Pen Cannon

Discussion in 'Crazy contraptions' started by Oscar, Apr 16, 2016.

  1. Oscar

    Oscar New Member

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    Hello, I'm new to this forum but I did however found the slingshot channel on YouTube a few days ago and it's really funny to watch all the creations Jörg makes.

    I was getting a little bit inspired of this and I did search in some old supplies and found an old pen shooting rubber band powered gun. I built it a couple years ago and it still works pretty well.

    It's made to look a bit like the m1a1 Tommy gun. It can barely peirce corrugated fiberboard with a pen and it's really funny to shoot with it.

    Now I'm going to reconstruct this gun and see if I can make it fire pens that can pierce "wellpapp".
     

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  2. bigdh2000

    bigdh2000 Administrator

    Make sure to take lots of pictures.
     

  3. Oscar

    Oscar New Member

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    The old version is built with normal wooden plank 1x4 inches and sawed out with a handheld jigsaw <- according to google translate (I thought that was the protagonist in the saw franchise :p)

    Then holes were drilled and a pen shooting mechanism was added, it's pretty simple though hard to describe.

    The newer version is made out of plywood because I felt it was easier, also Jörg's videos on YouTube made me think plywood was a great material and clearly underrated by me.

    The first step was to take the handheld jigsaw and cut out the shape of the rifle, just about one meter long.
    Then two pieces of plywood to hold the barrel, a 20 centimeters long copper pipe in the smallest dimension, 8mm I think, it's however just so big that a pen can pass through without problems.

    Then these were put together with glue. Then the rifle was sawed off just above the handle to give room for the trigger mechanism, therefore two pieces of plywood was attached to the sides to give the rifle a more natural shape and lift up the plywood board from the barrel to the trigger.

    Then I was taking a coffee and stopped my work for that day :) stay tuned more is coming, trigger mechanism and rubber bands are coming soon.

    Any tips on good rubber bands from normal hardware stores?
     

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    Last edited: Apr 18, 2016
  4. Oscar

    Oscar New Member

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    The pen gun is a fail I must admit, I does actually peirce the corrugated fiberboard but the construction is too weak for the actual power, the glued plywood doesn't resist the power of the rubber, it's even supported by screws but it doesn't help.

    So I will probably make a new version with a more powerful design so it can fire the pens without destroying the construction itself.

    The pen was sharpened like a knife tip with two edges, a flat shape and this is how it looked after a hit.

    The normally sharpened pencils did create the small holes on impact and the flat sharpened created the bigger holes. No pencil went through but the did somehow stick in the wellpapp/corrugated fiberboard.
     

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  5. seppman

    seppman Folding-Ladder Expert

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    Keep on experimenting and have fun! That's what counts!