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Can someone good help me ? please

Built a BB Machine Gun? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Re: Can someone good help me ? please

Unread postAuthor: Anatine Duo » Mon Apr 08, 2019 7:01 pm

Modify blowgun for better flow.
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Re: Can someone good help me ? please

Unread postAuthor: jackssmirkingrevenge » Tue Apr 09, 2019 5:27 am

Anatine Duo wrote:Modify blowgun for better flow.


That would be a way to optimize it but there's probably some restriction here that we're not seeing. At 120 psi he should be seeing good performance regardless given the chamber size, barrel length and QEV.

That being said, 8mm counts as "small caliber" in the spudgun world and 120 psi is relatively low.

Here is a GGDT model guesstimated from what we can see in the thread:

Image

10 ft lbs isn't really that much, heck they'll let you own that in the UK without a loicense!

I think Haniball1337 should be looking for a higher pressure source, maybe a fridge compressor as popularized by his fellow countryman.
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: Can someone good help me ? please

Unread postAuthor: Haniball1337 » Tue Apr 09, 2019 8:34 am

that china qev would be able to hold 450 psi?? Air blowgun is for 12 bars , qev for 8 bars

Will Beto SP-002AG 28bar shock pump be able to pump 28 bar to chamber or this is fake? and this will happen


If i will put bigger chamber i will get more power?
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Last edited by jrrdw on Tue Apr 09, 2019 4:21 pm, edited 1 time in total.
Reason: Triple post. Fixed video tag.

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Re: Can someone good help me ? please

Unread postAuthor: jackssmirkingrevenge » Wed Apr 10, 2019 7:08 am

Haniball1337 wrote:that china qev would be able to hold 450 psi?? Air blowgun is for 12 bars , qev for 8 bars


While exceeding the manufacturer's specifications is never advisable, QEVs of this design have been taken beyond 500 psi by the members of this forum. As to the blowgun, this will be too hard to operate at this pressure so a ball valve pilot would be a better idea.

Will Beto SP-002AG 28bar shock pump be able to pump 28 bar to chamber or this is fake? and this will happen


Your chamber is too large for a shock pump, it will take you forever to reach 450 psi.

Your best bet is an airgun pump like this one, alternatively a fridge compressor is a way to get that pressure easily and cheaply as per POLAND_SPUD's tutorial.

If i will put bigger chamber i will get more power?


Not really, more pressure is the solution. Alternatively, if this is not an option, consider going up in caliber. If you keep the same setup but change for a 19mm barrel firing 0.75" steel balls, you will get double the muzzle energy.
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: Can someone good help me ? please

Unread postAuthor: Haniball1337 » Wed Apr 10, 2019 9:15 am

https://www.youtube.com/watch?v=YwiHi2oeABA Slide valve is good too but , how is this working? He have compressor Hooked up and he is shooting all the time ? Can someone explain me ,
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Re: Can someone good help me ? please

Unread postAuthor: jackssmirkingrevenge » Wed Apr 10, 2019 9:44 am

The slide valve simultaneously shuts off the air supply from the compressor and vents the pilot to the atmosphere, here's an animation by clide that explains it quite clearly:

Image
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: Can someone good help me ? please

Unread postAuthor: Haniball1337 » Wed Apr 10, 2019 11:48 am

So if i will do that it will work? (This is bicycle valve ), If i good understand the air doesnt go behind the slide valve but from above? So if i understand it can be little better than that one with air compressor gun ?
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Re: Can someone good help me ? please

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Re: Can someone good help me ? please

Unread postAuthor: jackssmirkingrevenge » Thu Apr 11, 2019 6:35 am

Technically it's more like this but yes, you get the idea. It will work as you drew it.

Image
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: Can someone good help me ? please

Unread postAuthor: Haniball1337 » Mon Apr 15, 2019 12:14 pm

i wanted to make something similar to this https://www.youtube.com/watch?v=f-oLNBVWRgY&t=480s , if i will do that it will work? It will be multi shot? I want to use 8 bar pressure

Picture: https://zapodaj.net/2c9fa8a553649.jpg.html
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Re: Can someone good help me ? please

Unread postAuthor: jackssmirkingrevenge » Tue Apr 16, 2019 5:32 am

It will work, but are you actually planning on using a plastic bottle as a reservoir? You're better off locating a paintball bottle or fire extinguisher, something that will take higher pressure and possibly including a regulator to give you more shots per fill.
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: Can someone good help me ? please

Unread postAuthor: Haniball1337 » Tue Apr 16, 2019 5:56 am

I think i will use fire extinguisher , i want only to get 3-4 shots like him
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Re: Can someone good help me ? please

Unread postAuthor: Haniball1337 » Wed Apr 24, 2019 1:30 pm

So i came up with this :D I think it is good , i can hit the can of pineapple from 20 meters ;D
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Re: Can someone good help me ? please

Unread postAuthor: farcticox1 » Wed Apr 24, 2019 4:45 pm

I like it :D maybe something over the screw/trigger :idea:

Reminds me of a Thompson, that's a good thing.

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Re: Can someone good help me ? please

Unread postAuthor: Haniball1337 » Thu Apr 25, 2019 7:27 am

Thanks guys for help :D
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Re: Can someone good help me ? please

Unread postAuthor: jackssmirkingrevenge » Fri Apr 26, 2019 6:05 am

Good job! Now find yourself a high-pressure pump and do some real damage :D
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