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2.5" Threaded Plug

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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Unread postAuthor: hi » Sat May 12, 2007 7:57 pm

ya, i think it is 1/4 OD. the funny thing is that it fits into a 1/8 npt thread, so maybe it is 1/8''
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: Intel Xeon » Sat May 12, 2007 8:02 pm

Well, npt threads are rather strange. 1/4" npt requires a 1/2" drill bit
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Unread postAuthor: jssizzle » Sun May 13, 2007 7:54 am

OK . . . so after all that confusion . . .

lets say I want to get from a piece of 1" sch 40 pvc down to a paintball barrel. So far I've found a 1" coupler, and a 1" to 3/4" reducing bushing. So 3/4" sch. 40 will fit in the bushing.

Will 3/4" sch. 40 PVC fit paintball?
or
What else can I use and how can I get there from a piece on 1" pipe?
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Unread postAuthor: noname » Sun May 13, 2007 10:06 am

3/4" Sch 40 will work fine, but for better accuracy you can use 3/4" Sch 80.
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Unread postAuthor: iPaintball » Sun May 13, 2007 10:28 am

SCH 80 has the same OD of SCH 40
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Unread postAuthor: hi » Sun May 13, 2007 10:30 am

yes, but the ID is smaller, therefore, it fits paintballs much better.
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you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: iPaintball » Sun May 13, 2007 10:37 am

No, I was just saying that it would fit in regular sch 40 fittings. I prolly should've said something about the ID, but I was just too lazy to do so...
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Unread postAuthor: jssizzle » Sun May 13, 2007 11:06 am

Ok thanks again for all the help.
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Unread postAuthor: clide » Sun May 13, 2007 5:28 pm

I would recommend a 3/4" CTS CPVC barrel. It's a perfect fit for paint balls and usually easy to find. To adapt it to the gun i would get a 1" coupler and a 1" spigot x 3/4" Female threaded bushing and a 3/4" CPVC male threaded adapter for the CPVC.
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Unread postAuthor: jssizzle » Sun May 13, 2007 5:58 pm

I can't get to the hardware store and mine's pretty crappy too, so I was looking on mcmaster for the CTS CPVC.

I found "CPVC Tube", and the 3/4" has an ID of .695". Is this the stuff you were talking about, just under a diff. name?
(Its on page 185 at the bottom)

EDIT:
"Sized the same as wrot copper tubing and fittings,"

Nevermind.
I hate being reminded how helpful it is to read the print before asking questions.
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Unread postAuthor: jssizzle » Mon May 14, 2007 5:22 pm

Yes this is a double post, but I answered my last question myself.

So for my piston the rubber I had been using was from a drum mute. It wasn't very good quality, and I have been looking on Mcmaster for a new piece. So many choices! I think I want just the standard neoprene, a 4" sheet, but I don't know how thick it should be.

Help?
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Unread postAuthor: frankrede » Mon May 14, 2007 5:52 pm

I would say 1/16 of an inch would be good.
Or 1/8" at the most
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Unread postAuthor: jssizzle » Mon May 14, 2007 6:06 pm

Ok then . . . in 3 days my cannon will be complete!
Then I have an exam and two projects due.
Hmmm.
Maybe 2 weeks.
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