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Build Log. Select fire airsoft/bb Bullpup

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Build Log. Select fire airsoft/bb Bullpup

Unread postAuthor: sinister_shadows » Sun Feb 24, 2013 3:28 am

So my thread was deleted without warning or reason, did i do something wrong? Anyway reposting.

Before i start this thread, i want to say a very big thank you to Zues, Jsr and Wyz2285, because without them this build would have never of happened.

The Idea
I come from the land of Oz, and sadly our government wont allow us to have airsoft guns. Ive always wanted one, so i decided if they wont let me buy it, ill build it. So the research began on a way to build what i wanted. Thats when i came across Wyz's youtube video about making a semi auto airgun with a qev and a 3way. i liked the idea but didnt like having to pull a sleeve to fire it. Along came the idea for a solenoid activated 3way.

All that was left was to find a way to be able to pulse a current to the solenoid to have select fire. Zues stepped up with the idea to control it via a 555 timer. This was a little above my electronics knowledge and parts availability, so he so graciously offered to build it for me. This is the heart of the gun, without it it would be just another semi.

I also wanted to build something that looked somewhat "real" rather then just a bunch of parts stuck together. After some searching i decided to stuff it all into the body of a Steyr, Australia's main service rifle. The steyr offered a fair but of room in the butt-stock for valves. tubing and an internal pressure tank. This gun will run of propane, mostly because i dont want to pump and id like to get a decent ammout of shots to a fill. Zues is also a key part to the internal tank, because i have no idea how to make it.

Parts
Looking in my ebay purchase history reveals 20 purchases for this gun, almost half of those being for the body

Main firing valve - 1/2" Qev
Pilot Valve - 24v 3way, 2 position solenoid valve
Connections - 8mm Tube Push-to-Connect Fittings, with nylon tube
Loading mechanism - Single Action Pneumatic Air Cylinder (if T-mag)
barrel - Carbon arrow shaft (i have plenty i cant use with my bow)
ammo - 6mm Steel bb. Airsoft bb i cant seem to find in Aus.
propane tank - 3/4 steel fittings, filled with liquid propane
Fire control unit - 555 timer courtesy of Zues
magizine - Still debating, possibly a T-mag or inline like this http://www.spudfiles.com/forums/semi-auto-bullpup-damage-videos-t24539.html

Aesthetics
As stated before, this will be mounted into the body of a 1-1 scale Styre, though i will be making some modifications. I would like to build a DMR version of a Styre. Using the wounders of pimp my gun, this is the design i think im going to go with.

integrated suppressor (most likley not real)
Side and under barrel Rails
Folding bipod
New folding front grip
Low profile laser
Air rifle scope
45 degree offset rail with Red-Dot sight

Currently the "supressor" Is as long as the body of the steyr, i dont know if i should shorten it or leave it

So im at the point of waiting for my parts to show up so i can start building.
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Last edited by sinister_shadows on Tue Feb 26, 2013 7:03 am, edited 1 time in total.
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Unread postAuthor: mr.potatohead » Sun Feb 24, 2013 11:41 pm

Very cool, do you live in cali? I herd they dont allow the sales of airsoft weapons but i deffinitly love the design of the body
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Unread postAuthor: sinister_shadows » Mon Feb 25, 2013 12:45 am

I live in Western Australia, sadly we have become a nanny country. Even the UK, who is part of the commonwealth, is allowed them, but we are not. Sad really. There are groups pushing for airsoft, but its still a long ways of.

And thanks for the positive on the bodt, wanted something a little different, so why not a DMR Steyr
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Unread postAuthor: Zeus » Mon Feb 25, 2013 1:18 am

Well considering I know a little about this movement, while we're still looking for airsoft to be legalised, after SA banning sub 180fps springers, it's not really a battle we can win in the short term. The KAP were on board last time I heard, and I think the Shooters & Fishers party were too, but it's not looking great.
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/sarcasm, /hyperbole
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Unread postAuthor: dewey-1 » Mon Feb 25, 2013 1:41 am

Zeus, I will post the schematic and board layout in this thread tomorrow.

What is the power source for the solenoid?
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Unread postAuthor: Zeus » Mon Feb 25, 2013 1:52 am

As I understand it's a 24VDC battery pack, I'm just going to chuck in a 7805 and use a 5V relay for the solenoid, I could use a 3055 too, see how it pans out.

Thanks again too
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/sarcasm, /hyperbole
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Unread postAuthor: jackssmirkingrevenge » Mon Feb 25, 2013 1:57 am

sinister_shadows wrote:And thanks for the positive on the bodt, wanted something a little different, so why not a DMR Steyr


Great movie.
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Unread postAuthor: sinister_shadows » Mon Feb 25, 2013 2:46 am

Zeus wrote:I'm just going to chuck in a 7805 and use a 5V relay for the solenoid, I could use a 3055 too, see how it pans out.
o


This makes my face go 0.o

and i guess i owe you a big thank you also dewey if your doing up the schematic for the timer ^_^

The solenoid runs of 24vdc, so im going to make up a battery pack for it

and have not seen the movie JSR, but that bipod looks horrid :P
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Unread postAuthor: jackssmirkingrevenge » Mon Feb 25, 2013 2:57 am

It's the standard HBAR variant bipod:

Image

I would think the shape allows it to act as a heat sink to help with barrel cooling.
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AC or DC

Unread postAuthor: Technician1002 » Mon Feb 25, 2013 3:29 am

Is that pilot valve rated for AC or DC? If DC, you will want to use the 24V as specified. If it is an AC valve, you can use quite a bit less DC voltage due to the DC resistance is lower than the AC impedance.
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Unread postAuthor: sinister_shadows » Mon Feb 25, 2013 3:59 am

this is the valve, says dc. it was the only one i could find that was solinoid 3way, two position that used 1/4 fittings. Otherwise i would have just gone with a 12v

http://www.ebay.com.au/itm/380530075392 ... 984wt_1083

And yeah im sure there is a reason to the bipods shape, im just not a fan personally :P
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Unread postAuthor: dewey-1 » Mon Feb 25, 2013 4:25 pm

Here is the schematic and board layout.
Note there is a component view and a bottom foil view.
I recommend the "safety switch" on the 24V supply because the 555's have a tendency to "pulse on" during power up.
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Zeus-Schematic-555-24v-sol.jpg
Zeus-555-24v-sol.png
Zeus-555-24v-sol-bottom.png
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Unread postAuthor: Zeus » Mon Feb 25, 2013 4:58 pm

Fantastic, much appreciated. I'll use it for driving a solenoid acting on a hammer valve at some point too, makes life a lot easier.
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/sarcasm, /hyperbole
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Unread postAuthor: sinister_shadows » Mon Feb 25, 2013 11:36 pm

Zues, I will probly get u to make another later when I start another build, for the same reason (solenoid striking a hammer)

Safety is a big one, would like to have a working safety switch so the gun can't be accidentally discharged.

And those diagrams make no sense to me :shock:
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Unread postAuthor: wyz2285 » Tue Feb 26, 2013 6:58 am

Use a solenoid to open a hammer valve is not that easy, at least from my experience. Zeus if you have time do you want to build a circuit for me too? It's similar to this one, I think we can work out a price.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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