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close nipple piston housing??

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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close nipple piston housing??

Unread postAuthor: mopherman » Wed May 23, 2007 6:19 pm

do you think a 1-inch close nipple would be big eneugh for piston housing?
If not, would like 1.5 inches work?
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Re: close nipple piston housing??

Unread postAuthor: Velocity » Wed May 23, 2007 6:49 pm

mopherman wrote:do you think a 1-inch close nipple would be big eneugh for piston housing?
If not, would like 1.5 inches work?


Certainly. If I were you, I would get a hex nipple, preferably made of brass for their smooth interiors. It costs $10 off of mcmaster though, so you might have to find something else...
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Unread postAuthor: mopherman » Wed May 23, 2007 6:52 pm

as an altearnative to the hex nipple , do you think i could just use my dremle tool to smooth the inside of the pipe?
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Unread postAuthor: Velocity » Wed May 23, 2007 7:25 pm

It would not work as well, but it certainly would work fine. I just like the polished finish on the inside of brass nipples; seems perfect for a piston housing.
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Unread postAuthor: spudthug » Wed May 23, 2007 7:59 pm

i just used a 1 inch by 3 inch nipple on my newest piston gun (shotgun) and i used an iron nipple that was bored out...its smoother than the brass ones i found at my local hardware store... although i did mine with a lathe and a bunch of special polishing tools at my dads shop...
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: mopherman » Wed May 23, 2007 8:17 pm

Thug, do you think a dremmle with a sanding wheel and a polishing attachment could work?
EDIT: rmich, do you ever go to hardware stores, or just mcmaster? It seems like it would cost a lot in shipping
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Unread postAuthor: GinsuGuy585 » Wed May 23, 2007 9:38 pm

Yes a dremmel with a sanding drum would work.

McMaster ships from Buffalo NY (one of their distribution plants is there) and I'm like a 1hr drive away. So while it still costs a bit for shipping, stuff arrives almost next day.
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Unread postAuthor: Velocity » Wed May 23, 2007 9:40 pm

Like GinsuGuy, my mcmaster carr is very close; an hour away. Everything comes next day, and the shipping is usually $6.

However, I do still go to hardware stores. I have found that the supplies at the hardware stores is not as high of a quality as at mcmaster. Furthermore, they do not have as good of a selection. I get things like copper and such from hardware stores still, but I like to get everything else from mcmaster. Its all pressure rated, I can get tons of things, and it comes immediately.
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Unread postAuthor: mark.f » Thu May 24, 2007 7:43 am

If nothing else, you may want to give copper a try. Maybe you could just build the valve out of copper, and the rest out of whatever you want to?

Or, you might just grind out the weld seam on the inside of the pipe. After that, the inside would be pretty smooth, and roughly cylindrical, for your O-ring seal or whatever, (I use duct-tape a lot :P ).
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