How to Make a Small Spring Cannon





Introduction: How to Make a Small Spring Cannon

For shooting marbles, erasers, pickle harpoons, and other small things.

Step 1: Gather Supplies

you will need these things for this project;

wire hangar
1/2 in copper pipe
1/2 in wooden dowel


bandsaw (or hacksaw)
wire cutters

Step 2: Cut the Pipe

cut about five inches off of the pipe.

about 1 1/2 inches down the pipe cut halfway through

then cut down the middle of it until you reach the second cut.

it should look like this.

Step 3: Make the Spring Assembly

cut a 1/4 in piece off the dowel

drill a 1/16 hole in the center.

cut the straight part of the wire hanger

use the pliers to bend 1/4 in of the end at a right angle

put the wire through the wood an the spring

Step 4: Finish It

use the pliers to crush the pipe at the 1/2 cut part. (not all the way)

put the spring assembly in the pipe.

pull it down to where it starts to compress the spring.

and bend the wire.

cut the excess wire

Step 5: How to Fire

pull the bent wire back and turn it so it catches on the half pipe

load it

give the bent wire a half turn to shoot



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    what size spring did you use

    awesome. Im making a pickle harpoon. but i need to know, where did the spring come from? 8/10

    4 replies

    ...Pickle Harpoon?

    Yep, Pickle Harpoon. :D


    Go to a lumber store or go to Home Depo and you will have lots of sizes and tentions. they are about 1 to 3 dollors.

    1 reply

    I actually tried my home depot, they didn't have it. Maybe it depends on what part of the country you're in.

    Nice job! 8/10. What/where did you get that spring from?

    1 reply

    Oh how i love this. ButONE thing, this is somewhat like camster911 bb gun thingy!?!?!?!?!? i dunno wat ver good job

    try to make a much larger one with aam old car spring and a winch

    When i was small my mates dad made one of these but it had hadles. I have always want to know how to make one. Nice1

    I don't understand this one. How does the clothes hanger do anything? Does it pull the spring back?

    2 replies

    yup, the spring is between the crushed end of the pipe and the piece of dowel. You pull the end of the hanger piece back to load the spring, and turn it around so it's hanging on the extended piece of the pipe to ... cock it? (terminology fails me) To fire it, you push (turn) the hanger wire off the ledge of the pipe to let the projectile fly.

    you should make one big enough to use an old spring from an airsoft gun (i would use two) and one verry good place to get springs is your local hobby shop under rc car parts

    i used airsoft bb's because i made my gun from straws

    i just made one and it works out great but what other things can it shoot