Search found 228 matches
- Tue Jul 26, 2022 12:56 pm
- Forum: Ammo & Parts
- Topic: Great video testing spud gun failure/safety (ThebackyardScientist)
- Replies: 4
- Views: 1515
Re: Great video testing spud gun failure/safety (ThebackyardScientist)
Not sure if there was air in the line behind the water, but an interesting result. Definitely, he was pressurising with gas. So there was all the stored pressure of the gas in the line to deal with. Best way to do it is with a grease gun, they go up to stupid pressures (I've done hydroforming with ...
- Wed May 25, 2022 1:37 pm
- Forum: BB, Airsoft, and Pellet Guns
- Topic: Steel galvanized pipes as pcp rifle air chamber
- Replies: 4
- Views: 904
Re: Steel galvanized pipes as pcp rifle air chamber
1500 psi is above the rated pressure for the pipe, which is closer to 750psi. Although it *probably* won't unexpectedly burst at that pressure, but you've blown away any safety margin you have, so any minor damage could be catastrophic. But rather than the pipe itself, I'd be very worried about thre...
- Tue May 10, 2022 5:45 am
- Forum: Pneumatic Cannons
- Topic: I need of dire help (Air Solenoids valves)
- Replies: 2
- Views: 721
Re: I need of dire help (Air Solenoids valves)
Can't help you with solenoids except to say that they're probably orders of magnitude too slow for what you want. I can't even necessarily help with the latter part, but I can give some gut feel. Would like to find out about some new stuff if I can, maybe something along the lines of how much PSI sh...
- Wed Apr 27, 2022 6:52 am
- Forum: BB, Airsoft, and Pellet Guns
- Topic: Convert a Gas refill cylinder to an air cylinder?
- Replies: 7
- Views: 1114
Re: Convert a Gas refill cylinder to an air cylinder?
What I meant was I'd drill a hole at the end of the gas canister and then epoxy on the Schrader valve in the end for it to accept air instead of gas. But your saying that it's impossible? Nothing's impossible. But at a guess, the walls of that canister are no thicker than 0.5 mm or so. That's super...
- Tue Apr 26, 2022 11:25 am
- Forum: BB, Airsoft, and Pellet Guns
- Topic: Convert a Gas refill cylinder to an air cylinder?
- Replies: 7
- Views: 1114
Re: Convert a Gas refill cylinder to an air cylinder?
At a guess, that can's gonna be super thin, which would make modding it pretty difficult. I'd be more tempted to look at a discarded 60l oxygen canister or maybe a fire extinguisher CO2 recharge canister. Rather than modifying a canister, try talking to a local machinist, see if they can make up a t...
- Sun Nov 28, 2021 8:33 am
- Forum: Off-Topic Hobbies
- Topic: OK, it's not a spud launcher
- Replies: 1
- Views: 1375
OK, it's not a spud launcher
But it's pretty damn next level.
- Fri Oct 01, 2021 9:55 am
- Forum: BB, Airsoft, and Pellet Guns
- Topic: What is 0000 buckshot used for?
- Replies: 2
- Views: 1232
Re: What is 0000 buckshot used for?
It's used for shooting big mother buckers.
- Sun Aug 29, 2021 5:05 am
- Forum: Hybrid Cannons
- Topic: Thoughts on my piston valve design
- Replies: 41
- Views: 15915
Re: Thoughts on my piston valve design
> Obviously the downside is the spring isn't variable so a different spring would be needed for a given mix.
A threaded boss at the rear can increase or reduce preload on the spring within a certain range, although this will also reduce spring travel.
A threaded boss at the rear can increase or reduce preload on the spring within a certain range, although this will also reduce spring travel.
- Mon Aug 16, 2021 5:45 am
- Forum: Off-Topic Hobbies
- Topic: I CAN HAZ MILING MACHIEN?
- Replies: 4
- Views: 2673
Re: I CAN HAZ MILING MACHIEN?
So, spent some time stripping down a bit. Managed to unblock the tooling and the Z axis, (hooray for hand winches), loking at the scraping marks on the slideways and gibs I thought to myself "that's been rescraped", but given the way the gibs fit, I'd be surprised if it's done many hours from new. D...
- Sat Aug 14, 2021 1:06 am
- Forum: Off-Topic Hobbies
- Topic: I CAN HAZ MILING MACHIEN?
- Replies: 4
- Views: 2673
I CAN HAZ MILING MACHIEN?
It's been a while that I've been looking for a smallish milling machine to go with my smallish lathe(s). Yes, I am aware that the chinese make some fairly capable small milling machines. But I simply don't like them. Horrible yucky plastic tat. Id far rather something made of great big chunks of cas...
- Thu Jun 17, 2021 5:40 am
- Forum: Combustion Cannons
- Topic: Trouble with oxy/acetylene mix
- Replies: 6
- Views: 2865
Re: Trouble with oxy/acetylene mix
No idea how to resolve the problem. Just posting to say "Whoah what the fuck you're clearly my kind of absolute fucking maniac" 🤘
- Tue May 25, 2021 12:06 am
- Forum: Off-Topic Hobbies
- Topic: Two Italian WW2 helmets found
- Replies: 5
- Views: 3197
Re: Two Italian WW2 helmets found
That's pretty cool.
- Thu Apr 22, 2021 2:15 pm
- Forum: Hybrid Cannons
- Topic: Xtreme-patator
- Replies: 11
- Views: 5112
Re: Xtreme-patator
Nice. Comme dit hector, le cuivre ne risque pas d'aimer cette utilisation. Tube acier sans soudure Ø20, ep2 te donnera Øint de 16mm, ce n'est pas trop cher - https://lamtechno.com/tube-acier-de-precision-e235n-rond-sans-soudure-cintrable/90-381-tube-acier-sans-soudure-cintrable-diametre-20.html#/23-...
- Thu Apr 01, 2021 12:26 am
- Forum: Pneumatic Cannons
- Topic: Pressure rating for Coaxial cannons
- Replies: 12
- Views: 5032
Re: Pressure rating for Coaxial cannons
Good question. The force being applied to the barrel will be compression, rather than tensile, and PVC (like many materials) is stronger in that respect. Tensile strength of rigid PVC, 34 … 62 MPa, Compressive strength 55 … 89. So in that respect, you're probably OK. However. These figures are signi...
- Sun Mar 28, 2021 6:23 am
- Forum: Hybrid Cannons
- Topic: Large hybrid
- Replies: 10
- Views: 5578