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Step 3The Silencer
Pretty much the same base parts of the spud gun itself, a cheap Bic pen and a washable Crayola marker. Take out all of the insides of both, discard the whole tip of the pen, the ink tube, and the end plug of the pen then remove the tip of the marker and the insides by popping out the end plug (without destroying it) and removing the ink sponge/tube/cartridge by the means of pounding the open end of the marker on the table or tweezers using common sense to guide you.
Take the Crayola marker and ream the insides mostly the part where the tip was so it can fit the Bic pen through
Make another hole big enough in the end plug (not the cap), in the center to fit the pen all the way through
Take the hollow pen tube and using an exacto blade or a sharp point razor blade, make a series of tiny counter-sunk holes (not depicted, too lazy to post new pics) about 3-4mm in diameter down the sides of the pen tube leaving about 1 1/2 inches of clear (no hole) material at the end of the bore and at the tip of the muzzle.
Make sure there is no debris or burrs on the inside of the barrel and that the barrel didnt warp from cutting or anything else.
Push (pound, an airtight fit is best) the pen tube into the marker about 1cm passed (further inside) the rim where the marker tip used to be, this makes it so you can attach the silencer to the barrel of the mini spud gun.
Replace (pound) the end plug (again, not the cap) back into the marker making sure the pen tube goes through the hole in the end plug, that the pen tube is still recessed 1cm below the rim at the tip, and that you didnt mar the muzzle of the silencer.
There will be about a cm (idk, I dont remember) of the pen tube protruding from the face of the silencer, remove it if you wish but take special caution not to ruin the muzzle and that you dont leave burrs on the inside of the barrel as it may hinder the already ghetto enough spud guns performance.
Affix the silencers end with the neck onto the muzzle of your miniature spud gun, make sure that the main and silencer barrels are flush against each other or to be fancy, put a rubber gasket between the inside rim of the pen tube and the muzzle of the barrel attached to the chamber with the inside diameter smaller than the bore and ghettolectric tape the silencer to the barrel attached to the chamber and check once more for a flush fit for a more permanent silencer. I usually shorten the main barrel between the silencer and the chamber so that the propellant would have enough room to push the projectile out of the barrel and the silencer.
It still hurts according to the decibels and multitudes of profanity in the general area and the velocity of various hand held objects being thrown back my general direction after firing rather well placed shot in my little sisters abdomen. It doesnt really make the spud gun quieter. Although, in some test/curiosity/boredom fires the only things heard from the spud gun was the piezolectric igniters striker being hammered onto the unseen inside surface while hearing the wire spark and the sound of a either a shriek or a projectile hitting a surface confirming that the projectile has in fact left the silencer and that the projectile gains a reasonable to slightly peculiar, higher or lower amounts of distance to hit its intended target or any other object in your general direction. It kinda alters the sound created by firing the spud gun in a weird, trippy way.
Try putting an ever so slight choke in the end of the main muzzle bore, the tube attached directly to the chamber, choke the business end of the main barrel as if the silencer wasnt there somehow, the projectile requires more pressure to escape the barrel because the choke slightly obstructs until a certain pressure is reached, this makes the expanding gas from the propellant build up in the barrel and if the alteration is done correctly the extra pressure will force the projectile out of the muzzle at a higher velocity. This requires X or lower (x= how much expanding gas it takes to fill the barrel and a little excess just for good measure) volume in milliliters not decibels inside the barrel and in any cavities the gas may take up inert space such as the cavity between the inside walls of the marker and the surface of the pen tube inside of the silencer you are in the process/decision/satisfaction-of-completion of making. If theres too much volume the gas expands and diffuses in the inert space in the barrel and silencer so you end up with a squib round (a projectile that has failed to leave the barrel) or poor velocity resulting in a weak shot. The preferred amount of volume is determined by the size of the chamber and how much the propellant expands after ignition. Lets say Assy.A has a big chamber with a weak propellant has moderate to poor performance and Assy.B has a strong propellant in a small chamber, Assy.B could have the same or more likely more velocity than Assy.A. The overall quality and performance of this spud gun relies on the kind of junk you have around and the kind of toys you own.
Take the Crayola marker and ream the insides mostly the part where the tip was so it can fit the Bic pen through
Make another hole big enough in the end plug (not the cap), in the center to fit the pen all the way through
Take the hollow pen tube and using an exacto blade or a sharp point razor blade, make a series of tiny counter-sunk holes (not depicted, too lazy to post new pics) about 3-4mm in diameter down the sides of the pen tube leaving about 1 1/2 inches of clear (no hole) material at the end of the bore and at the tip of the muzzle.
Make sure there is no debris or burrs on the inside of the barrel and that the barrel didnt warp from cutting or anything else.
Push (pound, an airtight fit is best) the pen tube into the marker about 1cm passed (further inside) the rim where the marker tip used to be, this makes it so you can attach the silencer to the barrel of the mini spud gun.
Replace (pound) the end plug (again, not the cap) back into the marker making sure the pen tube goes through the hole in the end plug, that the pen tube is still recessed 1cm below the rim at the tip, and that you didnt mar the muzzle of the silencer.
There will be about a cm (idk, I dont remember) of the pen tube protruding from the face of the silencer, remove it if you wish but take special caution not to ruin the muzzle and that you dont leave burrs on the inside of the barrel as it may hinder the already ghetto enough spud guns performance.
Affix the silencers end with the neck onto the muzzle of your miniature spud gun, make sure that the main and silencer barrels are flush against each other or to be fancy, put a rubber gasket between the inside rim of the pen tube and the muzzle of the barrel attached to the chamber with the inside diameter smaller than the bore and ghettolectric tape the silencer to the barrel attached to the chamber and check once more for a flush fit for a more permanent silencer. I usually shorten the main barrel between the silencer and the chamber so that the propellant would have enough room to push the projectile out of the barrel and the silencer.
It still hurts according to the decibels and multitudes of profanity in the general area and the velocity of various hand held objects being thrown back my general direction after firing rather well placed shot in my little sisters abdomen. It doesnt really make the spud gun quieter. Although, in some test/curiosity/boredom fires the only things heard from the spud gun was the piezolectric igniters striker being hammered onto the unseen inside surface while hearing the wire spark and the sound of a either a shriek or a projectile hitting a surface confirming that the projectile has in fact left the silencer and that the projectile gains a reasonable to slightly peculiar, higher or lower amounts of distance to hit its intended target or any other object in your general direction. It kinda alters the sound created by firing the spud gun in a weird, trippy way.
Try putting an ever so slight choke in the end of the main muzzle bore, the tube attached directly to the chamber, choke the business end of the main barrel as if the silencer wasnt there somehow, the projectile requires more pressure to escape the barrel because the choke slightly obstructs until a certain pressure is reached, this makes the expanding gas from the propellant build up in the barrel and if the alteration is done correctly the extra pressure will force the projectile out of the muzzle at a higher velocity. This requires X or lower (x= how much expanding gas it takes to fill the barrel and a little excess just for good measure) volume in milliliters not decibels inside the barrel and in any cavities the gas may take up inert space such as the cavity between the inside walls of the marker and the surface of the pen tube inside of the silencer you are in the process/decision/satisfaction-of-completion of making. If theres too much volume the gas expands and diffuses in the inert space in the barrel and silencer so you end up with a squib round (a projectile that has failed to leave the barrel) or poor velocity resulting in a weak shot. The preferred amount of volume is determined by the size of the chamber and how much the propellant expands after ignition. Lets say Assy.A has a big chamber with a weak propellant has moderate to poor performance and Assy.B has a strong propellant in a small chamber, Assy.B could have the same or more likely more velocity than Assy.A. The overall quality and performance of this spud gun relies on the kind of junk you have around and the kind of toys you own.
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Nov 22, 2010. 6:53 PMcheeksyb
says:
me and my brother juss started makin mini potato gun and we both enjoy them but have a hard time finding good ammo...i want something big enough for tacks :) or something strong enough to kill a small animal (squerall or chipmunks) their over populated in michigan!! But this site has helped me and has my interest in makin this a hobby... I plan on making a large one... But I want 1 for snowballs/iceballs as well!!
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3
Feb 26, 2010. 2:35 PMdragonwarrior3000
says:
Silencer?!?!?!?!?!?!? thats pretty hardcore if u ask me
Reply
Sep 11, 2009. 2:18 PMtochdown my pants
says:
how do you put the sileser on???????
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1
Nov 16, 2008. 11:39 PMShadowfury
says:
I constructed this silencer, albeit with modifications, and it works great! All I hear is the igniter. Great job. ~SF~
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1
Nov 26, 2008. 3:01 PMGrim (author)
says:
Really?! Hmm, its about time somebody tried it besides me. Any chance on pictures?
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