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propertys of hot glue

A place to ask general spud cannon related questions.
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Unread postAuthor: spudy buddy » Fri Jan 04, 2008 9:55 pm

YA I know that's a crazy limit when most people use 100 psi but at around 20-30 psi it put a marble through atleast 500 pages of a phone book and that freacked my parents out and so that's how the limmit was set. it was that or the trash for the gun so i really had no choice. oh and also my dad thinks it'll blow-up in my( face since the stock is part of the chamber) if i go any higher than 50 and it is my first time working with primer and cement so my parents will freak if i go over 50. lol

ok i'll use hand cream but how thick dose it have to be? the hot glue i meen not the cream?
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Unread postAuthor: Novacastrian » Fri Jan 04, 2008 10:03 pm

Are you using a hot glue gun? If so let it warm up alot, you want the hot glue as thin as water (well nearly). It wouldn't hurt to have the pipe warmed up slightly too.
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Unread postAuthor: spudy buddy » Fri Jan 04, 2008 10:11 pm

ok but when i cast it how thick does it need to be arownd the pipe?(sry i didn't explane that very well) oh and i have a really crap glue gun so when it warms up glue starts leaking out lol. anyway to fix it?

Edit: What other ways are ther to warm up the glue. I'm interested cause my glue gun is crap. lol :D
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Unread postAuthor: DYI » Fri Jan 04, 2008 10:19 pm

Well, if I was one of your parents, I wouldn't want you using over 50 psi in PVC pipe. It isn't rated for compressed gas use, and has potentially fatal failure characteristics when used with gases.

As far as melting down large quantities of hot glue, I don't know exactly what the best way is, but I can tell you from my own personal experience, DO NOT USE A TORCH!

I tried it once. It was the first time I've ever seen aluminum catch fire...
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Unread postAuthor: spudy buddy » Fri Jan 04, 2008 10:25 pm

lol it actualy caught fire???? :shock: :o :shock: :o now thats something that you gota see to believe.lol
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Unread postAuthor: DYI » Fri Jan 04, 2008 10:39 pm

It was aluminum foil, so it burned more easily. Later on that year in tech class, I witnessed the much more spectacular (and horrendously dangerous) phenomenom of 1/4" aluminum plate burning when some idiot was trying to cut it using an oxy/fuel torch cranked up to about twice the recommended pressure. It started boiling and spurting out huge globs of molten/gaseous aluminum, which hit surrounding walls and caught fire.

In the first incident, the hot glue actually ignited, which produced impressive heat as well as 1' high+ flames, which likely combined with and excess of oxygen from the torch to ignite the foil. The lesson: hot melt glue is a lot more flammable than paraffin wax (hybrid rocket fuel?).
In other random pyro related stuff, I got a piece of wood to burn so hot that it could melt copper pipe completely in <10 seconds. Pure oxygen FTW!
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Unread postAuthor: spudy buddy » Fri Jan 04, 2008 10:51 pm

OMG :shock: :shock: that right there would scare the :Beep: out of me. molten aluminum flying arownd????did this idiot get like severly hurt or did the building catch on fire?

wow i sure would like a furnace to melt stuff and cast amo for my launcher. i envy you. did you do anything with that copper or was it nolonger usable?
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Unread postAuthor: DYI » Sat Jan 05, 2008 6:29 pm

I don't have a furnace, as of yet. The "torch" was created by drilling a hole lengthwise through a piece of wooden dowel rod, and threading a hose into one end which I could run the oxy through. Then I simply lit one end of the dowel, turned the oxy to about 60 psi, and let it flow. I can't make a furnace until I get a larger oxidiser source.

The idiot has had several similar near death experiences, and has survived all of them in reasonably good health. Actually, a lot of stuff like that happens in my tech class. The teacher sees a guy come within 1" of having his face removed with a 30 pound sledge, and keeps on walking. He did tell us to put on some safety glasses when he saw the molten metal flying though... :lol: The whole shop is steel and poured concrete, so there weren't any worries there.
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Unread postAuthor: Fnord » Sat Jan 05, 2008 7:09 pm

Bah... You aren't a metal-worker until you've gotten hit by a couple globs of molten aluminum. It doesn't hurt as much as steel by the way.
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You CAN melt hot glue with a torch, but you have to do it very, very carefully. Heating it slowly in a thick pot of some kind will work, but I'd just use a hotglue gun for all but huge stuff.
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Unread postAuthor: DYI » Sat Jan 05, 2008 7:25 pm

Well, I don't think you've been hit by globs this big. I'm not talking spatter, I'm talking like 2+ cubic inches in one ball. Molten steel certainly would be worse though. Someone in our tech class charred the tips of his fingers when he tried to pick up a chunk of steel that was glowing orange :sign3:
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Unread postAuthor: ALIHISGREAT » Sat Jan 05, 2008 7:43 pm

DYI wrote:Well, I don't think you've been hit by globs this big. I'm not talking spatter, I'm talking like 2+ cubic inches in one ball. Molten steel certainly would be worse though. Someone in our tech class charred the tips of his fingers when he tried to pick up a chunk of steel that was glowing orange :sign3:


why would he do such a thing? its one of those wtf?!? things i guess that he just did... i burnt myself on some steel we had been welding in DT but that wasn't glowing orange 8)
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Unread postAuthor: spudy buddy » Sat Jan 05, 2008 8:33 pm

i burnt myself on a piece of semi molten glass. lol. it hurt and i did it cause after about 15 seconds after it was white hot it goes back to looking normal so i had no idea it was hot. it was still soft too cause it left an impresion of my fingers on it.

btw does anyone think i need to go thicker than the space between a 1 inch plug(not cap) and a 1/2 inch pipe? what i meen is take the pipe and put it in the plug right so there is still room to pour in the glue but will it be enough space or will the glue not get to the bottom befor it solidifies?
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