Melting sprues?
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Thread: Melting sprues?

  1. #1

    Default Melting sprues?

    Hey everyone,

    A random question came across my mind. I am looking to make some moulds and casts of some stuff, and was wondering, seeing as how i have a crap load of sprues, if they could possibly be "melted" down for injection moudling?

    Thanks, Cheers.

    Gary.

  2. #2

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    Yes, I believe that wargames factory (?) run a programme that recycles them


    edit: yes they do ..."The old soilders recycling program", http://wargamesfactory.com/Recycle
    Last edited by Tercha; 12-17-2009 at 10:29 PM. Reason: added web address

  3. #3

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    I believe they can be melted down for reuse, I know GW used to run an inhouse policy for exactly that reason.

    Marc

  4. #4

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    Does anyone know how to melt them down?

    Apparently grinding them into pellets makes it easier, so that will be taken into consideration. but what about the actual melting process? i mean they have to be maluble enough to pour into a mould. then it can cool and harden.

    Cheers. thanks so far!

  5. #5

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    Chop them up finely, then sauté them in a light bed of oil, before adding the herbs...

    oh, O.k, wrong train of thought, but in an old pot with indirect heat would my guess,

    Marc

  6. #6

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    they will indeed need to be maliable however the liquid would be injected into the mould (injection moulding) at extreme pressure
    also the fumes given off are tres bad so i would advise "dont try this at home"

  7. #7

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    Most people that do moulds and castings at home aren't using injection, and the materials they work with are very different. Unless you're willing to invest in the equipment, learn how to do it, and find the materials, it probably isn't worth getting into (not to mention it's only advantageous when you are making large runs).

    I personally use Smooth-on for moulds and cast using resin (don't recall which, Hirst arts has a good comparison) and love it.

  8. #8

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    Wonder if you could make a press mold type thing? Sort of like how they stamp out metal objects from sheet and rod. It wouldn't be anything spectacular, but might be good for swords, knives, candle sticks, miniature sprues...
    "Reality, she's a mathematical bitch from hell.", MaxedOutMama
    Wanna be bored? Watch me twitter. --<>-- Still have neurons? Watch my YouTube channel on painting!
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  9. #9

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    you can't do injection molding at home.
    Unless of course you happen to have an injection molding machine laying around
    here's some light reading:

    http://en.wikipedia.org/wiki/Injection_molding
    My Gallery <IMG SRC=http://www.coolminiornot.com/rank.php?name=mickc22> Paragon Studios

  10. #10

  11. #11

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    Quote Originally Posted by Tercha View Post
    Too expensive! But here's a small 28 ton model on eBay: Engel 28 Ton Injection Molding Machine. And it's working, for only $3500. Just would need to make a road trip to Virginia. Easy for me, little harder for you I suppose.

    I hate it when the engineer in me starts to squirm. I'm pondering trying to see what it would take to make a desktop injection molding machine. Wouldn't be good for mass production, but might be fun for hobbyists. Anybody know what temperature green stuff melts at?
    "Reality, she's a mathematical bitch from hell.", MaxedOutMama
    Wanna be bored? Watch me twitter. --<>-- Still have neurons? Watch my YouTube channel on painting!
    Want to know when to fry your neurons? My painting twitter will announce the videos.
    To judge how far to follow my advice, consider this: ---<>--- Slappin' paint on minis since 2006

  12. #12

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    In addition to the machine itself, you're going to have to figure out how to make dies for your mould. I'm not even sure how one would make a die from aluminum or steel at home.

    And why would you limit yourself to green stuff? Green stuff is great for making models by hand, but probably doesn't have very ideal properties for injection moulding.

  13. #13

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    Quote Originally Posted by Benihana View Post
    In addition to the machine itself, you're going to have to figure out how to make dies for your mould. I'm not even sure how one would make a die from aluminum or steel at home.

    And why would you limit yourself to green stuff? Green stuff is great for making models by hand, but probably doesn't have very ideal properties for injection moulding.
    Ah, here's the thing. First thing that popped into my head was two metal plates that held a space for a green stuff mold. That way, you don't have the expense of making a metal mold each and every time. So, you'd use Plate A with a GS center to start, then add the object to mold along with some standard cylinders for flow channels and vents to locations preformed in the plate. Put more GS in Plate B, then screw the two together to make a nice tight mold. Let harden, disassemble, remove the flow tooling, and screw the two plates back together. Now you've got a mold that you could use.

    The whole idea falls apart if the melting temperature for GS is near or less than the plastic. But I guess it doesn't have to be GS. Just figured that was something familiar and easy. Now you've got me thinking what else might be good. Want it to be something relatively common, and safe (relatively) to use at home.

    I'm really thinking this through way too much. Tempted to look up some heater elements.
    "Reality, she's a mathematical bitch from hell.", MaxedOutMama
    Wanna be bored? Watch me twitter. --<>-- Still have neurons? Watch my YouTube channel on painting!
    Want to know when to fry your neurons? My painting twitter will announce the videos.
    To judge how far to follow my advice, consider this: ---<>--- Slappin' paint on minis since 2006

  14. #14

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    I don't see why you shouldn't be able to do small press molds with the softened plastic - both making the mold and copies. Experiment with temperatures release agents though. The softened plastic could be REAL sticky.

  15. #15

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    Quote Originally Posted by Shawn R. L. View Post
    I don't see why you shouldn't be able to do small press molds with the softened plastic - both making the mold and copies. Experiment with temperatures release agents though. The softened plastic could be REAL sticky.
    ..and really hot! if you've dripped melted plastic on your skin you'll know it feckin burns!!
    My Gallery <IMG SRC=http://www.coolminiornot.com/rank.php?name=mickc22> Paragon Studios

  16. #16

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    Metal would be so much easier
    http://www.princeaugust.ie/
    and stuff is cheap and available
    but that still leaves you with the sprues
    maybe get a few thousand and dump them on the floor of the Tate gallery and say it is your latest installation on "the end of plastic?"

  17. #17

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    Quote Originally Posted by Tercha View Post
    Metal would be so much easier
    http://www.princeaugust.ie/
    and stuff is cheap and available
    but that still leaves you with the sprues
    Easy? Easy?!

    http://www.girlgeniusonline.com/comic.php?date=20091019
    "Reality, she's a mathematical bitch from hell.", MaxedOutMama
    Wanna be bored? Watch me twitter. --<>-- Still have neurons? Watch my YouTube channel on painting!
    Want to know when to fry your neurons? My painting twitter will announce the videos.
    To judge how far to follow my advice, consider this: ---<>--- Slappin' paint on minis since 2006

  18. #18

    Default

    Quote Originally Posted by mickc22 View Post
    you can't do injection molding at home.
    Unless of course you happen to have an injection molding machine laying around
    here's some light reading:

    http://en.wikipedia.org/wiki/Injection_molding
    You know, I just read that article, and as I feared, the melting temp of green stuff (epoxy) appears to be below the sprues (polystyrene). So my little idea of using GS as a quick solution to the molding problem won't work.

    Oh well, gives me an engineering problem over the break I guess.
    "Reality, she's a mathematical bitch from hell.", MaxedOutMama
    Wanna be bored? Watch me twitter. --<>-- Still have neurons? Watch my YouTube channel on painting!
    Want to know when to fry your neurons? My painting twitter will announce the videos.
    To judge how far to follow my advice, consider this: ---<>--- Slappin' paint on minis since 2006

  19. #19

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    Please don't try this at home.

    Injection molding is usually done under pressures that would cause a green stuff "press mold" to quite literally explode. Not sure about you, but molten plastic spraying all over the place is not something my significant other would take kindly to.

    If you are serious, there are places online that can do contract CNC machining to make you a proper mold. The cost will likely run a couple thousand dollars but you could then cast for nearly forever as the molds are quite durable.

  20. #20

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    Quote Originally Posted by markstorch View Post
    Injection molding is usually done under pressures that would cause a green stuff "press mold" to quite literally explode. Not sure about you, but molten plastic spraying all over the place is not something my significant other would take kindly to.
    Just to clarify, it would have been GS sandwiched between and encased in some metal. The GS was just going to be in the pocket. Moot point because of the temps, but just wanted to note that.

    And you'd be surprised what my SO puts up with!
    "Reality, she's a mathematical bitch from hell.", MaxedOutMama
    Wanna be bored? Watch me twitter. --<>-- Still have neurons? Watch my YouTube channel on painting!
    Want to know when to fry your neurons? My painting twitter will announce the videos.
    To judge how far to follow my advice, consider this: ---<>--- Slappin' paint on minis since 2006

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