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1 Inch Steel Nipple 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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Unread postAuthor: Kobl » Sat Jul 12, 2008 3:52 pm

Okay, heres an assload of pictures so maybe you guys can help me out some more.

The main issue at the moment is that the piston will not actuate, it seals and fills fine (there are a few minor leaks) but when I pull the ball valve all the air comes out the ball valve.

The whole cannon

<a href="http://s184.photobucket.com/albums/x58/Kobl_mindguy/?action=view&current=IMG_1864.jpg" target="_blank"><img src="http://i184.photobucket.com/albums/x58/Kobl_mindguy/IMG_1864.jpg" border="0" alt="Photobucket"></a>

A video:

http://s184.photobucket.com/albums/x58/ ... I_1881.flv

The Pilot/fill Assembly

<a href="http://s184.photobucket.com/albums/x58/Kobl_mindguy/?action=view&current=IMG_1862.jpg" target="_blank"><img src="http://i184.photobucket.com/albums/x58/Kobl_mindguy/IMG_1862.jpg" border="0" alt="Photobucket"></a>

Some shots of the barrel goning into the tee:

<a href="http://s184.photobucket.com/albums/x58/Kobl_mindguy/?action=view&current=IMG_1865.jpg" target="_blank"><img src="http://i184.photobucket.com/albums/x58/Kobl_mindguy/IMG_1865.jpg" border="0" alt="Photobucket"></a>

<a href="http://s184.photobucket.com/albums/x58/Kobl_mindguy/?action=view&current=IMG_1866.jpg" target="_blank"><img src="http://i184.photobucket.com/albums/x58/Kobl_mindguy/IMG_1866.jpg" border="0" alt="Photobucket"></a>

<a href="http://s184.photobucket.com/albums/x58/Kobl_mindguy/?action=view&current=IMG_1868.jpg" target="_blank"><img src="http://i184.photobucket.com/albums/x58/Kobl_mindguy/IMG_1868.jpg" border="0" alt="Photobucket"></a>

The piston, That white junk is lithium grease

<a href="http://s184.photobucket.com/albums/x58/Kobl_mindguy/?action=view&current=IMG_1871.jpg" target="_blank"><img src="http://i184.photobucket.com/albums/x58/Kobl_mindguy/IMG_1871.jpg" border="0" alt="Photobucket"></a>

<a href="http://s184.photobucket.com/albums/x58/Kobl_mindguy/?action=view&current=IMG_1872.jpg" target="_blank"><img src="http://i184.photobucket.com/albums/x58/Kobl_mindguy/IMG_1872.jpg" border="0" alt="Photobucket"></a>

The Nipple which I dremeled out to be smooth:

<a href="http://s184.photobucket.com/albums/x58/Kobl_mindguy/?action=view&current=IMG_1873.jpg" target="_blank"><img src="http://i184.photobucket.com/albums/x58/Kobl_mindguy/IMG_1873.jpg" border="0" alt="Photobucket"></a>

<a href="http://s184.photobucket.com/albums/x58/Kobl_mindguy/?action=view&current=IMG_1874.jpg" target="_blank"><img src="http://i184.photobucket.com/albums/x58/Kobl_mindguy/IMG_1874.jpg" border="0" alt="Photobucket"></a>

Almost no space between the side of the piston and the side of the nipple

<a href="http://s184.photobucket.com/albums/x58/Kobl_mindguy/?action=view&current=IMG_1875.jpg" target="_blank"><img src="http://i184.photobucket.com/albums/x58/Kobl_mindguy/IMG_1875.jpg" border="0" alt="Photobucket"></a>

All of it together:

<a href="http://s184.photobucket.com/albums/x58/Kobl_mindguy/?action=view&current=IMG_1876.jpg" target="_blank"><img src="http://i184.photobucket.com/albums/x58/Kobl_mindguy/IMG_1876.jpg" border="0" alt="Photobucket"></a>
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Unread postAuthor: MrCrowley » Sat Jul 12, 2008 8:02 pm

The gap looks too big in some areas and too tight in others. Either tape your piston evenly or get rid of the tape. IMO, the piston is getting jammed in some areas and the air just goes through the gaps.
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Unread postAuthor: Kobl » Sat Jul 12, 2008 8:42 pm

I think I'm just gonna get a brass nipple and make a cast hot glue piston instead, it just worked wonder on an air soft gun I just made.

Thanks for the advice though!
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