January 12, 2011

Materials and Manufacturing Processes

The following post is a result of querry by bipinzblog
This is answer to Q.9 of CEED 2009. It is related to my previous post  "Quick tips for last minute preparation of CEED"

 Material : Glass
Manufacturing process : Press moulding

Material : Polyethylene
Manufacturing process:  Injection moulding

Material :Porcelain / China Clay
Manufacturing process:  Throwing on a potters wheel, making the handle by hand, allowing to dry in sun followed by glazing then baking in a kiln

 Material : Polycarbonate (assuming it to be a plastic jar)
Manufacturing process:  Centrifugal moulding

Material : Polyvinyl Chloride (PVC)
Manufacturing process:  Injection moulding / Die moulding

Material : Polyethylene terephthalate / Polyethylene
Manufacturing process:  Die casting / Blow moulding / Press moulding

Further information about plastics and their processes can be obtained at this link.


Anonymous said...

Thanks a lot Prasanna Gadkari...You have done a gr8 help to me....I'm about to appear for CEED...thank u...

Anupama said...

Hi Prasanna, realy helpful blog. That jug is of polyethylene or steel, am confused.N if its of steel..wot process is used in making steel utensils.One more que, can we use instruments like rulers in questions other than the one of free hand composition drawing.Thanks,reply wil help.Luck is needed..lol

Prasanna Gadkari (M.Des in Product Design from I.I.Sc. ) said...

Dear Bipin,
Best of luck for the preparations :)

Prasanna Gadkari (M.Des in Product Design from I.I.Sc. ) said...

Dear Anupama,

Thanks for appreciation.

You know, even i was thinking the same thing, whether the jug is made of PE or steel. Maybe they should improve printing of these papers. What really matters here is your knowledge of materials and manufacturing processes. So, even if u make a valid assumption, that's alright.

Generally a process called 'drawing' and 'spinning' is used in making metal vessels. A very nice overview can be found here

About instruments; its no where said that instruments are not allowed, so you can use them. Still from the personal experience i would recommend doing without it. Its much faster and intuitive to finish a free hand sketch anytime.

Feel free to ask, if u want to know anything else

Best of luck :)

Anupama said...

hi Prasanna, thanks for the reply.Am planning to attend PD que.Have a few queries-Is 'form' of a product part of ergonomics?
And i mess up while i draw the construction details like parts assembly,various joints,and how to play with the form like making the products foldable or sliding parts into one another etc.from where can i get those details (drawings).Thankyou

Prasanna Gadkari (M.Des in Product Design from I.I.Sc. ) said...

Dear Anupama,

As the saying goes, 'form follows function' therefore, the form of a product is very closely related to ergonomics. Just think, why your pencil is only so much thick, and so much long?

The second question you asked is kind of tricky. U can study a few products lying around you. Also, perhaps a quick round of 'attribute method' should help you :) Take an example of types of cell phones: they are sliders, rotating ones, flip-opens, etc. can you take inspiration from these??

Left you thinking ...

Best of luck :)

shabarish. said...

Hi, prasanna ,ur blog s very helpful to me..can u pls help me out this que...There is a metal pillar with 100 screws holding it at the bottom, One of the screws always get's broken due to some reasons. How do you solve this issue.

Prasanna Gadkari (M.Des in Product Design from I.I.Sc. ) said...

Dear shabarish,

Though i wont ask you where you got this question from, i'd need some more information about the problem. Namely, the diameter of the pillar, the configuration of the screws, the load faced by the pillar and the material of the screws. Given this information, it does not take a product designer to solve it. hee hee

This brings my sweet memories of Force Motors back to me.

Thanks for the intriguing question :)

shabarish. said...

hi prasanna...n tat que din mentiontioned anythin..

Anonymous said...

Dear Prasanna,
Thanks a lot for the help...I wanna ask u some doubts like...There was a question in CEED 2011 Question 6 Animation Design: What does alternate sketches mean? Is it the same character in different poses?

Question 1.3: Below is an image of a triangle with some pattern on it. This triangle is mirrored four times as shown below. Draw the correct position of the pattern on the last triangle.
Could you please tell me what is its answer? My guess is that we obtain the same pattern as the first one...

Prasanna Gadkari (M.Des in Product Design from I.I.Sc. ) said...

Dear Bipin,

The 'alternate sketches' refer to different representative images you can use of farmer, politician and God respectively. There is also space provided labeled 'Character 1.Farmer' Now just choose one good sketch out of the 3 and make a strip.

About the triangle problem: instead of telling you the answer, i'll tell you the approach. Just label the triangle in clockwise direction. Say, ABC. Then the mirror edge is always side AB. even label the mirroed triangle as ABC in same pattern. What do you get?

Best of luck :)

saravanan said...

Dear Prasanna,

Hi i am having doubt in the plastic jar moulding , it can be made by blow moulding ? if so can u plz explain the difference between the blow an centrifugal moulding .

Prasanna Gadkari (M.Des in Product Design from I.I.Sc. ) said...

Dear saravanan,

You are correct. The plastic jar can be made by blow moulding too. In blow moulding an inert gas is blown into the a drop of plastic so that it is inflated into the shape of the mould. But this process does often gives a thick base but thin body. Thats why it is common in moulding disposable water bottles that are crushed after use. Whereas, the jar needs consistent properties along its body. Thats why the mould is rotated along with the molten plastic drop till it spreads on the sides of mould very uniformly.

priya said...

Hi Prasanna,I've completed my enginering in Computer Science. Im desperate to join IISC for M.Des. I have started praciticing sketches. Ur blog is so very useful for me

Prasanna Gadkari (M.Des in Product Design from I.I.Sc. ) said...

Hi Priya,
I am so happy that you found the blog useful. Hope you reach IISc PD. feel free to post any questions you have. Best of luck.

Abhrodeep Mukherjee said...

dear prasanna . me an final yr engg stud wid a passion of arts .. hav a strong hold at sktching ... as i hv been doing it since past 3 yrs and i hav diploma in fyn arts also ... wat now i wud hav to strengthen to crack dat and ceed .. how wil i develop my creativity more .. as i drw mostly human figures .

Prasanna Gadkari (M.Des in Product Design from I.I.Sc. ) said...

Hi Abhrodeep,
I feel that the question about developing creativity is a very general question. I have listed a few tips on cracking CEED and DAT, which should guide you. If you have any specific question feel free to ask.
Best of luck.

chetanyadav said...

Hello sir
In 2007, Q4 asks to show the details with the help of sectional view /exploded diagrams, it also asks to mention the materials recommended for each component. So, if I just mention materials as plastic, steel rubber etc, would that be fine or I need to mention what kind of plastic or rubber it is?
There was similar ques in 2008, it read "we'll be judged on the understanding of the materials." What does this mean?
Thank you

Prasanna Gadkari (M.Des in Product Design from I.I.Sc. ) said...

Hello Chetan,
For materials question it is not sufficient just to tell what material you can use, because each material has some properties that need to be named. For example, you make blades of steel, because it can take and retain very sharp edge for a long time. Suppose you have drawn an exploded view of a sharpener, you should name the blade like “material : stainless steel, sharpened and polished” And this is the understanding of the material, that will be judged.
I hope this is what you wanted to know
Take care

chetanyadav said...

Hello sir
yes, this is all i wanted to know, I have got the exact idea to answer such ques
thank you

Prasanna Gadkari (M.Des in Product Design from I.I.Sc. ) said...

Hello chetan,
Thats nice to hear!
if u feel i missed out anything, i can include it in the blog

chetanyadav said...

No sir, you are not missing on anything. Thanks for asking, your responses on the blog have been spontaneous.

Gautham said...

hi prasanna! your blog's amazing and really informative, thanks a lot for making it :)
i've got a que, i'm a 3rd year mech engineering student bt i'm more interested in getting into animation thru CEED. Will my college gpa influence my selection into an animation course at IDC? i've got it around 7.0 and i've got a history of backlogs :(.
(the blog post on building a portfolio for animation was awesome btw !)

Prasanna Gadkari (M.Des in Product Design from I.I.Sc. ) said...

Hello Gautham,
Thanks for all the nice words. On IDC selection criteria, it is nowhere mentioned that your GPA or backlogs are considered. Yet some institutes consider the GPA in case there is a tie between two equally deserving candiadates, though I do not know if IDC does this or not!
Anyway u must try ur best!!
Best of luck :)

Gautham said...
This comment has been removed by the author.
rudnerhopes said...

prasanna can u recommend me any books for CEED 2012?????

Prasanna Gadkari (M.Des in Product Design from I.I.Sc. ) said...

Hello rudnerhopes,
As far as i know, there are no books written specifically for CEED, plz let me know if you come across any. I am also looking
Besides that, there are a few general books on sketching, design process and idea generation, you can have a look at them in "resources" section of this blog

Anonymous said...

hello sir,i need ceed solved papers plz mail me .my id:janu.rathore8@gmail.com
plzzzz sir.......

Anonymous said...

please sir m waiting for ur mail sir plzzzz........

Prasanna Gadkari (M.Des in Product Design from I.I.Sc. ) said...

Hello rathod,
Sorry to disappoint u buddy, but i simply dont have any solve papers with me. All material i have is posted on this blog.
If you have any specific doubts plz feel free to ask

Neha Thakur said...

Hey prasanna, Loved your blog.
I m giving Ceed 2013 on 25 nov 2012.So I have been practicing sketching and looking at comic strips and racking my brains at all those design problems.
well, I m curious on what basis will the comic strips will be judged? also..Q6 of 2008 paper of story telling..do we have to use the images as it is or their positions can be changed..(only scaling,simplifing,repeating is mentioned)
PLz help..

Prasanna Gadkari (M.Des in Product Design from I.I.Sc. ) said...

Hi NEha,
The comic strip might be judged on basis of:
1. clarity with which you present the idea
2. How well can the reader understand the story
3. Use of visual symbols, like, showing dashed lines to show a running man
4. Minimum use of text

I feel, in that story telling question of crow and sheep, it is given that you should only do the operations mentioned, otherwise you might lose marks :(

Best of luck

Shwetank Pandey said...

HI sir I have doubt over material of that chair .. is that really PVC only? i looked at chair in my house. it is made from poly propylene

Prasanna Gadkari (M.Des in Product Design from I.I.Sc. ) said...

Hi Shwetank,
You are right. There are multiple solutions to this problem. For example, you can make a bottle of glass, poly ethylene or polypropylene, same applies to chair too! I appreciate that you took efforts to see manufacturing marks on the chair in your house :)

dathasai said...

Hi Sir, Your blog is really informative.please give answer to this question.What is the material used in manufacturing of plastic buckets?

Prasanna Gadkari (M.Des in Product Design from I.I.Sc. ) said...

Thank you :)
Generally, the high quality buckets, which are often food grade, are made with Polypropylene while the low quality ones are made with poly-ethylene. For the purpose of CEED, i believe both answers would be acceptable

munna yamuna said...

Thank u sir, Pet bottles are best made using ________________ process ? This question is asked in 2014 ceed paper.

Prasanna Gadkari (M.Des in Product Design from I.I.Sc. ) said...

Hello Munna,
PET bottles are made by blow mounlding
You can see the details of the process in this video

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Prime the unit before fitting it and check all components before replacing them - if they're old and worn, they too should be replaced. Don't grip the piston rod with pliers or place the unit itself in a vise, you'll damage it.
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