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| Building a Modern Pneumatic Airgun |
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| Stot:
Take 2.... Welllll.... Ive made lots since last time I posted, mostly gun stuff for my Air Rifles, but my current project is worthy of a project log. I bought a book by H.M. Buckley called The Modern Pneumatic Airgun. Its a well written explanation on the theories behind operation, some nice machining tricks and full plans to design and build a PCP Air Rifle. You can get the book by emailing Howard directly. He also does a follow up book that concentrates on making an air rifle with the air tube in the stock rather than under the barrel, like a Gunpower rifle. I'm at the stage where I have accumulates most of the materials to make the rifles and spent maybe £60 to get enough material for 2 full rifles + some spare parts. The most expensive part is the barrel as this cant really be made at home. Its not impossible, but impractical. Luckilly I managed to pick up a 24" .22 barrel for just £20. Ill keep a log of what Im doing here.. Hopefully. :poke: |
| Stot:
Ok part 2... First thing to do was prepare the air tubes. You can make these any length you want within reason, but the longer they are, the more air stored, the more shots you get. With the UK limit of 12ft.lbf for an unlicenced airgun, these air tubes at 450mm long should get 70 shots or so in .22. I used aluminium for the air tube hence the thick wall. These will be holding 3000psi+ So basically the pics below show that I. * chucked up the tube * faced off the end * Measured the bore with some telescoping guages and a micrometer * bored out the tube slightly to the minor size for the thread I was cutting * cut the thread. I use an old 2 flute milling bit as a boring tool. They work really well for this. Repeat 3 more times and give a cursory polish. :thumbup: Cheers Stot |
| Brass_Machine:
Thanks Stot for reposting. Got a lot of guys interested in this one :) Eric |
| j45on:
Interesting stuff :thumbup: keep it coming Edit : will you be making a pump as well or do you decant from another bottle ? And how much is the book ? |
| Stot:
Hi Jason, I have an FX pump that will pump up to 250bar. I don't have a bottle, I'm too lazy to keep getting them filled. :coffee: The book was £30 + post, £13 air mail or £8 surface mail USA / rest of the world; £6.50 Europe and £4.50 UK. Its a big old book. Cheers Stot |
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