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A Sneak Peak.

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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A Sneak Peak.

Unread postAuthor: Mpeddlesden » Thu Sep 30, 2010 11:39 pm

This is the piston For my New gun (which is not finished yet) so i thought i would put a couple of images up.





<a href="http://s878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/?action=view&current=2010-10-01141344.jpg" target="_blank"><img src="http://i878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/2010-10-01141344.jpg" border="0" alt="4"></a>


<a href="http://s878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/?action=view&current=2010-10-01141324.jpg" target="_blank"><img src="http://i878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/2010-10-01141324.jpg" border="0" alt="3"></a>


<a href="http://s878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/?action=view&current=2010-10-01141218.jpg" target="_blank"><img src="http://i878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/2010-10-01141218.jpg" border="0" alt="2"></a>


<a href="http://s878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/?action=view&current=2010-10-01140959.jpg" target="_blank"><img src="http://i878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/2010-10-01140959.jpg" border="0" alt="1"></a>
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Unread postAuthor: chinnerz » Thu Sep 30, 2010 11:43 pm

Any chance of some information about how you made it, what its made of, etc?
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Unread postAuthor: Technician1002 » Thu Sep 30, 2010 11:53 pm

Reinforced rubber seal, nice touch.

From the photos it is difficult to see what the piston itself is made from as it is hidden in tape.

Due to the size, 0.61 inches it should be a good small stuff.

Somewhere in my older tools, I have a mechanical caliper with vernier scale too. I wonder how many SF members know how to properly read one. I prefer my digital.
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Last edited by Technician1002 on Fri Oct 01, 2010 12:00 am, edited 1 time in total.
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Unread postAuthor: MrCrowley » Fri Oct 01, 2010 12:00 am

I'd epoxy the gasket to the piston if I were you, it might fly off. Looks good though, crude but it should work.


Edit: Tech edited his post before I got around to posting mine :wink:
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Unread postAuthor: Technician1002 » Fri Oct 01, 2010 12:04 am

You caught that before I corrected it.. :D On closer exam, I found the top scale is inches. The bottom scale vernier scale is clipped in the photo and I assumed inches, but then spotted the scale on the top. If you read the vernier scale, it is 16.06mm in diameter.
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Last edited by Technician1002 on Fri Oct 01, 2010 12:09 am, edited 1 time in total.
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Unread postAuthor: chinnerz » Fri Oct 01, 2010 12:09 am

MrCrowley wrote:I'd epoxy the gasket to the piston if I were you, it might fly off. Looks good though, crude but it should work.


he isnt joking about that, has happened to me after i araldite'd the rubber to my piston.

few nails fixed that :)
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Unread postAuthor: D_Hall » Fri Oct 01, 2010 12:31 am

OMG. Actual vernier calipers. I haven't seen those used in probably 25 years. Cool retro!

(sorry, just geeking out a bit)
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Unread postAuthor: Technician1002 » Fri Oct 01, 2010 12:35 am

I bought mine while in high school to use with a gas engine repair class. I could not afford a micrometer at the time. I graduated in the mid 1970's so mine has been around for a while. It is a backup for when the digital has a dead battery. I'll post a photo of mine. Back in a sec.

Edit, grabbed the photos. Mine is old enough to only have fractional inches. The two scales are 1/16ths and 1/32nds of an inch. No metric, no decimal inches. It's my retro tool. The top scale just has an index mark. The bottom scale has the vernier scale.
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Caliper1.JPG
35 year old calipers.
Caliper2.JPG
The two scales are both inches
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Unread postAuthor: Mpeddlesden » Fri Oct 01, 2010 1:22 am

This Piston it's self is made from a door stop the length of it was twice as long but i cut it in half and pop-riveted the piece of rubber onto it.

The tape was just to make the fit just that more snug. I have used this piston in blank and none black firing dozens of times and its not yet had to be fixed lubricated. re-rubbered or re-taped.
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