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Bumper Piloting Issues

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: clemsonguy1125 » Mon May 10, 2010 8:05 pm

If it destroyed the racket ball it will definatly destroy the tennis ball,try a large spring, and Mark its about 2 inches opened, pilots large about, 3-4 inches without the bumper, It will dramatically decrease once I get my new bushing and add the bumper, it needed to be shortened because its flow was only an 1 inch flow space
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Last edited by clemsonguy1125 on Mon May 10, 2010 8:09 pm, edited 1 time in total.
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Unread postAuthor: Gun Freak » Mon May 10, 2010 8:08 pm

I don't think so, the raquet ball was old and crinkley and tennis balls are more squishy so I'll try one.
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Unread postAuthor: clemsonguy1125 » Mon May 10, 2010 8:10 pm

Well if it was old and rotten, try a bouncy ball, one of those that cost .75 cents from a machine
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Unread postAuthor: Gun Freak » Mon May 10, 2010 8:11 pm

Those are solid though, it would be a terrible bumper.
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Unread postAuthor: clemsonguy1125 » Mon May 10, 2010 8:12 pm

no, the ones im thinking of are softer
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Unread postAuthor: Gun Freak » Mon May 10, 2010 8:21 pm

oh... well tomorrow i'll try the tennis ball.
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Unread postAuthor: mark.f » Mon May 10, 2010 8:54 pm

Actually, Gun Freak, I've made a couple of valves last year which had a bumper that was simply 1/4" of flat silicone rubber (the red stuff used for plumbing). Of course, I've only used those valves a handful of times, so I have no guarantees as to the longevity of such a setup, so you use that idea at your own risk...
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Unread postAuthor: Gun Freak » Mon May 10, 2010 8:56 pm

I don't want to take any risks, I can't rebuild this valve. I'm using a massive bumper (lol) or not firing it.
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Unread postAuthor: Technician1002 » Mon May 10, 2010 9:27 pm

I've had very good luck with the inside of a Nerf Football. My 2 inch ABS test cannon is still using the original bumper. To reduce damage the piston stroke is long with a long bumper for safe deceleration of the piston. This foam has never had any problem being blown out the hole. The foam bumper has a hole through it (for the rope) about 1/2 inch in diameter. It is made in 2 sections glued to a washer in the middle to help keep it aligned.

You can see it on the end cap next to the golf ball. It gets regular use at 65-75 PSI. This is a 2 inch cannon. When the valve is closed, it sits about 1.5 inches from the bumber.
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Unread postAuthor: clemsonguy1125 » Tue May 11, 2010 2:39 pm

Id use foam but it keeps getting sucked into the pilot valve
Edit-I found a great bumper, I put foam on the back of the piston and a tennis ball on adapter
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Unread postAuthor: Gun Freak » Tue May 11, 2010 3:25 pm

Sweet, when I reassemble my gun today I'll try a tennis ball.
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Unread postAuthor: clemsonguy1125 » Tue May 11, 2010 3:31 pm

Id also ad a piece of foam to the back of your piston, It seems to help a lot
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Unread postAuthor: Technician1002 » Tue May 11, 2010 6:34 pm

I did not add foam to my piston. I works fine. If foam is getting blown out of the pilot valve, the air path is too obstructed. Make a hole in the center of the bumper for an airflow path for the pilot air to vent through. All my piston valve cannons have a hole through the bumper. I have no issues with them blowing out.
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Unread postAuthor: Gun Freak » Tue May 11, 2010 6:45 pm

clemsonguy1125 wrote:Id also ad a piece of foam to the back of your piston, It seems to help a lot


I was going to do that, but it would only add weight to the piston (not much though) and I already had enough foam. Maybe I'll try it next time it's getting serviced.
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Unread postAuthor: clemsonguy1125 » Tue May 11, 2010 8:07 pm

I used a pool noodle
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