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Short question topic

A place to ask general spud cannon related questions.
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Re: Short question topic

Unread postAuthor: jackssmirkingrevenge » Sat May 20, 2017 6:12 am

Yes, I need the coupling to join a paintball tank to a schrader hose so I can use the tank as a remote air source.


In that case the answer is a resounding no.

Here's how I had done it:

Image

Basically an aluminum schrader cap on one side with a hole drilled through it and an o-ring inserted for sealing, and a 1/8" fitting on the other, inside a tube filled with marine epoxy.
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Re: Short question topic

Unread postAuthor: Xamllew » Sat May 20, 2017 10:53 pm

That looks nice, so it's just {schrader cap > epoxy and o-ring > 1/8" fitting} inside of the tube? What type of valve is that attached to the regulator? Thanks.
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Re: Short question topic

Unread postAuthor: jackssmirkingrevenge » Sun May 21, 2017 8:07 am

Here's how I made the fitting:

Image

What type of valve is that attached to the regulator?


The 1/8" NPT thread is then attached to an ASA on/off adapter so you can connect it to a tank:

Image
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Re: Short question topic

Unread postAuthor: Xamllew » Mon May 22, 2017 6:03 pm

Okay, here's what I got
Image
Co2 tire inflator threaded onto the sawed off neck of a threaded co2 cartridge > 1/8" brass coupling > to the paintball tank hose. Got the paintball regulator modded to a pressure of about 200 PSI which I can bump up or down by adding more belleville washers inside. Haven't tried it yet but I really hope it works because this co2 inflator is so fast and convenient to use.
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Re: Short question topic

Unread postAuthor: jackssmirkingrevenge » Mon May 22, 2017 9:15 pm

Looks good!
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Re: Short question topic

Unread postAuthor: Xamllew » Fri May 26, 2017 12:18 am

Update: Tried it out today, I think my Paintball ASA is missing an o-ring or something because when I go to thread the tank onto the ASA/hose assembly it just dumps air at an alarming rate before I can get the thing threaded on.

EDIT: nevermind, it's the regulator that's missing the o-ring, pretty sure that's the cause of the air dump.
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Re: Short question topic

Unread postAuthor: Cthulhu » Fri May 26, 2017 5:46 pm

I've got a quick question for the thread:
Are propelling potatoes with black powder still considered a Spud gun?
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Re: Short question topic

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Re: Short question topic

Unread postAuthor: WizardNoodle » Fri May 26, 2017 8:22 pm

BAD IDEA

First off, this violates section 3 of SpudFiles rules.

A simple 9mm's barrel pressure can reach 30,000 PSI. Most firearms reach a pressure of around 60,000 psi. (http://closefocusresearch.com/calculating-barrel-pressure-and-projectile-velocity-gun-systems & http://boards.straightdope.com/sdmb/showthread.php?t=647356

Still suicidally doubtful about how bad self-annihilation can be?
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Last edited by WizardNoodle on Mon May 29, 2017 9:07 pm, edited 1 time in total.
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Re: Short question topic

Unread postAuthor: Zeus » Fri May 26, 2017 9:00 pm

It is still a spud gun though technically

And a side note on accuracy, conventional black powder only reaches 20,000 or so, with such a low friction I'd honestly be surprised if it reaches anywhere near that.

But yes, it's against SF rules
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Re: Short question topic

Unread postAuthor: jrrdw » Sat May 27, 2017 6:55 am

Cthulhu wrote:I've got a quick question for the thread:
Are propelling potatoes with black powder still considered a Spud gun?


Yes, if you're launching spuds. It's a time bomb and you can't discus "solid propellants" on the Spudfiles forums.
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Re: Short question topic

Unread postAuthor: Cthulhu » Sun May 28, 2017 9:32 pm

Woops, should have read the rules.

Anyways, slightly borderline off limits, but could you ignite your gas propellant in a combustion Spud gun with a toy capgun cap?
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Re: Short question topic

Unread postAuthor: Zeus » Mon May 29, 2017 1:10 am

Likely not off limits as it's been attempted before.

The question I have is why? Electrical ignition is far simpler, requires no precise alignment of cartridges (I take it from your previous thread that it's an application) and electrical ignition usually seals quite well.

But yes, it'll work. If I were you I'd look into underhammer mechanisms, that would allow you to have no need for a hammer at the base of the cartridge, simplifying loading and unloading.
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Re: Short question topic

Unread postAuthor: Cthulhu » Mon May 29, 2017 10:49 am

Zeus wrote:
But yes, it'll work. If I were you I'd look into underhammer mechanisms, that would allow you to have no need for a hammer at the base of the cartridge, simplifying loading and unloading.


I can't seem to find an example of an underhammer other than actual firearms, could you explain it?
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Re: Short question topic

Unread postAuthor: D_Hall » Mon May 29, 2017 5:53 pm

WizardNoodle wrote:TERRIBLE IDEA. DO NOT ATTEMPT.


Meh... It's easy to do if you've got half a brain and an understanding of basic chemistry and physics. In fact, it's done every day using cardboard tubes (hint: fireworks). Beyond that, if anyone has questions I'll answer via email, but I'll respect the forum rules otherwise.
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Re: Short question topic

Unread postAuthor: Zeus » Mon May 29, 2017 6:13 pm

If you research underhammer rifles, you'll see a number of various caplock rifles, all with a suitable action for your uses. Weaponeer is a good starting place for gunsmithing forums. The actual mechanism is one of the simplest and easiest to get right. As the cap itself would be on the side of the chamber instead of the rear, there's no need to get the firing mechanism out of the way to reload.

A major thing (as addressed by Dave in your other thread) is that you will need to use propane or a similar fuel. If the cap gets wet at all, it will not fire. On the topic of fuelling, you could be really clever and inject the fuel through the cap nipple. You wouldn't need another port, which further simplifies the cartridge.

Dave, the real pros use ABS!
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