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i am so stupid

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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i am so stupid

Unread postAuthor: veginator » Sun May 13, 2007 9:57 am

just yesterday iwas testing out my knew cannon and not just once but twice the fittings blew apart. i later discovered that the fittings were not pushed in all the way. i have now fixed the problem and the gun should be ok
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Unread postAuthor: mega_swordman » Sun May 13, 2007 10:38 am

Umm, shouldn't the part be glued together! having the pieces together via a dry fit is only going to injure you in the long run. Stop it.
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Unread postAuthor: demilus » Sun May 13, 2007 10:49 am

You should probably stay away from sharp objects. By the way, the stove is hot, don't touch it. :lol:
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Unread postAuthor: veginator » Sun May 13, 2007 11:17 am

i did glue it but the glue dried before i could get the fitting on all the way.
even if i did dry fit it, it wouldn't be able to stay on if you hit above 20psi
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Unread postAuthor: Bubba05 » Sun May 13, 2007 11:34 am

Dont lick the eliments in the freezer dude. Thats bad!!
get your self a rubber mallet so when your putting these things together ok you lightly tap them untill they come together flush ok tap lightly!!

Bubba
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Unread postAuthor: jrrdw » Sun May 13, 2007 12:58 pm

I've found if you don't use enough primer and cement, they are hard to get together. I'de rather wipe off extra then not get enough.
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Unread postAuthor: super spuder » Sun May 13, 2007 1:02 pm

my one cannon got made at me and shot a T and two elbows at me :lol: the glue did not dry very good because it was a little cold
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trying to decide on a new project, probably something small.
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Unread postAuthor: jrrdw » Sun May 13, 2007 1:08 pm

super spuder wrote:my one cannon got made at me and shot a T and two elbows at me :lol: the glue did not dry very good because it was a little cold

The colder the tempature, the longer the cure time. Didn't you take the Ipex online training course? Or did you fail the test??? (jking)
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Unread postAuthor: super spuder » Sun May 13, 2007 1:19 pm

i was not really thinking that well that day :lol: all i read was let dry for 24 hours, did not read the part that says at 15 degrees celsius
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Unread postAuthor: SpudBlaster15 » Sun May 13, 2007 2:53 pm

If the pipe does not bottom into the fitting, set the assembly down and stand on it. If this doesn't bottom the joint, you didn't use enough cement, or it is no longer fluid.
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Unread postAuthor: Flying_Salt » Sun May 13, 2007 3:03 pm

You know, I hate to break it to you, but the position of the Resident Stupid Person has already been taken by me.
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Unread postAuthor: ammosmoke » Sun May 13, 2007 4:21 pm

LOL what did you do to get that?
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Unread postAuthor: Kenny_McCormic » Sun May 13, 2007 4:21 pm

yeah if its not going in all the way ur not using enuf glue when i solvent weld i use alot of glue and the fittings slide together with minimal effort
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Unread postAuthor: Pete Zaria » Sun May 13, 2007 4:27 pm

Kenny_McCormic wrote:yeah if its not going in all the way ur not using enuf glue when i solvent weld i use alot of glue and the fittings slide together with minimal effort


I agree. Use the primer and glue liberally. Just a little bit of glue should overflow from the top of the joint. If none comes out, you didn't use enough glue; if a lot comes out, you used too much.
Also, I like to twist the fitting into the socket as I push it in, and don't stop until it's bottomed out. Using a rubber mallet (or if you don't have one, use a block of wood [to protect the fitting] and a hammer) is perfectly acceptable. I've also found that PVC/ABS solvents don't work very well below about 50F.

To answer your question, I've never had a pipe/fitting blow up unintentionally. I've over-pressurized pipe to test its burst pressure / failure characteristics though. ABS rips nice and clean with little or no shrapnel ;-) PVC doesn't :(

Peace,
Pete Zaria.
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Unread postAuthor: jimmy101 » Mon May 14, 2007 9:20 am

I think it is alway a good idea to make a mark on the pipe that shows the depth of the fitting before applying the primer and glue.

Since primer will remove most inks, I usually mark the depth of the fitting on the piece of pipe using tape.

The tape will not only tell you when the pipe is fully seated but it will also tell you how far it seated if the joint siezes before you get it all the way together.
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