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A place to ask general spud cannon related questions.
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Unread postAuthor: SpudStuff » Tue Jul 11, 2006 6:14 pm

Here are my renderings
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Piston-Back.gif
Bach of the piston hollowed out and filled with foam to reduce volume behind piston and reduce piston mass
piston-fromt.gif
front of piston where washer is bolted on over neopreme
Plug-with-guide-rod.gif
The rear plug shown without screw holes
includes o-ring grooves
Plug-side.gif
side of the plug. notice stop
Plug-side.gif (14.86 KiB) Viewed 1133 times
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Unread postAuthor: boilingleadbath » Tue Jul 11, 2006 10:24 pm

spudstuff, it looks tapered to me. Perchance 1.59*?

As to being type 2:
It's the same tone of beige as mcmaster's type 2 stock.
Using type 2 for a piston makes sence. You want impact resistance, no?
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Unread postAuthor: CS » Tue Jul 11, 2006 11:46 pm

Mark, may god bless you with lots of goodies! Second of all I sprinkled some pimp dust on you... Thanks a billion.
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Unread postAuthor: SpudStuff » Wed Jul 12, 2006 12:13 am

good point i didn't thing of that
i think it may be tapered now that i take a closer look ar the photos
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Unread postAuthor: drac » Wed Jul 12, 2006 7:31 am

I do believe that this is how the piston seals. Please critique it.
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Unread postAuthor: mark.f » Wed Jul 12, 2006 7:35 am

I like the way he leaves the back plug removable for service. The O-ring seal/screws idea beats just solvent welding it in there anyday.

And yes, in their original e-mail context, the sender said that the piston seals against 2" SCH-40 pipe coming from the inlet. That oughtta help you in GGDT with those things, (2.067" porting).

EDIT: I still think you guys aren't considering what the inside of a NSF-pw rated tee is shaped like. The bottoming depth on each slip, (part the pipe or spigot fitting pushes into), is bored to 3.5" and then where it bottoms, the slip decreases in inside diameter so that the pipe or fitting will bottom.

The back plug and piston BOTH slide inside the part bored to 3.5" in the piston, and the piston is lathed down at the end so that it goes over the decrease in inside diamter to seal against the piece of 2" pipe. This would be kind of a key thing in designing your own piston, as that would set you back if you didn't account for it.

On another note, you could just bore the tee to 3.5" with a lathe or drill press, (with spade bit), so the piston would slide all the way, but there is no telling how that will effect pressure rating, which is why I don't think Joel did that...
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Unread postAuthor: spudshot » Wed Jul 12, 2006 8:59 am

all of the manufacturers use different molds for their fittings, i forget what manufacturer joel gets his tee's from, but i know its not one i've ever seen in any store, perhaps that brand of tee is molded differently, without the large stops inside?
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Unread postAuthor: WOW!! » Wed Jul 12, 2006 10:57 am

But if it seals aganist that bushing, how does it seal the barrel off??

EDIT-Unless the second half of the piston O ring doesnt leave the slip part.
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Unread postAuthor: SpudStuff » Wed Jul 12, 2006 12:16 pm

the lasco tees by my house have stops that are about 1/2 a mm tall. so the elevated oring would make the piston clear the stop
looking at the pictures of the mega launcher 2 you can tell the tees are lasco. thoes are the same ones around my house. thay have a micro stop
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Unread postAuthor: SpudStuff » Wed Jul 12, 2006 1:39 pm

the ring always is in the slip part
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Unread postAuthor: WOW!! » Wed Jul 12, 2006 1:52 pm

O snap cracker jack
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Unread postAuthor: SpudStuff » Wed Jul 12, 2006 2:09 pm

yes i am going to attempt to build one with a 3 inch plug lathed down as the pistin and a sanded down plug for the back
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Unread postAuthor: drac » Wed Jul 12, 2006 2:56 pm

WOW!! wrote:O snap cracker jack


Thanks for the useless reply... mind contributing anymore stupidity?
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Unread postAuthor: SpudStuff » Wed Jul 12, 2006 3:29 pm

lol
i just foung a local supplier of 1.5 inch sdr 21!!! 5$ for 20 feet. i just bought 100 feet. i may start selling it for $0.75 a foot
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Unread postAuthor: WOW!! » Thu Jul 13, 2006 7:35 pm

What I was refering to was that Spud stuff answered my question I was replying that he helped me figure it out. <("<)
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