Mechanical Pencil Gun With Automatic Feed

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Introduction: Mechanical Pencil Gun With Automatic Feed

I modified beam's Mechanical Pencil Gun https://www.instructables.com/id/E46CF748H5EQZJIW1W/ to have an automatic feed with just two rubber bands, a mechanical pencil, and a bic pen, and some around the house appliances.

Step 1: Materials

For this project, you will need:

1 standard BIC mechanical pencil
1 standard PIC pen
2 rubber bands
1 drill with a drill bit the width of the pen
1 super glue or hot glue gun

Sorry I couldn't get a picture of the drill and the hot glue gun. I'm saying this because I am a very visual person and pictures help me very very much.

Step 2: Break Off the Front

Take the pencil and hold the bottom on a table and push against the top which is off of the table. The tip should crack of and the lead will pour out with the other parts of the pencil.

Step 3: Connect the Rubber Bands

Slit the eraser and slide the rubber band through it. Then use the other rubber band to keep the rubber band from sliding. Sounds a little confusing huh? ;) These pictures should help.

Step 4: Take Apart the Pen

Take apart every piece of the pen and lay them on your work table.

Step 5: Drill the Hole

Drill a hole in the pencil about the width of the pen. Pop the pen tube in and glue it in place.

Step 6: Place in the Automatic Feeder

Now place the ink tube in the pen tube pen point first. Wrap a rubber band around the tip. This will push the ammo down the tube into the barrel. You're finished!

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    62 Discussions

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    Dr J

    11 years ago

    i made this with other pens so that airsoft BBs can fit into it but when i pull the inner barrel, several BBs entered the shooting barrel. how to make it so that only 1 BB can enter the shooter at a time?

    11 replies

    u have to move the ammo feed back so it is just in front of where u pull the inerbarel about the length of the bb. also try not to tilt it down hope this makes sense if not just let me know if it help ill try to check back l

    that makes the whole firing process rather slow, i mean especially when it's in so much control and all... the angles i can't point at; how much further back i must pull the inner barrel and that makes it pretty much unflexible doesn't it? i think there could be a way to modify the area where the BB drops in, just so there can only be 1 BB in the shooting barrel at a time... good idea? i dunno, lol.

    i think there has to be some kind of shim inside that has a hole in it that fits on the wall that moves with the thing that you pull so that when you pull the trigger fast enough(or slow enough,) only one bb will get in because of the limited amount of time the hole in the shim will let a bb get inside the barrel. I'm gonna try make this with a shim... (next an automatic hehe.)

    hmm.. it never occurred to me that i could modify part of the inner barrel, the addition of a shim is a pretty good idea.

    easier drawn than made. for me, that is. i dont have any equipments to melt down plastics/heat em up for re-shaping guess what. i made my BB shooter entirely out of different kind of straws and paperclips and the rubber grip of pens, lol.

    i have made a spring loaded magazine that lays across the barrel with only the pen and the pencil and some spings from other pens.
    it does however take a good bit of cur pieces which make it run less smoothly but it still functions
    another thing i made was a removable and replacable magazine (more cutting)

    Ive been building something super similar and ran into the same problem. I am workingon a solution and am making progress. If i figure it out I'll let you know.

    it could always become a shotgun style one so when it loads multiple bb's for a buck shot effect and end up hitting multiple

    oh come on, you have to be a noob to cut yourself
    i have only ever used a knife to cut, no drill for me...

    to make it full auto try to hook it up to an airsoft gear-box.