casting an aluminium slingshot out of aluminium foil!

Discussion in 'Show off your homemades!' started by The Art Of Weapons, Feb 13, 2013.

  1. <div>hi there!<br>in this video I will be showing you how I made my first aluminium slingshot.<br><embed pluginspage="http://www.macromedia.com/go/getflashplayer" src="http://www.youtube.com/v/SlKV_ALrcnQ" width="425" height="350" type="application/x-shockwave-flash" wmode="transparent" quality="high" scale="exactfit"></embed><br>I hope that you enjoy it!<br>also please check out my youtube channel for more!<br><a href="http://www.youtube.com/user/theartofweapons/videos?view=0" class="postlink" target="_blank" rel="nofollow">http://www.youtube.com/user/theartofweapons/videos?view=0</a>
    </div><div class="clear"></div><div class="signature_div">
    <br>I love making slingshots and slingshot crossbows<br>check out my youtube channel <a href="https://www.youtube.com/user/theartofweapons/featured" class="postlink" target="_blank" rel="nofollow">here</a> for more!<br><img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7">
    </div>
     
  2. The dry form .... or oil-bonded sand ...<br><a href="http://www.ebay.de/itm/2-kg-Formsand-Olformsand-superfein-Zinn-Blei-Profiqualitat-1-99-Kg-/200875447198?pt=Figuren&hash=item2ec51c139e" target="_blank" rel="nofollow">http://www.ebay.de/itm/2-kg-Formsand-Olformsand-superfein-Zinn-Blei-Profiqualitat-1-99-Kg-/200875447198?pt=Figuren&hash=item2ec51c139e</a><br><br>Better with a good charcoal fire, and in a hole in the earth, grill is the danger of melting through, the use of air (hair dryer) or gas! <br><a href="http://www.youtube.com/watch?v=aZcrP8gonAY" target="_blank" rel="nofollow">http://www.youtube.com/watch?v=aZcrP8gonAY</a><br>-<br>Long tongs - Water Pump Pliers<br>-<br>Question: How many films do you hate needed?<br><br>Thank Googel translator....
     

  3. Lars

    Lars The Evil Genious

    2,028
    2
    38
    <div>nice</div><div class="clear"></div><div class="signature_div">
    <br>hmm nice slingshot!<br>maybe needs some sanding and oiling <img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7"><br><a href="http://www.youtube.com/user/selfmademilitary" class="postlink" target="_blank" rel="nofollow">my Channel . . . . . Selfmademilitary</a><br><a href="http://slingshotforum.forumieren.com/" class="postlink" target="_blank" rel="nofollow">My Forum</a>
    </div>
     
  4. tokSick

    tokSick Senior Member

    3,951
    1
    0
    So finally, you did it and it works. The slingshot seems to perform very well, nice job!
     
  5. LW

    LW New Member

    642
    1
    0
    My greatest respect for all the work that you have invested in this project. And based on the work,<br>I can see that your craftsmanship is very good. Even my respect, because I believe that you are still younger, and I think it's great that young people like you, have the desire to deal with such Projects.<br><br>I think it´s very nice to see that the ss is not cut out from a piece of Aluminium, ist a casted Model, and that is fine!!!<br><br>Nevertheless, what you're doing is very very dangerous. You do not have the clay mold previously heated, (and by the way, it is impossible this way) and yourself have seen that there have been many small explosions in the hot aluminum. Most of the energy (heat) was derived down in the pot in your experiment. If you would make the clay<br>form thicker and more stable, will accumulate the heat and the aluminum will explode upwards. Then will help no goggles or leather gloves. If a glowing piece of aluminum falls into your jacket or sweater, it will burn right down to your socks, which will be unimaginable pain, with scars that will be seen all your life.<br>Melting of aluminum, in the iron processing, is one of the most difficult and dangerous things you can do. (with the resources and tools, available to you)<br>The first experiment is gone good (lucky you) I would ask you not to make a further experiment, because I would find it a great pity to lose a young talent like you, by an unnecessary accident.<br><br><br><br>I do not want to improve you, or criticize,<br>it's just well-intentioned advice.<br><br><br>Regards
     
  6. slingpit

    slingpit Slingshot addicted

    1,606
    1
    0
    Cool.<br>How long did it take to get enough liquid alu for casting?
     
  7. <div>Thanks for all of the nice comments!<br>also LW I understand your concern and next time (if i can be bothered) I will cut it out of a sheet of aluminium of use a proper sand cast <br>thanks.</div><div class="clear"></div><div class="signature_div">
    <br>I love making slingshots and slingshot crossbows<br>check out my youtube channel <a href="https://www.youtube.com/user/theartofweapons/featured" class="postlink" target="_blank" rel="nofollow">here</a> for more!<br><img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7">
    </div>
     
  8. stej

    stej New Member

    333
    0
    0
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>LW wrote:</b></span></td></tr>
    <tr><td class="quote">My greatest respect for all the work that you have invested in this project. <br><br>..<br>Most of the energy (heat) was derived down in the pot in your experiment. If you would make the clay<br>form thicker and more stable, will accumulate the heat and the aluminum will explode upwards. <br>..<br><br>Regards</td></tr>
    </table>
    <span class="postbody"><br><br>LW, thanks for you insight. <br><br>What I don't understand are the thoughts about explosions. If the form was thicker (that means more mass), than it will accumulate the heat and the heat would be distributed much more in the clay so in fact it would be colder than with thin form. I can't find any relation between the heat, form and the explosions. Could you explain that?</span>
     
  9. Fryskehoun

    Fryskehoun New Member

    93
    0
    0
    Very nice yob, I bow my head to you. Realy a great yob.
     
  10. <div>
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>stej wrote:</b></span></td></tr>
    <tr><td class="quote">
    <br>LW, thanks for you insight. <br><br>What I don't understand are the thoughts about explosions. If the form was thicker (that means more mass), than it will accumulate the heat and the heat would be distributed much more in the clay so in fact it would be colder than with thin form. I can't find any relation between the heat, form and the explosions. Could you explain that?</td></tr>
    </table>
    <span class="postbody"><br><br>I think that he means that if there was more clay underneath then there might be a larger explosion from underneath the molten aluminium causing some to fly out but the explosions were so small that you could barely hear them, it was just the slay cracking not a large explosion so LW I think that you should not worry and also next time I will use a different mould so everything is good!</span>
    </div><div class="clear"></div><div class="signature_div">
    <br>I love making slingshots and slingshot crossbows<br>check out my youtube channel <a href="https://www.youtube.com/user/theartofweapons/featured" class="postlink" target="_blank" rel="nofollow">here</a> for more!<br><img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7">
    </div>
     
  11. LW

    LW New Member

    642
    1
    0
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>stej wrote:</b></span></td></tr>
    <tr><td class="quote">
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>LW wrote:</b></span></td></tr>
    <tr><td class="quote">My greatest respect for all the work that you have invested in this project. <br><br>..<br>Most of the energy (heat) was derived down in the pot in your experiment. If you would make the clay<br>form thicker and more stable, will accumulate the heat and the aluminum will explode upwards. <br>..<br><br>Regards</td></tr>
    </table>
    <span class="postbody"><br><br>LW, thanks for you insight. <br><br>What I don't understand are the thoughts about explosions. If the form was thicker (that means more mass), than it will accumulate the heat and the heat would be distributed much more in the clay so in fact it would be colder than with thin form. I can't find any relation between the heat, form and the explosions. Could you explain that?</span>
    </td></tr>
    </table>
    <span class="postbody"><br><br><br><br><br>Ok I can try to explain. I hope you understand it, because of my bad English. <br><br><br>As you have seen in the video, the clay mold was not very thick, about 2 - 3 cm material.<br>This form was in a pot of sand. With this combination, the energy (heat) can<br>be direkted quite good down to the sand, since the clay was thin and<br>sand takes very well the energy (heat). If you make the clay<br>form now much thicker, it has the same effect as a cold casting mold. When it is<br>not heated before casting, the huge different temperatures between the cold casting mold and the liquid aluminum created<br>huge tensions, since the aluminum start to harden very quick at the contact points. This tension or blocked energy can make the material jump in an explosion.<br>This also dependent on the amount of the filled liquid aluminum. How you could see in the movie, it was no problem to fill the liquid aluminum in a small cake pan.<br>The energy was not so much, it was very quickly taken by the cake pan and drained. If he had now filled the cake pan much higher, it would probably come to an explosion.<br>Only a professional can assess, in what quantity in any form jumps (if not heated) or the material explodes. It was pure luck that there has been no disaster.<br>A heated mold, gives the aluminum a lot more time to cool down, it caused less tension<br>in the material. You give the liquid aluminum the time that its atomic structure assigns again. Exactly the opposite happens in the hardening of steel. But this effect is exactly wanted.<br>The best casting mold for aluminum to try at home would be a heated special harden sand mold.<br><br><br>But I would not recommend this.<br><br><br><br>I hope I have made myself a little clearer?</span>
     
  12. Bert the Welder

    Bert the Welder New Member

    2,201
    0
    0
    First off let me say I'm shocked that you are so young! At least I'm assuming that based on yer voice. Having said that, and in addition to my advise on the other alum. casting post, I'm very impressed. You are very articulate and have obviously done some home work. Bravo! I'd be interested in knowing how many feet/meters of alum. foil it took to get the amount needed? I think the SS looks great all things considered. Has a nice ancient artifact look to it. I'm glad nothing harmful happened whilst pouring. I clenched when you put the full can down to switch to pliers and it started to tip. <br>Note: The white liner in the can; might want to avoid cans like that. I know the latest kerfuffle over BPH's being in the liner material is the latest rage. I don't know much about BPH's or what fumes they produce when heated/burned, but best to be safe. Try and use something like the tongs you used to initially used to pull the can out of the fire to pour with. Switching tools adds an unnecessary step that can invite an accident. Plus they'd keep yer hands out of harms way, as well as avoid the awkward wrist twist you had to do because of the inline grip with the pliers. For shaping alum., course abrasive at slow speeds is what you need. Dremel tool would work as they hae some carbide bits that would work a treat. Hand files, even course rasp's would be a good choice. Any sort of grinding stone is just going to clog. Your belt sander would work with a course (20-40 grit) belt and slower speed. I use an air die grinder. <br>Cool SS though. If I was closer to you, I'd offer some time at my shop. You could probably fab a two part steel mould to cast into. Kinda like a cookie cutter with a base. <br>Glad to see it worked and, again, you're a well spoken young man. Past on a "nice job" to yer parents!<br>And just to put a brain bomb in your head, if you cut your next one out of alum. plate, look up "engine turning" on the web. Something else you would probably have fun with and a challenge to do correctly. <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2">
     
  13. onnod

    onnod Im from Holland, isnt that weird?

    6,001
    18
    38
  14. FIAAO

    FIAAO Failureisalwaysanoption

    3,648
    19
    38
    I agree, nice work!
     
  15. <div>I think that it took about 20m of the aluminium foil!<br>also thanks for your tips I will use them for next time</div><div class="clear"></div><div class="signature_div">
    <br>I love making slingshots and slingshot crossbows<br>check out my youtube channel <a href="https://www.youtube.com/user/theartofweapons/featured" class="postlink" target="_blank" rel="nofollow">here</a> for more!<br><img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7">
    </div>
     
  16. <div>
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>slingpit wrote:</b></span></td></tr>
    <tr><td class="quote">Cool.<br>How long did it take to get enough liquid alu for casting?</td></tr>
    </table>
    <span class="postbody"><br>It took about 5 mins for the first aluminium to melt once the fire was at its hottest, once the first bit has melted the rest melts almost instantly.</span>
    </div><div class="clear"></div><div class="signature_div">
    <br>I love making slingshots and slingshot crossbows<br>check out my youtube channel <a href="https://www.youtube.com/user/theartofweapons/featured" class="postlink" target="_blank" rel="nofollow">here</a> for more!<br><img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7">
    </div>
     
  17. Bert the Welder

    Bert the Welder New Member

    2,201
    0
    0
    Dunno where you live, but you could look around for fabrication shops that use alum. and ask for scraps. Boat builders, awning makers, custom welding shops etc. might just be happy to give a young guy a hand and be interested in what you are doing. Bring a sample to show them. I found that when I tell people I'm making a sculpture, they get interested and want to help. If they help on a regular basis, I bring them some beer once in a while to thank them. If I've learned anything in life that's most useful, it's build relationships. It pays huge in the long run. <br>That and don't eat the yellow snow...........
     
  18. tokSick

    tokSick Senior Member

    3,951
    1
    0
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>Bert the Welder wrote:</b></span></td></tr>
    <tr><td class="quote">don't eat the yellow snow...........</td></tr>
    </table>
    <span class="postbody"><br><img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7"><img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7"><img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7"><img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7"> ROFL <img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7"><img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7"><img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7"><img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7"><br>I didn' t get it at first <img src="http://illiweb.com/fa/i/smiles/icon_redface.gif" alt="Embarassed" longdesc="10"></span>