nylon 6 (N6)

Injection Molding is used for manufacturing DVDs, pipe fittings, battery casings, toothbrush bases, bottle lids, disposable razors, automobile bumpers and dash boards, power-tool housing, television cabinets, electrical switches, telephone handsets, automotive power brake, automotive fascias, transmission, and electrical parts, mirror housings, steam irons, washer pumps, spoilers, butter tubs, moisture vaporizers, yogurt containers, toilet seats, cell-phone housings, cradles or bases for personal digital assistants, case of a notebook-computer, computer mouse, electrical connector housings, lawn chairs, automotive ashtrays, and cookware appliance handles and knobs, aerosol caps, household items, bottle caps, toys. 

Post 8, research question 2

Question 2.

Industrial name        Common name                  Properties                                  Uses

1)PVC.                       Poly(vinyl chloride).        Strong rigid solid                  Pipes, siding, flooring

2)PVAc                   Poly(vinyl acetate)        Soft,sticky solid                          Latex paints, adhesives