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Cracker/Bulberator Design

noshead said:
looking a few pages back i'm impressed with the engineering your skills Mr White, does the cracker a page back have a control of the flow of the gas?, or is it simply a flow thru design.
Click to expand...

Thanks, i'm actually doing engineering at uni =D
You can control the flow somewhat by screwing and unscrewing the cracker against the nail. All the way up and it comes out slowly as the nail blocks most of the hole in the bulb, screw it out to increase the flow.

You could always put a valve on the end to control it better but i was going for a reasonable compact cracker
 
drug_mentor said:
"You can fix the nail using 2 m-m connectors and a f-f connector, and a T piece instead of an elbow. If the nail has a large flat head, you can trap it between the 2 m-m inside the f-f. Wrap the nail head in plumbers tape too."
Ayjay, could you please elaborate on your method? Maybe I''m retarded but I just can't picture this, but, a glueless bulberator is starting to sound promising since this fuckin glue wont hold.
Click to expand...

Will try (edit - can't get formating right - looks good on edit page but spacing all wrong in my diagram below) :

| | =m-m connector (thread on outside)
| | = f-f connector (thread on inside)

You can sandwich a nail head between 2 m-m connectors, threaded in from opposite sides of a f-f connector (the head on the nail has to be big enough to not be able to pass through a m-m):
| |
| - |
| ||
|
|

Then you screw the bottom m-m, with nail protruding, into a T-piece; and then carry on as previous design - the "elbow" is now 2 parts of the T, with the nail and connector bizzo screwed in to the 3rd arm of the T.

Clear as, hey!!​
 
ayjay, you can always use a drawing prog, or sketch and scan, then upload from your HD using 'additional options'. keep in mind file size is restricted to 97kb
 
Kandeman said:
such a pity that the picture in this thread don't exist anymore

http://www.bluelight.ru/vb/showthread.php?t=54033

twas a two cracker bulberator with a weather balloon that held 100+ bulbs *sigh*
Click to expand...

there may still be some pics from where the wild things are in 2001? you should have seen the mess those guys made that night, it was like a machine gunners nest after a war with all the empty cartridges around ;)
 
So I have ended up using the original design but modified it so instead of a nail I have used a self tapping screw. This is the best working idea I have done so far. I plan to put epoxy in the thread of the screw so it will absolutely never unscrew, then file the excess screw on the top away and wrap in electrical tape.

I do however have a few questions. How long should it take a cartridge to empty its contents fully and how inflated should the balloon be after one cartridge? I keep finding that the cartridge, although it has stopped dispensing gas in the bulberator, when I take it out has a few last sprays of gas what causes this last bit of gas to not come out in the bulberator?

Also, last night I attempted to load 2 cartridges into the one balloon, I loaded the first, pinched gas in the balloon then loaded a second. This was going fine and the balloon inflated to twice the size. But I waited too long as I still heard a small amount of gas escaping and sort of left it, spacing out not really watching the balloon just listening for the hiss to stop. Well, I look down at the balloon and its gone down to the size it was after the first cartridge. What has happened here? I have also found when pinching a balloon with gas in it to wait for a mate to load theirs and take them together, gas seems to escape even though you can't hear or feel it. What am I doing wrong? I am using 30cm helium quality balloons if that matters.

Cheers for helping out guys. I know I'm fucking hopeless at this but I am deterined! I swear after a week waiting to go to my mums to discretely use her electric drill only to find out it didnt work I worked the drill bit through the thing with my fingers pushing down on the top with one thumb and rolling the bit with my other thumb and forefinger, let me tell you it took bloody hours and it fucking hurt! That is how badly I wanna get stuck in this nang loop and all the other awesome shit you guys do so please help yeah?
 
madmick19 said:
it was like a machine gunners nest after a war with all the empty cartridges around ;)
Click to expand...

OH MY GOD, youve given me a fantastic/horrible/awesome idea!
An automatic bulberator.
Dump bulbs into the loading tube, have some mechanism to crack then eject them, have the nitrous go into one (or more) weather balloons, and have multiple dispensing hoses.

What a monstrosity that would be =D


d_m, was it easy to get the screw to tap and stay centred? And hand drilling? Now thats commitment =D

The couple of sprays happens to me too, I think some ice must form over the hole or someting. I've solved it by untwisting it slightly and shaking the cracker a few times, you'll hear the sprays release into the balloon.

There are three possible sources for the leak.
1. The thread tape on the screw-in part might be wearing away (i assume you have thread tape on this part), just reapply and you'll be good to go.
2. Your not pinching the balloon tightly enough, i usually twist the balloon and then pinch that, just to be sure.
3. There could be a small gap where the screw is.

I'd recommend cracking a bulb under water and looking for bubbles to diagnose the problem
 
The "last sprays" problem is I believe due to N2O flowing back around the bulb and getting trapped. That's why giving the bulbicaterer a shake helps get this free. If you take a good clean pull (not that I would advocate this because of course using a balloon is safer), inhaling the gas as fast as it is being released, you don't tend to get much stuck in the machine. Also the inexperienced user who lets the N2O out too fast, to the hilarity of all watching, as their cheeks blow out and gas pisses everywhere, is liable to end up with more "last sprays"..

Incidentally - anyone ever know anyone to have a vagus nerve spasm from inhaling directly from the bulbationeriser? I know that's why the balloon method is recommended - but just how much of a risk is it?
 
Mr. White said:
d_m, was it easy to get the screw to tap and stay centred? And hand drilling? Now thats commitment =D

The couple of sprays happens to me too, I think some ice must form over the hole or someting. I've solved it by untwisting it slightly and shaking the cracker a few times, you'll hear the sprays release into the balloon.

There are three possible sources for the leak.
1. The thread tape on the screw-in part might be wearing away (i assume you have thread tape on this part), just reapply and you'll be good to go.
2. Your not pinching the balloon tightly enough, i usually twist the balloon and then pinch that, just to be sure.
3. There could be a small gap where the screw is.

I'd recommend cracking a bulb under water and looking for bubbles to diagnose the problem
Click to expand...

I ended up putting the head of the screw in a vice with the point protruding upwards shoving the elbow on it at the hole and twisting the elbow. It is *slightly* off centre, more so the further it is screwed in but it still is very close to centre and pierces the soft metal circle on the top of the bulb, I got it on the first try aswell, considering everything else I fucked up its comparitively not too hard lol.

I actually didn't apply as much thread tape as I would of liked after seeing later in the thread u meant to wrap 10-15 times. that said I cant unscrew the bloody cap lmao. I'm not clear on what you mean twist the balloon? With the screw only once did I see gas escape from the screw and I'm not eve sure if that was a hallucination lol, I'm gonna glue the thread anyway.

Cracking a bulb under water is a magnificent idea man I would never have thought of that in a million years. But I sppose thats why you're the guy with the awesome instructional thread and I'm the guy struggling to follow it hey?

Anyway, hopefully I'll get some more "experimentation" done this weekend! cheers!
 
Oh god. I haven't done these in ages....

We built an octa-machine one afternoon but we never got around to sealing it properly.

Working with the ordering for large kitchens gave me access to crates of bulbs.

So much wasted time.

phase_dancer said:
It sure beats taking the rubbish out the day after a big party. When N2O was a popular favourite round these parts, it was not uncommon to next day find the wheelie bin filled to the brim with empty bulbs. It's not only heavy to push, but the sound of it emptying is something else again 8(
Click to expand...

I know this sound well... I gave up after hitting the 200+ mark in one day
 
Impressive pdf!
Did you have the blocks for all those parts? how about the cross section view, did you have the blocks already for them?


to the people that don't use a baloon, can you please at least attach at foot or so of tubing to allow the gas to cool?

also, instead of making this, you can just purchase a "nitrous cracker". think they're designed for C02 bike pump things though, but there's a lot out there sold as nitrous ones...
 
blocks? i drew it all out line by line in AutoCAD, taking measurements of the peices as i went. Everything in the second pdf is 2:1 scale.
 
Mr TIMO said:
to the people that don't use a baloon, can you please at least attach at foot or so of tubing to allow the gas to cool?
Click to expand...

You mean "allow the gas to warm" - the energy required to turn liquid N2O into gaseous N2O ("latent heat of vapourisation") is drawn from the environment, superchilling it. There is a technical risk of cold gas spasming the nerve in the throat (vagus nerve) which controls breathing. This could be life threatening.

BUT - as I posted before - I've never heard of anyone actually having a vagus nerve spasm; is it really that much of a risk? Serious question - what's the percentage?
 
Why doesn't everyone just buy a cream gun? Mine holds 6 bulbs and its nice not haveing to try and reload while your out of it
 
My favourite thing about crackers (as opposed to whipped cream dispensers) is that they are so much more compact and in turn concealable.
If you see someone nanging out in the middle of 2manydjs next monday, it might just be me =D
 
I recently saw a rather interesting setup which used a tank of instrument grade N2O, with 4 nozzles made from plastic hose (dripper type ag pipe) and a balloon connected in parallel to act as a buffer (and a spare for a 5th person).

The advantage with instrument grade was said to be not only purity (it's used to calibrate sensors) but also how dry the gas is. By the time it reaches the users on the end of the tubes, the gas is only slightly cool, and relatively dry, meaning there's less risk of lungs freezing. The downfall was the cost of such high grade N2O, nearly double that of auto grade.
 
I know this is probably going to sound incompetent, but could someone please explain to me how this thing works? Or link me to somewhere that can tell me, if this question has been previously asked..

I've never used Nitrous but am sure keen to give it a try.
 
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