Electronic trigger

Discussion in 'New project ideas' started by oldcannon, Mar 4, 2013.

  1. oldcannon

    oldcannon New Member

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    I am building a slingshot cannon for a demonstration for school groups. <br><br>The cannon is suppose to function as much as possible as a "real" cannon but without the explosives!<br><br>I built one using compressed air but i dont like the hose - compressor - etc.<br><br>So i have built one using a slingshot mechanism that fires 30mm cannon balls about 10 meters - which is perfect but i need a better trigger solution.<br><br>I now use an electromagnet and a steel plate on the band. So the kids put the cannon ball in barrel and push it back with a ram rod. This puts the band under tension and eventually the steel contacts the magnet which holds the band back ready to fire<br><br>Then the kids can "light" the fuse which cuts power to the electromagnet and out comes the cannon ball. <br><br>I am wondering if there is a better electronic trigger system. The steel on the band is robbing me of some of my power and also is harder on the gun because of the weight of the steel moving forward. <br><br>I have electricity - i am looking for an electric trigger system to replace my electromagnet. Ideally i can just buy the assembly - maybe it was designed for a different purpose? I can also build a trigger if i had a good design as well. <br><br>the pull strength is about 10kg<br><br>Thanks for your help!
     
  2. FIAAO

    FIAAO Failureisalwaysanoption

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    Maybe something like this? Sorry for bad drawing...<br><br><img src="http://i72.servimg.com/u/f72/17/50/40/49/electr10.png" border="0" alt="">
     

  3. oldcannon

    oldcannon New Member

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    Looks good! Thanks. Is there a standard design that i can modify? I guess most of the standard triggers would work I just need to add the magnet..or i guess a solenoid word work too! <br><br>Thanks any more tips you can provide would be great..thank you!
     
  4. Flipgun

    Flipgun Well-Known Member

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    <div>
    <a href="http://www.straightdope.com/columns/read/974/how-do-human-cannonballs-survive" target="_blank" rel="nofollow">http://www.straightdope.com/columns/read/974/how-do-human-cannonballs-survive</a><br>Brought to you by Barnum and Bailey!</div><div class="clear"></div><div class="signature_div">
    <br>Failed perception is when you have a gun, I have a slingshot and you think you are the only one that is armed. <img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7">
    </div>
     
  5. JoergS

    JoergS Administrator

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    I don't think that magnets are a viable option for this. They would need way too much power to be efficient. <br><br>Why not using a simple lever/sear combination? You could attach a length of rope so the cannon can be fired from a safe distance. The 10 kg draw force is no problem at all for a wooden sear/trigger lever. One part, really.<br><br>If you must use something electric, then I recommend a normal lever and a drill to press it. Much like the setup I use for my full auto slingshot. You press down the pouch/string until the trigger/sear catches. Then you pull the drill button, a disk turns that presses on the trigger. The shot falls.<br><br>See the pdf I made for the full auto barrel part - that is the way to go.<br><br><a href="https://docs.google.com/file/d/0B2lOiwtIPanYT0FHdlhpekVLYmc/edit?usp=sharing" target="_blank" rel="nofollow">https://docs.google.com/file/d/0B2lOiwtIPanYT0FHdlhpekVLYmc/edit?usp=sharing</a>