Search found 1576 matches

by iknowmy3tables
Thu Sep 16, 2021 6:47 am
Forum: Pneumatic Cannons
Topic: A tale of two valves
Replies: 4
Views: 773

Re: A tale of two valves

Lol, I see what you're saying a lot more energy in the larger one used inefficiently. I'll make a video next time I visit my friend. Not a strictly controlled test but the large cannon was filled to something like 80psi the small cannon filled to a fraction of that shooting the same tennis ball we s...
by iknowmy3tables
Sun Sep 12, 2021 8:11 am
Forum: Pneumatic Cannons
Topic: Gluing schrader valve in mini coaxial
Replies: 3
Views: 873

Re: Gluing schrader valve in mini coaxial

I used to use a belt sander to remove rubber from Schrader valve stems. I last did it to glue and clamp it to some vinyl tubing

They do make threaded all brass valve stems that might work better with mini coax guns.
by iknowmy3tables
Thu Sep 09, 2021 3:17 pm
Forum: Ammo & Parts
Topic: barrel thoughts
Replies: 7
Views: 1134

Re: barrel thoughts

Question on barrel rifling expense, is a rifling button with budget? For .22 there are plenty of carbide rifling buttons for sale on ebay around $50. I haven't used one myself but from what I've seen if you rifle quality steel with a cheap rifling button you'll want drill rod and a press to force it...
by iknowmy3tables
Thu Sep 09, 2021 8:41 am
Forum: Pneumatic Cannons
Topic: Paintball Artillery Gun
Replies: 11
Views: 1805

Re: Paintball Artillery Gun

Glad you got a garage to keep it in, thermal cycling of the seasons wrecked a some of the more complicated PVC cannons I stored in sheds
by iknowmy3tables
Thu Sep 09, 2021 8:03 am
Forum: Pneumatic Cannons
Topic: A tale of two valves
Replies: 4
Views: 773

A tale of two valves

I'll cut to the chase, if you or a friend still use sprinkler valves show them this, I'll try to get a video to prove it if necessary. I built these two cannons with a friend who wanted to make an air Cannon. The small one was made for ping pong balls but my friend really wanted to try shooting tenn...
by iknowmy3tables
Wed Sep 19, 2018 5:53 am
Forum: Pneumatic Cannons
Topic: Starting a new build
Replies: 19
Views: 3250

Re: Starting a new build

should be okay, you still wanna make sure your ammo is ahead of the valve outlet while keeping the dead space to a minimum. a lot of designs like the coaxial gun in the website banner used built in ram rods to push ammo into the correct side pipe fittings A lot of other breech designs incorporated t...
by iknowmy3tables
Mon Sep 17, 2018 10:28 am
Forum: Pneumatic Cannons
Topic: coupler burst disk M72 law
Replies: 4
Views: 1076

Re: coupler burst disk M72 law

Yeah I shrunk the burst disk size to in theory increase rupture pressure and have less burst disk material overall all to hopefully make this more reliable. this method for burst disks is pretty limited and can only handle 3 layers of foil at most, also with friction alone holding the pipe I thought...
by iknowmy3tables
Sun Sep 16, 2018 10:02 pm
Forum: SpudFiles Discussion
Topic: Forum layout and "wasted" screen space
Replies: 9
Views: 3544

Re: Forum layout and "wasted" screen space

I think it's more that the text in posts would be harder to read in a wide format, if I wrote several paragraphs with use of the full screen and same text size as you pan you view back over to start the next line you loose track of which line you were on. I just wish the boxes on the left were more ...
by iknowmy3tables
Sun Sep 16, 2018 3:01 pm
Forum: Pneumatic Cannons
Topic: coupler burst disk M72 law
Replies: 4
Views: 1076

Re: coupler burst disk M72 law

I finally got a chance to update this project, i changed it to a 1.5" chamber with a .5" coupler and pipe for the burst disk, this seems to preform fine even just with one layer of foil. https://i.imgur.com/v4iU1Ao.jpg https://i.imgur.com/U1IDKu6.jpg https://i.imgur.com/lQQg3Jw.jpg https://i.imgur.c...
by iknowmy3tables
Wed Sep 12, 2018 7:49 pm
Forum: Pneumatic Cannons
Topic: Pneumatic RC Plane Launcher
Replies: 10
Views: 1641

Re: Pneumatic RC Plane Launcher

that "piston setup" seem like a better idea than stuffing it in the barrel, the extra weight of the piston would stabilize the acceleration. not to mention you'd still have a decent spudgun when you're finished
by iknowmy3tables
Wed Sep 12, 2018 4:38 am
Forum: Miniature Guns
Topic: New pengun
Replies: 53
Views: 18840

Re: New pengun

You're not the only one
by iknowmy3tables
Sun Sep 09, 2018 10:24 pm
Forum: Combustion Cannons
Topic: Rifle to combustion double camera, caliber 4.75 mm
Replies: 2
Views: 1570

Re: Rifle to combustion double camera, caliber 4.75 mm

nice build, what do you mean by a "double combustion chamber system"
by iknowmy3tables
Sun Sep 09, 2018 10:28 am
Forum: Ammo & Parts
Topic: 2" Hunter Sprinkler Valve for Sale
Replies: 2
Views: 1502

Re: 2" Hunter Sprinkler Valve for Sale

Couldn't pm for some reason but I'll offer $30 plus whatever the shipping estimate is
by iknowmy3tables
Sat Sep 08, 2018 12:43 pm
Forum: Pneumatic Cannons
Topic: Party Popper dissection (disposable pneumatic)
Replies: 1
Views: 711

Party Popper dissection (disposable pneumatic)

hello folks I recently bought some disposable confetti cannons to see if they could be used to launch nerf footballs in airsoft mil sim events. you can see a video of my test here [youtube]https://youtu.be/8vgTugv6Stk[/youtube] https://i.imgur.com/wyQI9mj.jpg it seems to work pretty well, but I deci...
by iknowmy3tables
Sat Sep 01, 2018 9:06 am
Forum: Pneumatic Cannons
Topic: Pilot Valve for QEV - JSR's $20 Semi-Auto BB Gun Question
Replies: 4
Views: 1711

Re: Pilot Valve for QEV - JSR's $20 Semi-Auto BB Gun Questio

If I'm not mistaken a lot of 3 way control valves are already internally pneumatically actuated. Mostly the ones with very easy to actuate switches or solenoids, if you buy one with 1/4" or larger ports you probably have a perfectly adequate opening speed for a small airsoft or Nerf gun build. I bou...