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    (Original post by DKelly30)
    i got all my paper done. in the question it won't tel u exactly wat to design as in a pushchair or trolly. ive designed two pushachairs and one foldable trolly. got the whole thing done apart from the evaluation page. will do it tomorrow as i have a bit of time before our test. Our teachers have been great with this test. Bit ****e with the CAD/CAM test, probably why i did **** ut did anyone notice that the materials test, 3 questions were exact from the 2003 paper, im so lucky cos i knew that paper. anyways away to bed. good luck tomorrow everyone
    No I didn't, but luckily for me everything I revised the night before came up on the test and I knew most of it!
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    im gonna vcry my self to bed tonight?!
    i cant draw to save my life?!
    good luck guys
    and if 'whoo' in japan does this exam before us..
    please enlighten us
    bi bi
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    Good luck tomorrow everyone guys. Get some sleep if you can.
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    night night

    don't let the bed bugs BITE!
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    on the bearings side they probnly wanted to cover the eventualities because they are lumped to gether as one bullet point, so as long as you have a few good examples of the avalible bearings out there and the systems of wheels and fixing the wheels to things then you should be able to addapt these if you cant use bought in components like castor.
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    argh just tought about handles.
    wat would be best to use for pushchair handles?
    some form of injection moulded plastic? which plastic will be best?


    also what mateiral are you using from frame of pushchair? im going with aluminim tube.
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    I have uploaded my current digital folder of the data I have, I have not put up the sketches I have soz but 2 time consuming. anyways
    I have just stuck it on a host site I have not used befor but I have checked it and it all seems fine and dandy.
    Lnk to my files:

    http://www.filewire.com/download.php...c693f1897a4672

    hope it helps, you need winzip installed, comes standard with new pcs (win me or higher).

    Sleep well all good luck!

    T
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    Good luck guys! thanks to everyone for their help with things.. hope everythin goes well for u all! nite nite x
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    lol, i just woke up and its 10am in the morning!! my exam at 5pm in the afernoon hehehe ...anyway gl to everyone
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    hello. compleetly new here. was just doing some last minute research, found this. Very interesting stuff guys! Pretty useful. Lol, i personally am very screwed...i can't draw a darn trolley/buggy sort of thing to save my life. I'm in Hong Kong and my exam is at 4:15 and it finishes at 7:15 AHHHHH SO LATE. Madness. Anyways to all in the UK, good luck!
    Flores
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    hey people of japan
    wow they make you do your exam late, thats porbably because so we cant cheat by getting you to give us information :P.
    anwyas good luck
    bye
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    Good morning, Not long now, Good luck to all
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    (Original post by effloresce)
    hello. compleetly new here. was just doing some last minute research, found this.
    Theres just nothing like that last second panic is there?? Really gets the blood goin :P
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    Oh and u guys all seem to be focussing on aluminium tube! steel tube is just as effective - its stronger - therefore thinner cross sectional tubes can be used so the weight/strength is really quite close - plus its loads cheaper and can be MIG welded (again cheaper) plus its environmentally friendly (according to the book its the worlds most recycled material!) and can be easily bent into shape in mass (using hydraulic rams with oil in the tube to stop caving - again its in the book)

    Anyway if any of u are interested :- because its good trust me (and its what lots of already existing products use anyway) just dont forget it needs to be painted or epoxy powder coated (laminated in essence)

    Weight of Round Steel Tubing
    Outside Wall Weight
    Dia. Thickness per Foot (god bless Americans and there cute feet)
    1.25 .049 0.629
    1.25 .095 1.172
    1.25 .120 1.448
    1.5 .049 0.759
    1.5 .065 0.996
    1.5 .083 1.256
    1.5 .095 1.426
    1.5 .120 1.769
    1.75 .049 0.890
    1.75 .065 1.170
    1.75 .083 1.478
    1.75 .095 1.679
    1.75 .120 2.089
    2.0 .049 1.021
    2.0 .065 1.343
    2.0 .083 1.699
    2.0 .095 1.933
    2.0 .120 2.409
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    (Original post by hwoo)
    lol, i just woke up and its 10am in the morning!! my exam at 5pm in the afernoon hehehe ...anyway gl to everyone
    that means your exam is in about 2 hours time.... 11am uk time, so u will be finished by 2pm uk time?
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    ok so for prduct manufacture, you have to have 5 proccesses:

    T.i.g./m.i.g welding
    Hydraulic Ram metal bending
    Injection moulding
    Rivetting
    Galvanising?
    Painting?

    Also, you need 5 Quality checks and 5 assembly jobs.... any suggestions?
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    Heres a brief run down of the markscheme

    Part A)

    6 sensible and justified points
    • Suitable materials
    • Sizes with reference to child/adult antho data
    • Evidence of research
    Spider diagrams need to go two levels!!!

    Headings:
    Purpose/Function
    • Clearly define the problem in 2 points
    • Easy to operate/move/store etc

    Environmental issues
    • Used recycled materials:
    o steel is worlds most recycled material
    o aluminium easy to recycle as well
    • Life cycle analysis – what happens to the product at the end of its life?

    Quality
    • Well made and finished
    • Quality checks during manufacture
    • TQM for consumer confidence

    User and target market
    • Parents aged between 20-30
    • With children between 0-5

    Legal requirements
    • ISO 9000 is the quality control during manufacturing
    • BS 7409 Safety requirements for wheeled child conveyances
    • BS 1615 Anodic oxidation coatings on aluminium
    • BS 2569 Sprayed metal coatings - Protection of iron and steel by aluminium and zinc against atmospheric corrosion
    • BS 970 - Specification for wrought steels

    Materials
    • Must be lightweight
    • Frame:
    Aluminium tube – TIG welded, anodised with colour, bent around jig (pressurised water inside to stop tube collapsing)
    Steel tube - Normal welding, cheaper than aluminium, stiff resists torsion
    • Seat:
    Nylon fabric hammock between bars
    LD/HD Polyethylene base with cushions

    Part B)
    Generating ideas

    • 3 ideas
    • 2 materials
    • 2 production methods:
    injection moulding seat
    steel tube rolled from sheet and ERW (electrical resistance welded)
    Steel tube filled with oil (to stop caving), placed on jig and bent with hydraulic rams
    • 5 sensible evaluation & justification points

    Part C)

    • Evidence of development from previous design (2marks)
    • Does it work (2 marks)
    • Suitable materials (2 marks)
    • Suitable method of production (2 marks)
    Pipe bending - Welding

    Describe and justify the solution in terms of function, appearance, performance, materials, components, systems, processes and technological features.

    7 points made with JUSTIFICATION

    Part D)

    Final solution
    • 4 pieces of evidence of suitable manufacturing processes
    • 4 notes on suitable assembly
    • 8 dimensions suitable proportioned (refer to anthropometrics)
    • Mention orderable parts – buying in items.
    • Cutting list – suitability of materials

    Part E)

    • 5 points about:
    Industrial processes
    Jigs and techniques
    • 5 points of assembly in correct order
    • 5 sound quality checks
    How controlled and maintained

    Part F)
    • 5 marks for ways in which the item could be tested
    • 5 marks for ways in which the final design could be improved
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    Thanks for the mark scheme Foagal

    Just can't get 5 point for:
    • 5 points of assembly in correct order
    • 5 sound quality checks
    How controlled and maintained
    and • 5 marks for ways in which the item could be tested
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    http://www.plasticwheels.com/technical.htm

    http://www.ee.washington.edu/consele...ufact/95x2.htm
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    good luck to any1 whos exam is today, mines at 1:45pm
 
 
 
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