Search found 462 matches

by Hawkeye
Wed Feb 08, 2012 9:43 pm
Forum: Pneumatic Cannons
Topic: Does a longer barrel add distance ?
Replies: 12
Views: 1402

Still a balance between the increased time the ammo is pushed by the air versus overcoming the frictio of the barrel.
by Hawkeye
Mon Jan 30, 2012 11:16 pm
Forum: Pneumatic Cannons
Topic: HPA pump help.
Replies: 22
Views: 2919

Actually a homemade check valve with minimal inlet would be a better choice than a commercial one. The input from a handpump is pretty minimal so it only needs enough room for the air to "hiss" past the seal. Even if it locked open or failed completely it shouldn't allow enough air back out to form ...
by Hawkeye
Mon Jan 30, 2012 6:26 pm
Forum: Pneumatic Cannons
Topic: HPA pump help.
Replies: 22
Views: 2919

With a 3/4 inch copper pump I can reach 300 psi by basically using the pump like a shock pump. A 1/2 inch copper pump will be perfect for a hand held high pressure launcher. With a little creativity the pump could be incorporated like a pump action in the forestock where the pump handle sleeves arou...
by Hawkeye
Mon Jan 30, 2012 12:22 pm
Forum: Pneumatic Cannons
Topic: HPA pump help.
Replies: 22
Views: 2919

Use a floating o-ring on the piston head. Of course the configuration shown will work as long as you actually have the parts to make it as shown. I see a lot of vague diagrams that show parts sleeved neatly together with no signs of threads etc. There are usually practical limits to getting the fini...
by Hawkeye
Sat Jan 28, 2012 10:38 am
Forum: General How-To & Discussion
Topic: Leaking Quick Disconnects
Replies: 20
Views: 1221

Chances are the male is the problem. Did you drop it and perhaps chip or damage the part that seals against the o-ring?
by Hawkeye
Fri Jan 27, 2012 10:04 pm
Forum: General How-To & Discussion
Topic: Leaking Quick Disconnects
Replies: 20
Views: 1221

Yep, Use thread on fittings. :lol:
by Hawkeye
Fri Jan 27, 2012 7:59 pm
Forum: Pneumatic Cannons
Topic: building my first pneumatic with hammervalve full metal
Replies: 29
Views: 4302

I just meant that the upper part of the stock doesn't really look very face friendly.
by Hawkeye
Fri Jan 27, 2012 7:02 pm
Forum: Pneumatic Cannons
Topic: building my first pneumatic with hammervalve full metal
Replies: 29
Views: 4302

I'm trying to picture how this thing is going to be held...
by Hawkeye
Fri Jan 27, 2012 12:14 am
Forum: Pneumatic Cannons
Topic: building my first pneumatic with hammervalve full metal
Replies: 29
Views: 4302

Only needed for a forward travelling hammer? Like in the Airforce Condor? lol Neither of the diagrams look like they have enough hammer travel but the secondary lever at least gives the possibility. With the short travel and single trigger you're going to need a heavier spring which will make it har...
by Hawkeye
Thu Jan 26, 2012 9:11 pm
Forum: Pneumatic Cannons
Topic: building my first pneumatic with hammervalve full metal
Replies: 29
Views: 4302

The idea is to have the trigger in an ergonomic position. You could move it forward but then you're reaching up the forestock to trigger it.
The secondary sear lever is pretty common I think.
by Hawkeye
Thu Jan 26, 2012 7:54 pm
Forum: Pneumatic Cannons
Topic: building my first pneumatic with hammervalve full metal
Replies: 29
Views: 4302

The secondary lever is necessary to allow the hammer to travel further and get a better swing at the valve pin.
by Hawkeye
Sun Jan 22, 2012 8:00 pm
Forum: Pneumatic Cannons
Topic: Hammer valve endeavour
Replies: 148
Views: 10414

A short drill bit extender makes a good inline hammer. I have found that it's a slide fit in the smaller diameter copper.
by Hawkeye
Sat Jan 21, 2012 8:25 pm
Forum: SpudFiles Discussion
Topic: The Pneumatic Takeover
Replies: 93
Views: 7044

It's probably the air is free factor for pneumatics. The world we live in today probably scares people away from messing with anything explosive especially when the legality of it is dubious in many locations. Driving around with an empty propane cylinder can carry something like a half million fine...
by Hawkeye
Sat Jan 14, 2012 10:39 am
Forum: BB, Airsoft, and Pellet Guns
Topic: Spring Piston Air Rifles?
Replies: 12
Views: 10844

I have an old "Guns Annual" or something like that that shows a diagram of the Bate airgun.
by Hawkeye
Thu Jan 12, 2012 12:38 pm
Forum: Pneumatic Cannons
Topic: Hammer valve endeavour
Replies: 148
Views: 10414

I'm not sure how complicated this has to be. You just need a solid cylinder of metal that's a slide fit in your metal tube that will house it. Not that hard to find. A brass nipple can house the striker and you can use an end cap with a hole drilled in it so that the striker can be pulled back by ha...