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Vex robotic cannon

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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Vex robotic cannon

Unread postAuthor: metalmeltr » Wed Dec 22, 2010 10:58 am

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Unread postAuthor: Hotwired » Wed Dec 22, 2010 11:07 am

Automated refilling but no mag also you can rotate the turret and elevate the barrel but you can't aim in any meaningful sense.

I'm sure we've all imagined making something along those lines :)
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Unread postAuthor: ramses » Wed Dec 22, 2010 12:40 pm

Hotwired wrote:I'm sure we've all imagined making something along those lines :)


Yes, we have
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POLAND_SPUD wrote:even if there was no link I'd know it's a bot because of female name :D
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Unread postAuthor: Technician1002 » Wed Dec 22, 2010 1:14 pm

The VEX launcher is very inefficient with the air supply as there is a small diameter hose to feed the air into the barrel. Adding a chamber to the moving barrel with a larger orifice and short path would vastly improve output power with no change in input air consumption, or it would consume much less air per shot for the same launch velocity.

It is a cute robot, but not an efficient launcher design.
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Unread postAuthor: metalmeltr » Wed Dec 22, 2010 2:58 pm

I was drooling over the robotic mechanics, I agree that it is not an efficient launcher.
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Unread postAuthor: Moonbogg » Wed Dec 22, 2010 8:03 pm

Nice. The builder doesn't seem as paranoid about his welded aluminum as I am about mine :lol:
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Unread postAuthor: metalmeltr » Thu Dec 23, 2010 12:39 am

TIG weld will hold no problem
any good weld should be stronger than the substrate
in addition he is working with much lower pressures if your talking about your hybrid.

I have added some pictures of weld failure and a glue used in automotive assembly that was part of my recent school science project.
Pictures coming soon
begining to dislike SF uploader
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Attachments
spotwelds.JPG
weakest
standard method of assembling cars
plugwelds.JPG
replacement for spotwelds in colision repair
fusor b109.JPG
rust patches
used in similar forms for bonding some panel by OEMs
bead weld.JPG
strongest
some joints in manufacture and collision repair

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Unread postAuthor: jackssmirkingrevenge » Thu Dec 23, 2010 8:37 am

Shame about the poorly designed cannon, it could be made into a much more efficient and powerful multishot with relative ease.
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Unread postAuthor: Technician1002 » Thu Dec 23, 2010 9:41 am

The issue as shown above in the photos is either the weld is weakened or the metal adjacent to the weld is weakened. Note the bead weld broke at the weld, not somewhere else. The failure at the welds is common. This is why high pressure tanks are never welded. Only low pressure tanks such as Propane tanks are welded.

Oxygen, Argon, and CO2 and SCUBA tanks are one piece construction. They do not have welded fittings.
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Unread postAuthor: metalmeltr » Thu Dec 23, 2010 9:45 am

The bead weld failed in the HAZ of the weld, the weld itself did not fail, there is a small amount of the base material from the failed piece still in the right side of the weld bead.
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