Building a Modern Pneumatic Airgun

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Stot:

--- Quote from: Jonny on December 01, 2010, 07:32:28 PM ---You need a miller saves all the faffing about.
In saying that first 7 was done with just a Myford ML7, took an eternity.

Front looks quite short but will be ok. Looks thin where machined out for mag ie flex. Decent barrel fit in to breach unlike what you are copying using grub screws to centre barrel.

--- End quote ---

Some lovely work there Jonny. I have a big old 7HP mill but its a 2 ton job that wont fit in the house I'm in at the moment. Moving next year so hopefully Ill look for someplace with a big garage that will let me use it. :thumbup:

I did have reservations about the barrel end of the breech but it will be supported up front with a barrel band, so it should be fine and will help minimise any flex imparted on the magazine slot. If I went free floating I would have made it a lot longer and id be more concerned about he slot. I've made it 5mm bigger than the design in the book anyway and added an extra grub screw.

Also added the extra mounting holes. In the book it only has 2 in the front and 2 at the back so I added another 2 at the back again to help minimise any flexing that may occur.

Cheers
Stot

Stot:

--- Quote from: Brass_Machine on December 01, 2010, 10:23:39 PM ---And doing a great job of it. Those look stellar.

Eric

--- End quote ---

Cheers Eric. :beer:
Stot

cfellows:
Maybe I missed this somewhere in your thread... what are the ID and OD of the aluminum air tubes used for reservoirs?

Thx...
Chuck

Stot:
The tube I'm using is 1 1/4" x 3/16" tube. Ill pressure test it before I use it properly but the way the o-rings work in the bore of the tube, it should be more than capable.

I've got the bits for pressure testing as Jonny described but I do need to make some adapters and stuff up. I worked out that using water and oil to pressure test you only increase the volume by ~ 5% to reach 600bar pressure so any failures this way should just result in a crack and pop rather than a full on explosion. :bugeye:

Cheers
Stot

cfellows:
I was just curious. I'm still noodling around with making a pump airgun. Haven't decided whether to use steel or aluminum. The pump and reservoir will all be part of the same tube.

Chuck

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