How-To: Make a pneumatic cannon with a 2" piston valve.

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SpudFiles Forum Index » How-To Database (NOT FOR HELP-ME POSTS!) » How-To: Make a pneumatic cannon with a 2" piston valve.

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How-To: Make a pneumatic cannon with a 2" piston valve.

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MrCrowley

Posted: 04/14/2008 14:05 PM Post subject:

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Hmm weird, mine completely thread together. Confused

niglch

Posted: 04/14/2008 20:20 PM Post subject:

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MrCrowley wrote:

Hmm weird, mine completely thread together. Confused

I just bought some new parts to replace the ones I broke. The first is a 2" female adapter and the second is a 2" threaded plug. Both parts indicate that they are pressure rated & schedule-40 (NSF-PW). However, when I tighten them with my hands, the two parts only thread about halfway in before they lock up. Trying to force it in any more is what broke the last set of fittings I had. Is this ok or am I supposed to use some sort of lubricant when threading the parts together? I read online something about it being bad to over-torque PVC fittings so should I just leave it how it is?

Thanks.

fittings_1.jpg

Description:

The fittings only thread together this far before locking up . . . :(

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55.41 KB

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fittings_2.jpg

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Here are the two fittings separately.

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MrCrowley

Posted: 04/14/2008 22:28 PM Post subject:

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Yeah don't over-torque them.

The fittings I used were a female and male threaded adapter. They completely threaded together with ease.

clide

Posted: 04/15/2008 17:07 PM Post subject:

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Fittings in the US shouldn't thread all the way together. The only ones I have seen that do have gaskets on them and aren't very common or are DWV parts.

PVC manufacturers typically recommend one to two turns past hand tight, and that seems to work for me usually.

MrCrowley

Posted: 04/15/2008 22:43 PM Post subject:

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Yeah that's a good point Clide. I'm using metric fittings.

DaGrimRaper

Posted: 04/26/2008 21:39 PM Post subject:

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wow thnks dude.

tony48

Posted: 05/04/2008 15:11 PM Post subject:

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Where did you get your barrel? I'm looking for a golfball barrel and I think I might have to go to a plumbing store to get one.

ilovetoblowthingsup

Posted: 05/04/2008 15:26 PM Post subject:

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www.bcarms.com

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