Amost Invisible slingshot

Discussion in 'Show off your homemades!' started by Kyl, Oct 4, 2011.

  1. Kyl

    Kyl New Member

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    After carving the plastic Corian, I wanted to try making a clear, glass like, slingshot from a piece of 3/4" bullet-proof polycarbonate sheet. I have used this stuff to replace broken or "at risk" windows, but I have never tried to carve it. I didn't know it I would be able to bring it back to optical clarity. <br><br><br><br><img src="http://img683.imageshack.us/img683/4135/polycarbonateslingshot1.jpg" border="0" alt=""><br><br>What do you think. Is it for real or photo shopped? Here are some progressive photos.<br><br>Here is the cut out blank. I had to use a coarse jig saw blade to keep the poly from melting from the heat of friction.<br><img src="http://img36.imageshack.us/img36/3971/polycarbonateslingshot2.jpg" border="0" alt=""><br><br>here is roughed out with rasps and files<br><br><img src="http://img841.imageshack.us/img841/8717/polycarbonateslingshot3.jpg" border="0" alt=""><br><br>Sanded to 500 grit. <br><img src="http://img51.imageshack.us/img51/6590/polycarbonateslingshot4.jpg" border="0" alt=""><br><br>This material shows you every tiny flaw in the finish. When I thought I <br>was done with one grit, I would wash it and carry it out into the sun <br>light and every imperfection would shine out like a sparkling facet. <br><br>Sanded to 1000 grit.<br><img src="http://img199.imageshack.us/img199/3562/polycarbonateslingshot5.jpg" border="0" alt=""><br><br>Polished with Meguiar's plastic polish for clear auto head lights.<br><img src="http://img710.imageshack.us/img710/6305/polycarbonateslingshot6.jpg" border="0" alt=""><br><br>Unfortunately polycarbonate is not as scratch resistant as acrylic or Perspex, so I am a little hesitant to shoot it. Ha! No fork hits please.
     

  2. JoergS

    JoergS Administrator

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    Really cool slingshot... and great polishing job.
     
  3. R3dsnail

    R3dsnail New Member

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    great work there do like it when it at that froseted stage
     
  4. RobertP

    RobertP New Member

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    Wow that is a sexy slingshot, if it turns up missing dont bother looking in canton lol.
     
  5. BavarianBarbarian

    BavarianBarbarian New Member

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    That's amazing! The shape and surface look so perfect that one could think it was injection molded. I really appreciate your craftsmanship.<br><br>Maybe you could increase the scratch resistance with some sort of coating. Clear two-component paint might be harder than the polycarbonate.
     
  6. 3bears

    3bears New Member

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    cracking job Kyl! how does it shoot being able to see through the forks? <img src="http://illiweb.com/fa/i/smiles/icon_biggrin.png" alt="Very Happy" longdesc="1">
     
  7. Antraxx

    Antraxx #7

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    really nice job. (reminds me of a glass dildo tho <img src="http://illiweb.com/fa/i/smiles/icon_redface.gif" alt="Embarassed" longdesc="10"> )<br><br>slowing the jigsaw down a LOT makes cutting that material kind of easy. no real need for coarse blades then.
     
  8. dayhiker

    dayhiker New Member

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    That looks like it was a lot of work. But it was certainly worth it -- beautiful piece!
     
  9. Oldschool

    Oldschool New Member

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    Wow! This material is awesome! I guess it can take plenty of fork hits. Have you tested the strength for fork hits and heavy bands? How much per sheet?
     
  10. petersonOD

    petersonOD New Member

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    Haha this is sweet! I like your slingshots man! You should definitely make more of these.
     
  11. Bill Hays

    Bill Hays New Member

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    I really like them out of polycarbonate... but don't go and test it out to much, the ricochets can really sting!
     
  12. Kyl

    Kyl New Member

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    Thanks guys, I appreciate the response. I'm still a bit apprehensive about banding it up. I've only recently returned to the slingshot fold, maybe 3 weeks ago. I've been practicing up and am starting to feel a little more confident in my shooting technique but I would hate to smash the cool finish on this beaut. I will probably just wait a few more weeks. There are hard-coat finishes out there, Like on eye glasses, but they have crazy chemical names? Audio CDs are polycarbonate with a hard coat. If you have ever tried to break one of these in half then you know how tough his stuff is. I have fired a number different bullets at a piece of the very sheet this frame was cut from. bullets fired from a .22LR, .38 Special, 9mm Para, .40 S&W, .45 auto and shot gun blasts up to 00 buck were all trapped in the sheet. Bullets fired from a .357 Mag, .44 Mag, .30-30 Win, .223 Rem, .243 Win and .270 Win all cruised right on though. In Joerg's Video where he bounces the steel ball off of the Motorcycle helmet visor and breaks his window, That's polycarbonate. Sorry Joerg. When I saw how close you were to your house, I could smell trouble. I hope your wife could laugh with you.
     
  13. 3bears

    3bears New Member

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    if you're looking for a name, it has to be something like 'the ghost slingshot' lol it's totally different and the frame looks like a cracker to shoot!
     
  14. Kyl

    Kyl New Member

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    I was thinking I'd call it "Das Schleuder Geist."
     
  15. JoergS

    JoergS Administrator

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    That would be "Der Schleudergeist" (Geist = Ghost is male). <br><br>My wife isn't of the bitching type (thankfully), plus we sold the house with the hole in the window anyway.
     
  16. Cuthbert Allgood

    Cuthbert Allgood New Member

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    that is so nice. I gotta get my hands on some of that stuff.. i worked on opaque white HDPE and it is alright... i have some 1/8 inch of this stuff that i found in clear and blue .. just a couple square feet of it. Might be cool for handles. but this whole frame is spectacular.
     
  17. Kyl

    Kyl New Member

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    Thanks Joerg, My German is nonexistent. I might know 20 words. Congratulations on selling your house.<br>Der Schleudergeist it is.<br><br>Hey bj000, what if you glued/laminated the clear and blue together to make it thick enough. Maybe even put something in the middle of the plastic like a thin board of wood or maybe a page from a comic book?<br><br>All the pieces of polycarbonate that I have gotten were from the metal scrap yard (recyclers). most industrial plants that have steam or high pressure hydraulics will have many safety shields made from this stuff. They have to replace it every so many years and so the scrap yard will sometimes have some.
     
  18. Cuthbert Allgood

    Cuthbert Allgood New Member

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    wow, that is a killer idea. what kind of glue should i use??
     
  19. porcelanowy

    porcelanowy New Member

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    Yellow <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"><br>Well I sit behind my desk with mouth opened <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"> Kyl if you don&rsquo;t mind the first photo will<br>land on my desktop <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"> Satinfinish after the 1000grit sand paper looks good, but<br>after polishing&hellip; the fork became a showpiece <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"><br>I have made a knifehandle with a thin plexi in the middle just for the look (sorry, can&rsquo;t<br>post links yet). Now I think I will look<br>after a sheath of this stuff <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"><br><br>Cheers<br>Rafal