My Bullpup Sling-X-bow

Discussion in 'Show off your homemades!' started by CaptainBacon, Feb 12, 2012.

  1. CaptainBacon

    CaptainBacon Knowledgeable Man

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    This is my third sling-x-bow to date. I wanted to try my hand at welding some parts for it from mild steel to allow for a more compact design. <br><br>After screwing up the steel sliding fork (d'oh!), I replaced it with a more bulky, plywood one. So in actuality, I only have a metal triggering system, instead of a fully slimmed down build. <br><br><a href="http://www.servimg.com/image_preview.php?i=14&u=17228318" class="postlink" target="_blank" rel="nofollow"><img src="http://i42.servimg.com/u/f42/17/22/83/18/imag0622.jpg" border="0" alt=""></a><br><br>Overall, it's just under 33" (About 83cm). The stock is laminated plywood With a slot routed for the triggering piece to slide freely. The circular cutouts are for weight reduction and they make it look much better. All parts have a flat black enamel coat, aside from the wear plate, which is clear coated. <br><br><a href="http://www.servimg.com/image_preview.php?i=15&u=17228318" class="postlink" target="_blank" rel="nofollow"><img src="http://i42.servimg.com/u/f42/17/22/83/18/imag0623.jpg" border="0" alt=""></a><br><br>The locking mechanism is welded steel that bolts into threaded inserts epoxied into the stock. The bars are set into the side wall and a sheet steel wear plate provides a smooth surface to ride against. There is a small spring that provides the return action of the trigger. <br><br><a href="http://www.servimg.com/image_preview.php?i=16&u=17228318" class="postlink" target="_blank" rel="nofollow"><img src="http://i42.servimg.com/u/f42/17/22/83/18/imag0624.jpg" border="0" alt=""></a><br><br>The grip is extremely comfortable, but I think I'll plan on putting a piece of material on the front of the trigger to give it a better profile, as it is only 1/8" thick material. <br><br>I have it banded up with a relatively light band set since I had it ready to go anyways. This thing is extremely fast. <br><br>Since the sliding fork has no lock yet, it feels more like a guided system to create a perfect pull every time rather than a crossbow. I'm open to suggestions on how to integrate a locking mechanism, and I may even replace the fork altogether, as it is a bit high and therefore shots very much to the right.
     
  2. Pikeman

    Pikeman New Member

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    That is a very cool looking shooter.
     

  3. CaptainBacon

    CaptainBacon Knowledgeable Man

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  4. tokSick

    tokSick Senior Member

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    Very nice.<br>The handle makes me think of a Thompson...
     
  5. CaptainBacon

    CaptainBacon Knowledgeable Man

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    tokSick, Thank you, I hadn't looked at it in that regard. I only created the gap for the fork to slide back farther.
     
  6. SkauneJohan

    SkauneJohan Member

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    you have copied my copy of the thompson <img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7"><br><br><br><br>very nice work btw <img src="http://illiweb.com/fa/i/smiles/icon_cheers.png" alt="cheers" longdesc="28">
     
  7. Alukuchen

    Alukuchen Senior Member

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    Woow! looks great!
     
  8. CaptainBacon

    CaptainBacon Knowledgeable Man

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    Thank you, Skaunejohan and Alukuchen1992.
     
  9. PDK73

    PDK73 New Member

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    Awesome looking xbow. I like the stock shape its very "black gun" military looking:lol: For the locking front end Joergs notch system is simplest I've seen but requires a thin sliding fork to rock back into the notch. If you make another out of metal you could also use an internal pin that locks into a hole in the rail (pretty sure thats how Joerg does his metal xbows). Another option is a pivoting hook on the fork slide that hooks onto a pin(s) on the rail or even onto the end of the rail. Since you can fabricate metal parts I'd do the internal pin. Cool.
     
  10. CaptainBacon

    CaptainBacon Knowledgeable Man

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    PDK73, I will probably resort to doing an internal locking pin of some sort. That was the plan with the now scrapped metal fork I first made for it. The only issue was finding a comfortable way to create a trigger for that as well, instead of having a rod stick out of the middle of the handle.<br><br>I have made two more before this one, each using the thin fork locking into a notch method.
     
  11. PDK73

    PDK73 New Member

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    The most logical/comfortable place for the front trigger/pin release? would be just under where your thumb rests naturally on the side of the handle. Obviously easiest with a tubular handle but that could be inside something more ergonomic/cool looking.
     
  12. CaptainBacon

    CaptainBacon Knowledgeable Man

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    I'm thinking about some sort of lever action hook that would engage the front end of the "barrel", requiring only a torsion spring to keep it closed. Disengaging it would essentially be a button press. All I have to do is bend a piece of steel, and mount it on a pivot.
     
  13. JoergS

    JoergS Administrator

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    By far the easiest lock is simply to file a notch/ramp into the front of<br> the "barrel". The rubber pull creates torque and the sled, whch would <br>automatically and very securely lock the sled in place. <br><br>This means that when pushed all the way to the front, the fork would <br>cant very slightly towards the shooter, locking itself into the notch. <br>Very much like I did that in this video:<br><br><embed pluginspage="http://www.macromedia.com/go/getflashplayer" src="http://www.youtube.com/v/zK2Bcn1ze4c" width="425" height="350" type="application/x-shockwave-flash" wmode="transparent" quality="high" scale="exactfit"></embed>
     
  14. CaptainBacon

    CaptainBacon Knowledgeable Man

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    Joerg, that would of course work if my sliding fork was more narrow. I followed that video to make my first Sling-x-bow. <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2">
     
  15. Ryan Wigglesworth

    Ryan Wigglesworth Senior Member

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    <div>Captain i salute you!</div><div class="clear"></div><div class="signature_div">
    <br><a href="http://voiceofquran.info/mp3_files/german_quran_mp3/001.mp3" target="_blank" rel="nofollow">http://voiceofquran.info/mp3_files/german_quran_mp3/001.mp3</a><br>my website! <a href="http://wigglesworthswoodwork.webs.com/" target="_blank" rel="nofollow">http://wigglesworthswoodwork.webs.com/</a><br>For your spiritual well being ( more important than anything ) <a href="http://muttaqun.com/" target="_blank" rel="nofollow">http://muttaqun.com/</a>
    </div>
     
  16. brat boon

    brat boon New Member

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    <div>nice<br>
    </div><div class="clear"></div><div class="signature_div">
    <br><strong>at school, I am a slingshot expert</strong> <img src="http://illiweb.com/fa/i/smiles/icon_biggrin.png" alt="Very Happy" longdesc="1"><br><br>on this forum a noob <img src="http://illiweb.com/fa/i/smiles/icon_neutral.gif" alt="Neutral" longdesc="20">
    </div>
     
  17. redneckozzie

    redneckozzie New Member

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    @captainbacon... Looks awesome, have you chrony tested it?
     
  18. bnorman

    bnorman New Member

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    @CaptainBacon: "and I may even replace the fork altogether, as it is a bit high and therefore shots very much to the right."<br><br>Add a little "Left Kentucky Windage" and it will shoot just fine.<img src="http://illiweb.com/fa/i/smiles/icon_razz.gif" alt="Razz" longdesc="9"><br><br>This is why most longbarrels are top-shot. That way the "rise" sutomatically contributes to "elevation" and doesn't contribute to "windage".<br><br>But I can appreciate the face-saving feature. On the other side, left-handed shooters might find this a tad uncomforatable.<br><br>I'd pop on a red-dot or some other type of scope, placing the center line of the scope on a bracket over the center line of the trajectory.<br><br>Who cares where the stick points if you hit what you aim at?<br><br>Really nice grip, trigger, stock and free-float barrel look.<br><br>bnorman