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optimize my piston. (video)

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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optimize my piston. (video)

Unread postAuthor: SpudFarm » Mon Feb 18, 2008 9:35 pm

hey i starting get bored of shooting and no tweaking so i am going to post a bunch of pics and stuff like that to explain all detail of the valve.
so i was hoping someone could come up with something i can do to get it better and faster :- )

thanks for music rag xD

any questions and suggestions are well welcome

well hear we go;)



[youtube]http://www.youtube.com/watch?v=XZBX-UuCh_g[/youtube][youtube]http://www.youtube.com/watch?v=0J7PHA5WLfw[/youtube]
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Attachments
IMG_0367.JPG
the trigger and safety valve. (look at the video and you get a clue)
IMG_0370.JPG
the piston sitting like in a fully open cannon. (it moves little too long 1" back)
IMG_0373.JPG
i soldered a washer to the opening so the piston get pulled back. pretty hard to explain.
IMG_0374.JPG
piston from side the red thing is a piece of rubber hose and is a bumper.
IMG_0375.JPG
piston front
IMG_0376.JPG
the housing
IMG_0394.JPG
closed piston
IMG_0396.JPG
haha i love to work in hear warm all the time and all the tools needed;) my dad runs a snowmobile tuning company so i use all the tools i can get
Last edited by SpudFarm on Tue Feb 19, 2008 12:44 pm, edited 1 time in total.
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Unread postAuthor: Velocity » Mon Feb 18, 2008 10:07 pm

I just realized now that that is some big diameter copper tubing. Looks good...
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Unread postAuthor: Gippeto » Mon Feb 18, 2008 11:31 pm

You just have to love copper. Seems as though it works quite well.

You wrote that the piston moves 1 inch, you could shorten that. Popular opinion is that the piston should move 1/4 of barrel id.(some do like a little bit more than this)

I also did not see any type of seal on the pilot side of your piston.

Reducing piston travel and adding a seal will both go a long way toward reducing piloted volume. Piloted volume includes the air that leaks past your piston while it is in motion.

Some people just use an over-sized piloting valve to compensate for this added flow. Anything you do to reduce this volume (assuming you use the same pilot valve) is going to increase the pistons average acceleration and thus reduce opening time.
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Unread postAuthor: SpudFarm » Tue Feb 19, 2008 10:40 am

the "seal" on the pilot side is the washer(?) the bolt have a perfect fit in it. before there was like 5mm clearing on each side of it now it is probably 0.5 :- )

i was thinking of some really tight pull springs that gives the piston a boost backwards on trigging. or is it to fast for the springs i think so bechause pneumatic is the fastest way to open a valve :D
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Unread postAuthor: Gippeto » Tue Feb 19, 2008 7:48 pm

You mentioned that the washer was soldered in place, therefore I assumed it is steel and not forming an air tight seal.

If you have something that already works, to improve it you must look at the small things. :)

Yeah, I would leave the springs for someone that does not know better. :D
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