I'm helping my little bro build a CO2 powered spud gun for his A level Physics coursework.

Any suggestions where I can get a 1/4" BSP tap to cut a thread in the barrel so I can plumb in the CO2 lines?

Also, I haven't quite figured out how to fasten airlines to my pub CO2 bottle so any suggestions there will also be helpful.

P.S. I'm fitting a 10 bar safety valve to the system so he doesn't blow himself up

pretty much any tool shop!

a good bet is always cromwell tools,

www.cromwell.co.uk

when I connected my co2 bottle up to my welder, I used a pub pressure regulator, screwed a hydraulic fitting into the reg, drilled the hydraulic adaptor, then soldered a piece of 1/4" copper hydraulic tubing into it.

Ok, I must be thick, but what's a spud gun and how do I make one ?

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Originally posted by JonBowden
Ok, I must be thick, but what's a spud gun and how do I make one ?

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I'll look in the garage tonight - you can borrow it for as long as you need if I have one.

http://rswww.com/
Very good for pneumatic fittings. Use the push-in type with plastic pipe.

Ok, I get the idea now - I think I'll need one for next summer

Thanks for the offer on the tap but I managed with out.

http://klug.co.uk/videos/MVI_6892_vert_trim.avi