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***Piston Breakage/Accident***

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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***Piston Breakage/Accident***

Unread postAuthor: mattyzip77 » Sun Aug 07, 2011 1:25 pm

I was shooting my golfball cannon yesterday and my piston broke. Luckilly I was holding it bazooka style, on my shoulder, because when I opened the pilot to shoot it, not only did the ball go flying, so did my qev and pilot setup. It went shooting backwards with mad force, at about 75 p s i. as you can see from the picture, the bushing broke into 3 pieces. Thank God noone was behind me or holding the cannon a different way. Always check your cannon before shooting and make sure its safe. This coulda happened to anyone!!
TRY THIS LINK http://imageshack.us/g/88/26249618288521734801605.jpg/
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Last edited by mattyzip77 on Fri Aug 26, 2011 12:57 pm, edited 3 times in total.
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Unread postAuthor: MRR » Sun Aug 07, 2011 1:39 pm

Could you please upload the picture on spudfiles?
Not everybody has a facebook account.
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Re: ***Piston Breakage/Accident***

Unread postAuthor: jackssmirkingrevenge » Sun Aug 07, 2011 1:42 pm

mattyzip77 wrote:This coulda happened to anyone!!


... who did not take the forces of a piston slamming back into the launcher into account.
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Unread postAuthor: saefroch » Sun Aug 07, 2011 2:03 pm

Content not found error on the url for the picture. use the [img] tags to surround a picture's url.
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Re: ***Piston Breakage/Accident***

Unread postAuthor: mattyzip77 » Sun Aug 07, 2011 2:10 pm

jackssmirkingrevenge wrote:
mattyzip77 wrote:This coulda happened to anyone!!


... who did not take the forces of a piston slamming back into the launcher into account.


It had a proper bumper, sponge and half a tennis ball!! Also was working fine the past 200 balls!!!!
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Unread postAuthor: Technician1002 » Sun Aug 07, 2011 3:34 pm

I had the same problem with my first QDV. I moved to ABS for the female adapter and increased the bumper thickness.
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Re: ***Piston Breakage/Accident***

Unread postAuthor: velocity3x » Sun Aug 07, 2011 3:35 pm

mattyzip77 wrote: It went shooting backwards with mad force, at about 75 p s i. as you can see from the picture, the bushing broke into 3 pieces.


IMO.... 75 psi isn't a lot of pressure, but it is enough to create forces high enough to eventually fracture plastic construction.


Also was working fine the past 200 balls!!!!


Looks like 201 was the magic number. Everything on this earth fails at some point. Durability of materials is also part of engineering most anything. Plastic can't be expected to have the long life or resilience of aluminum or steel. Glad no one was injured.
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Re: ***Piston Breakage/Accident***

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Unread postAuthor: Gun Freak » Sun Aug 07, 2011 3:37 pm

Velocity is right... I'm thinking my next will be metal. Looks like my construction isn't as strong as I thought.
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Unread postAuthor: mattyzip77 » Sun Aug 07, 2011 4:58 pm

Gun Freak wrote:Velocity is right... I'm thinking my next will be metal. Looks like my construction isn't as strong as I thought.


maybe someone should make me a new one, lol, hint hint!!
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Unread postAuthor: mattyzip77 » Sun Aug 07, 2011 7:00 pm

I just got finished rebuilding it. I was able to attach a new 2 inch slip to thread female bushing, there was just enough room. All I had was a angle grinder with a cutwheel to do the job. I took my time and it came out pretty damn close to perfect. The piston itself was bent too, so I made a new one of those as well. I ran a test with low air pressure, and it sealed and held air perfectly. I know your supposed to wait 24 hours, but I couldnt, I had to know if it worked, and it did!!!! I will post pics soon, gotta find camera!! Once again, I want to thank Gun Freak for his advise!!!! :D :D SUPERNA LIVES!!!

New Piston Here
http://imageshack.us/g/26/28731618306355380631605.jpg/
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Unread postAuthor: Gun Freak » Sun Aug 07, 2011 7:35 pm

SUPERNA LIVES!!!

YEHH! :lol:
New piston... you forgot the washer in front of the rubber washer. Get one as big as you can find that will fit in the seat. This is vital to keeping the piston from blowing out.
Also... gawwwd why did you pressure test it dude of course it will seal but you really need to wait the full 24 hours.
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Unread postAuthor: mattyzip77 » Sun Aug 07, 2011 8:07 pm

Gun Freak wrote:
SUPERNA LIVES!!!

YEHH! :lol:
New piston... you forgot the washer in front of the rubber washer. Get one as big as you can find that will fit in the seat. This is vital to keeping the piston from blowing out.
Also... gawwwd why did you pressure test it dude of course it will seal but you really need to wait the full 24 hours.

I didnt forget, I didnt think it was needed because I used a carriage bolt, blow out from where? The 2 inch steel washer behind the rubber washer seals it perfectly to the barrel port. However, if it makes you happy, I will add one! :D And dont worry, it was only low p s i, and was sitting in front of a fan for like 8 hours!! I thought it was pretty darn good for my first working piston!! 8) javascript:emoticon('8)')
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Unread postAuthor: Gun Freak » Sun Aug 07, 2011 8:24 pm

Nice QUADRUPLE post Mr Cool 8)
It is needed. You're gonna have to unthread everything to put it on but it is the only way your piston will work correctly.
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Unread postAuthor: MrCrowley » Sun Aug 07, 2011 11:02 pm

mattyzip77 wrote: it was only low p s i, and was sitting in front of a fan for like 8 hours!! I thought it was pretty darn good for my first working piston!! 8) javascript:emoticon('8)')

Don't be surprised if this piston housing also blows to bits. You could have got bubbles between the glued joints from when you pressurized it. Then again, the joint may be fine. Who knows.

Would I use it personally, no.

I realise this post will do little to change your mind but hopefully you'll refrain from ignoring instructions in the future. You're supposed to wait 24 hours for a reason.
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Unread postAuthor: Mr.Tallahassee » Sun Aug 07, 2011 11:17 pm

Nice Desktop background matty! I recognize that image. :lol: Definitely use the washer. It has nothing to do with sealing but it will keep your sealing face from getting blown out with the ammo you are shooting. I've had two do that now and have since added the extra washer.
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