Ammo & Materials

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SpudFiles Potato Gun Commercial

Last post by quinn whitsitt
Posted in Combustion Cannons
Replies: 15
by PCGUY » Tue Oct 29, 2013 10:54 pm » in Combustion Cannons
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I've been wanting to get in some spud shooting action this fall before the weather got cold. I know it's been a while since I filmed anything for...

Last post

thank you for creating this website is there anything i can do to help
15 Replies

942789 Views

Last post by quinn whitsitt
Fri Feb 09, 2024 2:38 pm
PVC Pipe Info

Last post by PCGUY

by PCGUY » Wed Oct 09, 2013 1:38 pm

PVC Pipe Info

PVC is used by plumbers, pool installers, and so on, and local building and construction regulations set the safety and materials...

0 Replies

62354 Views

Last post by PCGUY
Wed Oct 09, 2013 1:38 pm
The Offcial Machinist Thread: Revised 01/04/2014

Last post by Yexinss
Replies: 1097
by jrrdw » Tue Aug 02, 2011 5:54 am
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This is where members who need help getting machining done to their spudgun parts. There will be some guide lines and they are as follows:...

Last post

As my title described, 2k for modifying Daytona Recoil system to shoot Nerf darts. Full mechanical no wires no battery only HPA. If you can machine...
1097 Replies

823795 Views

Last post by Yexinss
Wed Aug 25, 2021 12:22 pm
Good Deals Thread

Last post by PaperNinja
Replies: 41
by clemsonguy1125 » Wed Aug 11, 2010 8:01 pm
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I keep seeing good deals on ebay for cheap parts that would be great for spud guns but not the kind I build. I figured it would be a good idea to...

Last post

$550 4500psi compressor
41 Replies

195437 Views

Last post by PaperNinja
Wed Dec 05, 2012 7:08 pm
Launcher Failure Analysis Log

Last post by SEAKING9006
Replies: 32
by Velocity » Sun Apr 15, 2007 11:28 am
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First post

The idea behind this thread was taken directly from a sticky on the Spudtech forums, seen at I, along with several other members, believe that this...

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I never made my inside out sleeve valve because I didn't know how to use o-ring, most important of all don't try gluing them in place, second if its...
32 Replies

221522 Views

Last post by SEAKING9006
Fri Jun 27, 2008 8:11 pm
Golf Ball Barrel FAQ

Last post by K8TOW
Replies: 34
by squeaks » Wed Jan 24, 2007 6:42 pm
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Okay, so one of the most asked about barrel is the golf ball barrel. Here are some frequently asked questions(and some unfrequent ones too).

Q: Why...

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I use pvc plugs and caps
34 Replies

315098 Views

Last post by K8TOW
Thu Mar 16, 2023 5:22 am
Ammo Ideas

Last post by quinn whitsitt
Replies: 359
by PCGUY » Tue Apr 04, 2006 10:48 am
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First post

Ammo

I have put together a few ammo ideas for different size barrels. All pipe is PVC unless otherwise stated. If you think any ammo ideas should...

Last post

help sorry i typed to fast
359 Replies

5182021 Views

Last post by quinn whitsitt
Thu Feb 15, 2024 11:44 am

Topics

Aluminum Extrusion for Barrel Material

Last post by Cthulhu
Replies: 10
by hwmetzger » Tue Nov 21, 2017 8:09 pm

First post

Hello guys, first post here!

I was recently given some heavy aluminum extrusions that I thought would make a fantastic barrel for a higher pressure...

Last post

And any suggestions for general build style here? I'd hate to use these for a run of the mill gun :D

You know what would be awesome, a Wall Gun...

10 Replies

6832 Views

Last post by Cthulhu
Thu Nov 23, 2017 11:36 am
Melting PVC

Last post by hopelesslyillbred
Replies: 30
by SEAKING9006 » Thu Aug 21, 2008 3:10 pm
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I have been contemplating the use of PVC for coating or casting applications, like reinforcing the outer walls of a shell made of flour, water and...

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Not to be a spoilsport, but melting PVC will give off chlorine gas, carbon monoxide, and maybe a very small amount of phosgene gas. Chloroform...
30 Replies

59411 Views

Last post by hopelesslyillbred
Wed Jul 12, 2017 5:23 am
Saboted canister shell help

Last post by Sear
Replies: 3
by Cthulhu » Thu Jun 22, 2017 7:38 am

First post

I want to create a sort of canister or grapeshot round for my cartridge combustion Spud Howitzer that can rain paintballs at a distance.

While I...

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There is another risk you should be aware of when designing paintball canister rounds. During the acceleration the upper paintballs will crush the...

3 Replies

4282 Views

Last post by Sear
Fri Jun 23, 2017 4:34 am
How Do Threads Affect How Pipe Handles Pressure?

Last post by Hurricane Air Arms
Replies: 7
by WizardNoodle » Sat Apr 29, 2017 10:38 pm

First post

So I am going to be making a piston hybrid cannon over the summer, and have pretty much finished all of the designing of the cannon. I want the...

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I would make a conscious effort to replace any PVC with copper or steel. Then buy a tap/dye kit and thread it yourself because tbh, a PVC explosion,...

7 Replies

8549 Views

Last post by Hurricane Air Arms
Sun May 14, 2017 9:00 pm
Barrel Torque

Last post by D_Hall
Replies: 12
by Trauts » Wed Apr 05, 2017 3:57 pm

First post

Untitled.png

I am making a bolt action mechanism and I am concerned about forces on the barrel.

In most bolt actions I've seen people using a...

Last post

Force is applied (air pressure) to the barrel and it is only held from moving forward because of the bolt. This bolt would be held via the frame and...

12 Replies

8470 Views

Last post by D_Hall
Thu Apr 06, 2017 10:42 am
2.5" PVC to 2" threaded male adapter - more elegan

Last post by Gippeto
Replies: 11
by NewMexicoJoe » Thu Jul 12, 2007 8:26 am

Hey everyone - just transferred over from Spudtech. Sad to see they're more or less closing down.

I just found a length of 2.5 PVC - no small feat...

11 Replies

8756 Views

Last post by Gippeto
Fri Jan 06, 2017 1:47 pm
Is a Non-rated Pipe Safe if I Pressure Tested It?

Last post by Labtecpower
Replies: 7
by Xamllew » Mon Oct 31, 2016 6:28 pm

First post

Hey guys, I found a nice seamless steel pipe in the trash the other day, aside from some light surface rust I was thinking it would make an excellent...

Last post

I'd trust it, the burst pressures on these pipes are higher than you'd expect. I've taken 30x0,5 mm aluminium pipe up to 400 PSI, not advising you to...

7 Replies

7006 Views

Last post by Labtecpower
Tue Nov 08, 2016 5:48 am
3/4" or larger QEV without breaking the bank?

Last post by sharpshooter
Replies: 4
by sharpshooter » Tue Oct 18, 2016 10:17 am

First post

I'm looking for a pair of 3/4 or 1 (20-25mm) QEV valves for a double barrel build. Everything I see that can handle ~200 PSI is over $100 per valve....

Last post

There's no doubt that I can build the valves, but time is such a limited resource.

4 Replies

6273 Views

Last post by sharpshooter
Wed Oct 19, 2016 12:46 pm
Teflon lined barrel

Last post by matti
Replies: 1
by Doodmens » Wed Sep 28, 2016 8:51 am

First post

Hello,

I noticed that teflon and steel have a very low friction constant (0.05), and I was wondering if you could line a barrel with teflon (or make...

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Unfilled teflon (ptfe) wears quite fast and is pretty soft, making it not suitable for barrel.. better way would be teflon sabot or sleeve on the...

1 Replies

4346 Views

Last post by matti
Thu Sep 29, 2016 1:24 am
Looking for Materials for a Compact Coaxial Design

Last post by jackssmirkingrevenge
Replies: 7
by Xamllew » Sun Aug 21, 2016 11:19 pm

First post

Hello everyone, new to airgun construction. I'm looking to start work on a .45 cal coaxial piston airgun. What I would like to know is where I can...

Last post

...more reliable (JMO :wink: ) than epoxy.

Having had my fair share of close shaves I'm not about to argue with that, however virtually all...

7 Replies

6404 Views

Last post by jackssmirkingrevenge
Wed Aug 31, 2016 9:30 am
The fun things your colleagues bring you...

Last post by chaos
Replies: 29
by jackssmirkingrevenge » Fri Nov 26, 2010 12:19 am
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... when they know you're into projectiles :)

Shame I don't have a 3 barrel :roll:

Last post

I may be back.. right now it is a fortnight fling.. but i feel like building somthing that could remove fingers if needed...
29 Replies

20410 Views

Last post by chaos
Sat May 07, 2016 11:32 am
6mm Tubes (Aus) + Perfect Sealing Brass for breaches, bolts.

Last post by Hurricane Air Arms
Replies: 10
by Hurricane Air Arms » Sat Apr 02, 2016 12:42 am

First post

Unlike our good friends across the Tasman and Pacific, Australians have basically struggled to create complex air guns simply due to a lacking of...

Last post

I can't help but disagree having first hand evidence and experience with them.

I'm not doubting your tubing, but readily available carbon fibre...

10 Replies

8914 Views

Last post by Hurricane Air Arms
Tue Apr 05, 2016 3:48 am
Calculate projectile data?

Last post by jimmy101
Replies: 5
by sharpshooter » Mon Mar 28, 2016 12:21 pm

First post

GGDT/HGDT have made the calculations up to the point of leaving the barrel a dream. But what about after? High school physics was a loooonggg time...

Last post

Jack covered it pretty well with the NASA link. In a nutshell any simple regular shape with constant density will be unstable. A sphere, cylinder,...

5 Replies

6061 Views

Last post by jimmy101
Sun Apr 03, 2016 10:25 am
Choosing Ammo / it's intention / my experience

Last post by Hurricane Air Arms

by Hurricane Air Arms » Thu Mar 31, 2016 11:56 pm

Hey guys

Having been around a few air gunners and forums the first of many questions asked is usually ammo, what type and how big. For this all you...

0 Replies

7402 Views

Last post by Hurricane Air Arms
Thu Mar 31, 2016 11:56 pm
Suitable valve for piston-hybrid?

Last post by Alex345
Replies: 4
by Alex345 » Fri Mar 04, 2016 4:08 pm

First post

Hey guys, i'm thinking of turning my pneumatic piston cannon into a piston-hybrid. Already got a shorter chamber, but i'd still like a second opinion...

Last post

I can't seem to install any of those programs... I've already started adapting the valve, I'll post an update soon.

4 Replies

5422 Views

Last post by Alex345
Sat Mar 12, 2016 7:54 am
Need CNC parts?

Last post by jrrdw
Replies: 1
by sharpshooter » Wed Mar 09, 2016 10:45 am

First post

Due to life being life, I have found myself with too much free time, and need to fill it with something productive. I want more practice in my new 3D...

Last post

Anything machining related should go here: :D

1 Replies

4224 Views

Last post by jrrdw
Wed Mar 09, 2016 1:24 pm
Fin stabilized and/or sub-caliber ammo?

Last post by Alex345
Replies: 8
by Alex345 » Thu Dec 10, 2015 12:35 pm

First post

I abandoned my last project because of a long planned vacation trip, but now that I'm back and fully recharged i feel like i just have to finish her!...

Last post

Well I've recently made one of these when i was bored.

round2.jpg
round1.jpg

It's sub-caliber, so i still need a way to shoot it out of my...

8 Replies

8867 Views

Last post by Alex345
Fri Feb 12, 2016 4:50 pm
sources for valves

Last post by iknowmy3tables
Replies: 7
by iknowmy3tables » Fri Jan 22, 2016 3:44 pm

First post

Hello spudfiles it's been a long time, I've become a working adult and I've been spending a lot of money and time on real guns, I haven't built a...

Last post

This isn't QEV related but I just learned something about a valve I bought for my project, I bought this 3 way control valve when it arrived it...

7 Replies

5969 Views

Last post by iknowmy3tables
Sun Jan 31, 2016 9:09 pm
Max pressure for 2" steel chamber and PSV valve?

Last post by Alex345
Replies: 2
by Alex345 » Thu Aug 13, 2015 7:43 pm

First post

So I've gotten my shiny new air chamber for the B*tch! I remember once seeing a chart from someone who had tested common sizes of galvanized steel...

Last post

That's why i wanted to ask you guy's first :)

This is sanitary (plumbing) pipe, i've seen that chart before but i've never heard of wrought steel...

2 Replies

4348 Views

Last post by Alex345
Fri Aug 14, 2015 3:16 pm
So i found this...

Last post by Alex345
Replies: 5
by Alex345 » Thu Aug 06, 2015 1:22 pm

First post

A friend of mine asked me to cut a .50 bmg bullet down the middle for some kind of artsy stuff he was doing. Bout halfway through cutting my blade...

Last post

Well, it's magnetic and it won't scratch glass so I'm guessing it's hardened steel :) But yeah you'd need a truly mighty cannon to really use...

5 Replies

6382 Views

Last post by Alex345
Fri Aug 07, 2015 1:38 pm
Paintball tank vs other air source

Last post by Solar
Replies: 7
by LivingSavage » Wed Jul 30, 2014 12:45 am

First post

Hello I'm new to the site so hopefully I'm in the right place. Im interested in building an air rifle in the .30-.50 cal range. I want to get a...

Last post

Ninja has a V2 valve with 30 percent more flow than the pin valve version.
it uses a ball bearing to accomplish this. The SLP V2 it set to 300psi...

7 Replies

8358 Views

Last post by Solar
Sat Jul 18, 2015 6:59 am
Discontinuous Rifling

Last post by Solar
Replies: 2
by auxiliary » Thu Jul 02, 2015 7:10 pm

First post

Hi spudders!

I've got a question for you! I've got my new airgun I built here: and I have a 10.5 .45 cal rifled barrel inside it. I want to get some...

Last post

Smooth bore first to allow the projectile to accelerate with less friction then engage the rifling. Otherwise the rifling effect will lose rotation...

2 Replies

5054 Views

Last post by Solar
Sat Jul 18, 2015 6:50 am
2.5" heavy round

Last post by stuffbuilder
Replies: 2
by stuffbuilder » Sun May 24, 2015 4:33 pm

First post

I just discovered the perfect ammo for a 2.5 sch 40 barrel: Redd's Wicked Apple cans. The fit is tight enough to not need wadding but not so tight...

Last post

Its a bit skinnier than a typical soda or beer can, although I guess beer comes in a wider variety of can sizes so its hard to say exactly. Either...

2 Replies

4327 Views

Last post by stuffbuilder
Fri May 29, 2015 3:06 am
Burst pressure in a filament/wire wound cylinder

Last post by mrfoo
Replies: 8
by Kilash » Sun May 17, 2015 12:39 am

First post

Attempting to determine an estimated burst pressure for a barrel that is made from an inner cylinder sleeve reinforced with thin fibre filament or...

Last post

Looking at the patents might be of use; it certainly seems that the idea should work.

For example, Graphite/metal matrix gun barrel , and the...

8 Replies

8223 Views

Last post by mrfoo
Mon May 18, 2015 11:43 am
Finding .177" pipe

Last post by vng21092
Replies: 18
by maverik94 » Wed Jun 03, 2009 1:49 pm
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Ok, I just found out I can buy 6000 .177 steel bbs at a local store for about $16 USD. I have plans for a single action rifle that shoots .177 bbs....

Last post

The hand in that photo is mine. And yes, I did and... it arrived? lol
18 Replies

24762 Views

Last post by vng21092
Sun May 17, 2015 1:21 pm

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