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TD 1 golf ball cannon(my first pneumatic)

Built a pneumatic 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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TD 1 golf ball cannon(my first pneumatic)

Unread postAuthor: smiley_666 » Sat May 02, 2009 1:43 am

well as the title suggests, this is my first pneumatic(edit: its actually my first spud gun). iv been lurking around here for a while and designed my cannon on the quick dump valve, from when the first thread was posted, before technician started posting
the fittings are all PN18 and the pipe is PN12 (approx. 174psi), both 40 and 50mm (im in Australia). the barrel (removable) and chamber are both 1m long (although the barrel has a fair bit of dead space)
the valve was fairly difficult, as i had to sand the T to fit the 50mm pipe the whole way through. it took a while but with a dremel i eventually got the pipe to fit.
the piston is made from a 6mm bolt and a nut, two circular cut-outs of 6mm ply, 2 large washers (ends of the piston), 6 washers for spacers between the ply and other washers, a bit of aluminium tubing and 6 orings. i used 6 orings, ranging from fairly small to the ones visible to help stop them slipping out as it goes past the valve opening.
my first shot with it was at 30psi, the golf ball flew out the barrel and hit a tree about 20m away, broke a branch and ricocheted over into the paddock, about 50-60m. :shock: :twisted: that surprised me as how well it actually shot.
2nd shot was at 30psi... and the golf ball flew!!! :shock: :twisted: :twisted: it went about as far as i can hit one with a club, and thats about 200m (ok, it probablyonly went about 100-130ish :roll: ).
i was only using this by pulling the piston out the back of the valve by hand, as i am having a few issues with the orings catching on the valve opening. eventually it will have a bumper and bolt to reload, and use a spring to pull the valve back, so it will have an actual trigger.i cant wait to finish the bumper and trigger so i can actually try this thing at higher pressures!!!

sorry if that was a bit long and ask away with any questions you have,

tom :D
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Attachments
P020509_14.56.JPG
piston
P040409_11.41[01].JPG
valve before the chamber was attached
P040409_11.41.JPG
valve open
P040409_11.40.JPG
valve closed (with a red bull can as the piston in this pic)
P040409_11.50.JPG
the cannon!
P040409_11.50.JPG (38.18 KiB) Viewed 490 times

smiley_666
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Unread postAuthor: SubsonicSpud » Sat May 02, 2009 3:08 am

Looks great for a first gun, Good Job. :D

May I suggest a support which connects the barrel and chamber at the end, so you don't break a Tee or Elbow joint.

Great to see another Aussie on the forum, Welcome :twisted:

Keep up the good work!


SubsonicSpud
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SubsonicSpud
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Unread postAuthor: smiley_666 » Sat May 02, 2009 3:10 am

thanks. i do have a barrel support but i just didnt have it on when i took the photos :)
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