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Piston Block Broke My Pipe!

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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Have you ever fixed yours with a coupler?

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Piston Block Broke My Pipe!

Unread postAuthor: jrrdw » Fri Oct 20, 2006 4:59 pm

Just like it says. I have 3, 1 1/2" X 10/32 screws holding my piston stop, (made of wood), my piston, (also wood) has hit it hard enough to hammer it back breaking the pipe it's screwed to, (5 shots). The pipe cracked long ways. I think i all ready came up with a quick fix, (long lasting i hope). I'm going to cut the pipe in half at the screws and glue it back together with a coupler, then rescrew the stop block in place.
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Unread postAuthor: joannaardway » Sat Oct 21, 2006 1:20 pm

I've never had this problem. A spring or rubber bumper in the system saves situations like this.
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Unread postAuthor: SpudStuff » Sat Oct 21, 2006 2:50 pm

I have heard of people breaking cleanouts. You should order a SCH 80 plug from McMaster.com that should solve your problem. I also fould that small 1/4" long pieces of air hose work great as a bumper.
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Unread postAuthor: Velocity » Sat Oct 21, 2006 3:36 pm

You said you used three screws? That is definitely not enough. Look at the supah valve, considered by many to be one of the best valves out there. The piston stop has 27 screws on it.

The more screws you have, the less chance it has of breaking, for the force is being distributed more evenly.

I'd use 10+ at least
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Unread postAuthor: POS » Sat Oct 21, 2006 4:13 pm

I had the same problem, but I calculated a safty in the gun. The block was not the end of the pipe. The pipe was made a bit longer, the block is zitting in the middel. I filled the pipe up with a metal thin pipe (5 mm) tapen al around so it fits in the bigger pipe, due to reduce the pilot volume.

I used a spring as a block, the spring was smashed into the copper block, and I mean IN, not inside. The block got destroyed, the spring also, and the piston dammaged. At 130 psi.
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Pic Links To Cheqck Out

Unread postAuthor: jrrdw » Sat Oct 21, 2006 5:39 pm

The strongest shot was about 40psi according to the gauge, i cut it in half this morning, and fished out all of the busted piston block pieces. After pondering the damage i relized that the block didn't fit snuggly inside the pipe. Allowing it to get hammered sideways and that is how the pipe got cracked. I allready had a spring in it, but it's not very strong. Now that i can access the back of the piston, i'm gonna get a longer stronger spring for the piston. It's a world of difference when venting the pilot chamber with the modded sprinkler valve! As for the screws, i did away with them by glueing in some left over pvc pipe for a piston block, i didn't think about useing a rubber bumper along with the stop. I wish i would have! You see, i didn't do my homework and now i pay the price!!

Let this be a lesson to all the noobs, do your homework!

broke piston stop

patched with coupler
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