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  • Posted by Chris b 1 year ago. There are 14 posts. The latest reply is from Chris b.

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  1. User has not uploaded an avatar

    hi all...

    I've got an idea which will benefit us all,

    I want to get a small group of people together in Sydney (and later expand into other areas), who are willing to instead of putting their plastic bottles in the recycling bin , put them in a seperate bin where once a month they can be brought to a single place,

    from there they could be ground up or shredded washed separated and via injection moulding and extrusion be made into other more usefull items, e.g. pipe, sheet, seedling trays, various plastic parts, or simply stored for future use

    the same general idea could be done with steel and aluminium,

    I personally have and cnc milling machine and a lathe (plus a soon to be power hacksaw) and can pretty much make just about anything and i'm willing to do so

    my current to do list is

    1,serial port based CD changer (for David.Z so CDs/DVDs can be burnt quicker and easier and in a more automated fashion
    2,plastic shredder/grinder for turning plastic bottles... etc into flakes,
    3.vibration separator to separate flakes/parts of various density
    4,washer/separator - self explanatory
    5,melter/granulation machine
    6,injection moulding machine
    7,vacume table
    8,plastic extrusion machine

    the purposes behind the idea is to get some kind of a manufacturing base for the movment where if any member wants anything extruded moulded or machined, it can be done provided they are contributing to the cache of raw materials which otherwise would have gone into the council bins,

    ideally down the track if it turns out somewhat successful i'll look at a setup for melbourne and brisbane

    before anyone asks the inevitable question regarding cost, when i look at the cost of aluminium and steel ,i'm quite willing to put in the money and build the machinery , once its built we've got it forever, the question i have is how many people would be interested in participating,

  2. Change.Of.Heart

    That's really cool ! definatly something to raise at local chapter meetup and the people that participate don't have to be exclusivly zeitgeist followers either

  3. User has not uploaded an avatar

    Sounds good to me, give me something to do besides go to a club on the weekends.

    Are there other ways of collecting plastic and aluminum in large quantities ?

    I ask, cause i would like to speed this project along.

  4. dowell

    You could make some wheelie bins, and ask people to put plastic bottles in them and provide a bin and pick up service. Try pubs and clubs, cinema, etc, then provide a service for free, when they get in the habit and see the value in having the removal automated, you can ask for a service fee. You could expand and collect glass, food scraps for compost, and many more raw materials.

    When more corporations see the value in waste you will have trouble sourcing material so get in on the ground floor. You will need the space to sort and process.

    Small business grants can be on the offer for ideas for eco friendly business's, check with the Australia Council, they have bookets on all sorts of gov grants available.

    earth care, people care and fair share.
  5. User has not uploaded an avatar

    I was looking at wheelie bins 140litre is around $70 to $90, i was looking at a different angle with that too

    why not.....
    1,fit out a trailer with a "bin emtpying" attachment
    2,choose a series of suburbs which gives you a bin night 5 days a week
    3,harvest some random bins in each area until trailer is full
    4,process raw material into a useable form (plastic flakes)(glass powder)(pulp)(metals which if sorted can goto a scrappie)

    question , would that be classified as theft?... not sure it would

    on a side note ,i was in Cowra for the last week, and i got talking to a contractor out there who deals with waste and rubbish handling, when you break down household waste into categories,

    metallics - polymers - ceramic - biological

    and this is after potting your bottle and paper/cardboard in the bins provided,

    up to 10% of all household waste is actually organic and even then, theoretically if you had the means to separate it you would have near zero landfill and you could potentially harvest a large amount of raw materials,

    - could be a potential source of raw materials in the future,.

  6. User has not uploaded an avatar

    [+] Embed the video | Video DownloadGet the Video Plugin

    lol - just found this, it uses from what i can tell is a long drill bit in reverse for a screw, very nice

    i might do somthing similar instead of trying to use a hydraulic jack

  7. wildwabbit

    Clever little machine, I love it when I see lego incorporated into things, handy stuff. The drill bit is an wood auger bit, they vary in price depending on the size at around $80-$100 each, but I'm certain you could get one very cheap if you searched the second hand markets. I can sometimes aquire them from work, 20mm X 400mm is normally what we use, I'll mail one down if you don't have much success at the markets.

    Is is much harder to extrude tube, like you want to do? The straight plastic stips looks very simple, but I can't see a lot of practical use for it?

  8. User has not uploaded an avatar

    the actual bit itself,i think i've seen them at the local markets by the box load, I'll pay a visit next Sunday and let you know,

    when extruding plastic like that , he was probably putting a fair bit of pressure on the bit for such a small cross section, generally the greater the cross section the less pressure is required, unless the temperatures are too cool, also his "die" looked a little crude so it probably doesn't have any "leadin" for the plastic to follow to the hole, which would had added to the pressure dramatically

    I was looking at a hydraulic jack which would have done it 20 ton (a little overkill) but it's got the fatal downside where reloading would have been difficult if not impossible and limits the length of extrusion by how much will fit in the hole,

    extruding tube might be interesting because of the die needed but it shouldn't be a problem to produce one

  9. wildwabbit

    OK, I see what you mean, continuous feed is more desirable. If you still wanted to go with the hydraulic jack system, you could use two? One feeding while the other retracts, and a line feed switch mechanism so your not just pumping from one ram to the other. This is basically how a concrete pump works and achieves continous flow via hydaulic rams, simple but clever.

  10. User has not uploaded an avatar

    true i think the problem with the jack is that retracting might end up being the problem, and the molten plastic might not be willing to "let it go" , i've had that problem with a few of the compression injection mould i've done some have taken quite a considerable force to separate, infact i've damaged one trying to separate two halves,... all part of the learning experience

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