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new mini

Built a miniature cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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new mini

Unread postAuthor: urgle the danish cow » Sun Jan 22, 2012 6:43 pm

i havent made a mini in a very long time and i want to get into pen guns so i thought id start with a prototype.

main tube 1/2 inch copper.
caliber 6mm
piston machined nylon
valve schrader
pressure 250psi

it works pretty well and sends bbs flying rather nicely. i used jsr's method of using a drill bit to keep the barrel centered while the epoxy cured. i hope to make a few brass pen guns with lighter machined nylon pistons
thanks
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Attachments
IMG_0451.JPG
gun with pump
IMG_0452.JPG
gun
IMG_0447.JPG
before epoxy and trigger mechanism
note that the little "tail" on the back of the piston was cut off and the back was hollowed out with a drill
IMG_0448.JPG
nail head for trigger
IMG_0449.JPG
with spring and in valve
IMG_0450.JPG
piston
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Unread postAuthor: Gun Freak » Sun Jan 22, 2012 7:02 pm

Made use of my trigger idea, I see ;)

Looks good for a concept, I'm sure you can do a lot better.
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 23, 2012 1:29 am

Not a bad effort, did you put any rubber seals on the piston or is it just nylon against metal?
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Unread postAuthor: pneumaticcannons » Mon Jan 23, 2012 8:04 am

Nice effort :) though it looks like you could trim that excess epoxy off and the copper itself is begging to be polished. Does the nylon seal leak at all?
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Unread postAuthor: urgle the danish cow » Mon Jan 23, 2012 5:46 pm

jackssmirkingrevenge wrote:Not a bad effort, did you put any rubber seals on the piston or is it just nylon against metal?


its just the nylon and is leak free as i smoothed out the back of the barrel for a perfect fit.
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Unread postAuthor: urgle the danish cow » Mon Jan 23, 2012 5:46 pm

pneumaticcannons wrote:Nice effort :) though it looks like you could trim that excess epoxy off and the copper itself is begging to be polished. Does the nylon seal leak at all?


yeah i would do that but its just a protoype for smaller penguns. btw what is the best way to polish the copper?
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Unread postAuthor: Gun Freak » Mon Jan 23, 2012 6:43 pm

You can use fine grit sandpaper...
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