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Mattys second piston

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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Mattys second piston

Unread postAuthor: mattyzip77 » Fri Aug 19, 2011 10:00 pm

This is my second, but really my first, seeings how Gunfreak made the last one. Anyways, nothing special, regular barrel sealer, 2 inch Tee, 1 1/2 inch porting,3/4 inch QEV pilot with a blowgun, and quick connect filling, piston is a 1 1/4 inch coupler plugged at both ends with a neoprene washer as the sealer connected by a carriage bolt going through the whole piston. Havnt made a chamber yet but it works with my old chamber which was just about 30 inches of 2 inch pvc sch 40, and a 36 inch sdr 21 1 1/2 inch golf ball barrel. I get 400 yards with ease at 80 p.s.i. Hanging out on the piston are my two pet bearded dragons, and no they are not ammo and no I dont fire at them. Here is the link, let me know what you think!!

http://imageshack.us/g/405/221wa.jpg/
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Unread postAuthor: Gun Freak » Fri Aug 19, 2011 10:04 pm

Good work!! Those lizards are bad ass too.
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Unread postAuthor: mattyzip77 » Fri Aug 19, 2011 10:07 pm

Gun Freak wrote:Good work!! Those lizards are bad ass too.


Thanks, I learned from a pro! :wink: And they are not lizards, they are bearded dragons!!
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Unread postAuthor: Gun Freak » Fri Aug 19, 2011 10:14 pm

Ehem, dragons breathe fire :tongue3:
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Unread postAuthor: Mr.Tallahassee » Fri Aug 19, 2011 10:33 pm

Gun Freak wrote:Ehem, dragons breathe fire :tongue3:
Shhh! Don't anger them! :angryfire:
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Unread postAuthor: jsefcik » Sat Aug 20, 2011 1:16 am

awesome, cant wait for mine, we should see who can shoot further

looks really simple to build!!!!
Once i get the one in the mail and the other i still have to order, i cant wait too see the performance!!!
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Unread postAuthor: jrrdw » Sat Aug 20, 2011 6:04 am

Matty, you need to start using Photobucket.com for showing your pictures. It's free as well and less pop ups. Yes I have pop up blocker but when you click on a picture to enlarge it Imageshack gives you 2 pop ups for looking at the enlarged picture.

Nice work on the piston valve. Them Dragons look like they need to go on a diet... :P
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Unread postAuthor: clemsonguy1125 » Sat Aug 20, 2011 11:05 am

Nice bearded dragons. What morph are they? BTW they are lizards, they are in the agamidae family. Nice cannon too.
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Last edited by clemsonguy1125 on Sat Aug 20, 2011 1:17 pm, edited 1 time in total.
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Unread postAuthor: jsefcik » Sat Aug 20, 2011 11:24 am

This thread was about matty second piston, not dragons or lizards or firebreathing ones, guys lets stay on topic!!!
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Unread postAuthor: Fnord » Sat Aug 20, 2011 11:24 am

Hey matty,

Your construction looks very good but be aware of that female adapter you used for the piston service area. I made a smaller piston valve not too long ago and split the adapter completely down its side when I screwed in the pilot assembly.

What that means is, there isn't much of a safety factor when you're actually shooting it; mine split while depressurized and it'll be stressed even more with 120 psi in it.

I later fixed it by peeling off the broken parts and adding several layers of fiberglass wrap around the new adapter, which has endured many shots now without issue.

look here...
http://www.spudfiles.com/forums/removin ... 22441.html


Oh, and matty, any type of other cool stuff you mention in you post tends to send us off-topic in a handbasket. This includes all species of lizardy things, especially the "door-opening" variety.
Edit... found it lol
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Last edited by Fnord on Sat Aug 20, 2011 11:46 am, edited 1 time in total.
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Unread postAuthor: Technician1002 » Sat Aug 20, 2011 11:43 am

I had one break when fired. An alternative to PVC is ABS. Use the proper glue to join it.
Image

I've had them hold up OK when nested inside another pipe to add a second layer.
Image
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Unread postAuthor: jsefcik » Sat Aug 20, 2011 11:47 am

Technician1002 wrote:I had one break when fired. An alternative to PVC is ABS. Use the proper glue to join it.
Image

I've had them hold up OK when nested inside another pipe to add a second layer.
Image


the picture to the far right, how did you get the pipe to fit over the fitting?

heat it?
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Unread postAuthor: mattyzip77 » Sat Aug 20, 2011 12:00 pm

jsefcik wrote:This thread was about matty second piston, not dragons or lizards or firebreathing ones, guys lets stay on topic!!!


Dont beeeatchhh about people posting in MY thread, I put the dragons in the topic as a size reference to the piston housing. People are free to ask if they choose to!!![/b]

@fnord
What that means is, there isn't much of a safety factor when you're actually shooting it; mine split while depressurized and it'll be stressed even more with 120 psi in it.

I also had the same thing happen to me before, I posted it in a earlier thread. I have a good bumper, so I am not too worried. Thank you for the advice and concern though!!
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Last edited by mattyzip77 on Sat Aug 20, 2011 12:04 pm, edited 1 time in total.
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Unread postAuthor: jsefcik » Sat Aug 20, 2011 12:04 pm

mattyzip77 wrote:
jsefcik wrote:This thread was about matty second piston, not dragons or lizards or firebreathing ones, guys lets stay on topic!!!


Dont beeeatchhh about people posting in MY thread, I put the dragons in the topic as a size reference to the piston housing. People are free to ask if they choose to!!![/b]


i was protecting you, so it doesnt get locked
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Unread postAuthor: Technician1002 » Sat Aug 20, 2011 12:07 pm

Look at the middle picture. I rounded the edge of the female adapter by sanding it. I heated the pipe until it softened. It will soften like a garden hose and become flexible. With the adaptor on end, I simply shoved the pipe onto the adapter just like installing a hose barb. I made sure it was straight and let it cool. Once cool, I pulled it out and added glue.
When it is soft like a garden hose it can be bent quite a bit. Care must be taken to prevent overheating it.
Image
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Last edited by Technician1002 on Sat Aug 20, 2011 12:08 pm, edited 1 time in total.
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