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The Micro-MarbleGun

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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The Micro-MarbleGun

Unread postAuthor: VH_man » Mon Mar 17, 2008 6:44 pm

Well, In my recent dismay of having my Beloved Barrett 14mm Break, i decided i wanted to do something different..... SO

I took spare parts, (literally Spare parts) and Constructed This little beast.
I say beast not becuase of power, but the kick is ENORMOUS for such a small gun........

Name: The "MiMg" (or "deathstick" as my dad calls it)
Pressure Chamber Material: 1 Inch Pressure Rated PVC
Barrel: 10 inches of 1/2 inch Type M Copper
Valve Type: Piston
Piston Material: Epoxy/Syringe Head
Pilot/fill Valve: Presta Fill Valve

Below Are some Pics. Vids will be up shortly. No damagepics tho, Sadly GGDT estimates this bugger at about 400 FPS (not good enough for me).

(EDIT) I replaced the Presta fill valve with a Schrader valve because i recently had an instance where i dropped it and i kinda got... a marble.... through.... the.... roof....... and the floor above it....
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Attachments
IMG_0156.jpg
The Piston In its Housing (note its a Syringe Tube....)
IMG_0156.jpg (27.35 KiB) Viewed 2133 times
IMG_0153.jpg
My Sexy Piston (blurry Pic sorry)
IMG_0153.jpg (24.74 KiB) Viewed 2133 times
IMG_0142.jpg
how you Hold/Fire the MiMg
IMG_0142.jpg (26.85 KiB) Viewed 2133 times
IMG_0157.jpg
The Gun in its Miniature Black Beauty.....
IMG_0157.jpg (29.39 KiB) Viewed 2133 times
Last edited by VH_man on Wed Mar 19, 2008 11:46 am, edited 1 time in total.
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Unread postAuthor: elitesniper » Mon Mar 17, 2008 6:47 pm

nice little plinkee you gots there :),but you can do better then 400fps com on crank up the pressure a little since its 1'' pvc :D
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Unread postAuthor: VH_man » Mon Mar 17, 2008 6:50 pm

I did try 200 PSI in it just 2 minutes ago and the sound nearly made my ears explode....... And i broke the Pressure Guage on my Pump........
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Unread postAuthor: elitesniper » Mon Mar 17, 2008 6:52 pm

Now thats the kind of stuff I want to hear :wink: except for the broken gauge :)
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Unread postAuthor: bigbob12345 » Mon Mar 17, 2008 6:57 pm

200psi is a bit much but nice mini coax.
you could have made the chamber 1.25in pvc which would get that higher velocity you are talking about and a longer barrel would help the power too.
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Unread postAuthor: elitesniper » Mon Mar 17, 2008 6:59 pm

But, bigger chamber means lower pressure you will be able to take it to :? more pressure better :)
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Unread postAuthor: bigbob12345 » Mon Mar 17, 2008 7:05 pm

Why does it mean you will be able to take it to a lower pressure I would say 1.25 pvc at 180psi max would be alright.
Anyway i doubt he will be trying 200psi anymore cause of the gauge failure.
and more volume is almost as good as more pressure
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Unread postAuthor: elitesniper » Mon Mar 17, 2008 7:10 pm

Yea, but the last sentence is not entirely true :) , a small chamber a very high pressures perform better then a launcher with a high volume chamber and a lower pressure.
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Unread postAuthor: VH_man » Mon Mar 17, 2008 7:28 pm

Meh, For just kinda carrying around with my hand pump and a bag of marbles, its great......

im intruiged by the power of this though. I think i might make one out of Steel/Copper and pull it up to 500-600 PSI........... and a proper pistol grip. My goal would be SUPER recoil.
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Unread postAuthor: bigbob12345 » Mon Mar 17, 2008 7:31 pm

elitesniper wrote:Yea, but the last sentence is not entirely true :) , a small chamber a very high pressures perform better then a launcher with a high volume chamber and a lower pressure.


I said almost
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 18, 2008 2:31 am

*sniffle* I'm so proud :cry: :wink:
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Unread postAuthor: VH_man » Tue Mar 18, 2008 4:55 am

You gave me the idea :D be more proud of yourself for coming up with it.

BTW i Reccomend this style of piston to EVERYONE. it has not failed me yet, and this piston has been through about 3 different guns and 300 PSI now....
(also, i found that if you dont align the syringe head perfectly, it doesnt seal perfectly, making it a perfect piston sealing face........)

EDIT: I tried a Steel Marble in this thing this morning......... Nothing wakes you up (and puts a smile on your face) like riddiculous recoil.......... :twisted:
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 18, 2008 5:10 am

What are you doing for equalisation?
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Unread postAuthor: VH_man » Tue Mar 18, 2008 5:19 am

VH_man wrote: (also, i found that if you dont align the syringe head perfectly, it doesnt seal perfectly, making it a perfect piston sealing face........)


I guess i didnt explain it extremely well.

what i did, was put the syringe head in, then just "poke" one little side of it so it doesnt seal 100%. basically, that syringe head isnt entirely straight.

It was more dumb luck though, i intended this piston to be Airtight initially :)
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Unread postAuthor: fireman565 » Tue Mar 18, 2008 11:56 pm

That's a neat little toy for spare parts VH... :lol: Keeping it compact would be my main priority, for convenience.
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