Search found 215 matches
- Thu Apr 01, 2021 12:26 am
- Forum: Pneumatic Cannons
- Topic: Pressure rating for Coaxial cannons
- Replies: 12
- Views: 429
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: 337
- Tue Mar 16, 2021 1:12 pm
- Forum: BB, Airsoft, and Pellet Guns
- Topic: Spring powered Nerf blaster
- Replies: 9
- Views: 497
Re: Spring powered Nerf blaster
Outstanding!
- Tue Mar 02, 2021 12:30 pm
- Forum: BB, Airsoft, and Pellet Guns
- Topic: Spring powered Nerf pistol
- Replies: 7
- Views: 386
Re: Spring powered Nerf pistol
Back in the day, we used to do that to bike parts. "Drillium", it was called.
- Tue Mar 02, 2021 1:17 am
- Forum: Pneumatic Cannons
- Topic: Release a certain amount of air pressure from tank?
- Replies: 2
- Views: 156
Re: Release a certain amount of air pressure from tank?
What you're wanting to do, in order to get consistent shots, I think, is release a fixed amount of air at a fixed pressure. This is more complex, and yet more simple. Have one high pressure tank of large size. This feeds a small chamber, perhaps of variable size so you can tune it, via a regulator. ...
- Sat Feb 27, 2021 12:26 pm
- Forum: BB, Airsoft, and Pellet Guns
- Topic: co2 tank to fill with air
- Replies: 7
- Views: 399
Re: co2 tank to fill with air
the bottle is actualy steel That's a good sign. Steel is far more resilient than aluminium. so it is has a working pressure of 1800 psi- 124 bar.... No, it *had* a rated working pressure of 1800psi, for CO2 only, in March 2001 when it was last hydrotested. Not sure what the acceptable period betwee...
- Fri Feb 26, 2021 12:57 pm
- Forum: SpudFiles Discussion
- Topic: Which side do we like the User Information on?
- Replies: 4
- Views: 288
Re: Which side do we like the User Information on?
I guess the verdict's in ;) Yep. With over a hundred views, only 4 people expressed a definite opinion. 2 more (myself included) stated that they didn't care (an option, in fact, which should have been "I couldn't care less", another case of overpondian mutilation of the beloved mother tongue), and...
- Fri Feb 19, 2021 11:48 am
- Forum: BB, Airsoft, and Pellet Guns
- Topic: co2 tank to fill with air
- Replies: 7
- Views: 399
Re: co2 tank to fill with air
Avoid beating off in public. It'll get you on a list. Sorry, that was a cheap joke. An aluminium tank can only, AIUI, be rated up to 3000 psi. That's around 200 bar, and the absolute maximum safe rating, tank direct from the factory, you can possibly expect. However, liquid CO2 only requires a bit m...
- Fri Jan 29, 2021 12:21 pm
- Forum: Pneumatic Cannons
- Topic: Multi Shots out of 100psi Tank
- Replies: 12
- Views: 712
Re: Multi Shots out of 100psi Tank
Well that's bad advice. I let people know I was thinking of the children and I ended up on a shortlist.
- Wed Jan 13, 2021 6:37 am
- Forum: BB, Airsoft, and Pellet Guns
- Topic: 4,2 mm pipe for 4.5 ammo
- Replies: 15
- Views: 1289
Re: 4,2 mm pipe for 4.5 ammo
Hah, fuel filter.
Ironically, an off the shelf oil filter, intended to be used as such, might well do a better job. For example,
27dB is 512 times quieter.
Ironically, an off the shelf oil filter, intended to be used as such, might well do a better job. For example,
27dB is 512 times quieter.
- Thu Jan 07, 2021 3:58 pm
- Forum: BB, Airsoft, and Pellet Guns
- Topic: 4,2 mm pipe for 4.5 ammo
- Replies: 15
- Views: 1289
Re: 4,2 mm pipe for 4.5 ammo
No, I understood that, I was suggesting a possible other approach. Crimping should work, as you suggest, use a mandrel of the desired size inside to avoid going too small. You can put a significant amount of pressure on with a drill chuck, but if it doesn't work you might look into finding someone w...
- Thu Jan 07, 2021 1:00 pm
- Forum: BB, Airsoft, and Pellet Guns
- Topic: 4,2 mm pipe for 4.5 ammo
- Replies: 15
- Views: 1289
Re: 4,2 mm pipe for 4.5 ammo
Totally stupid idea, maybe, for use of bbs... What if you were to bend the barrel down slightly, right at the start by the breech? Would that perhaps force a consistent contact between bb and the top of the barrel, effectively guarantee a hopup effect even with the extra speed you're generating? A b...
- Thu Jan 07, 2021 3:57 am
- Forum: BB, Airsoft, and Pellet Guns
- Topic: 4,2 mm pipe for 4.5 ammo
- Replies: 15
- Views: 1289
Re: 4,2 mm pipe for 4.5 ammo
Rifling buttons are cheap on aliexpress. Just saying, like.farcticox1 wrote: ↑Wed Jan 06, 2021 5:19 pmI guess an old rifled barrel would be the answer, but I think that's kind of cheating :?
- Wed Jan 06, 2021 12:13 pm
- Forum: BB, Airsoft, and Pellet Guns
- Topic: 4,2 mm pipe for 4.5 ammo
- Replies: 15
- Views: 1289
Re: 4,2 mm pipe for 4.5 ammo
How about using a reamer? in brass you could probably ream from 4.2 to 4.5 without steps, or pick up an adjustable reamer and use that.
- Fri Jan 01, 2021 9:24 am
- Forum: General How-To & Discussion
- Topic: JSR's workshop chronicles
- Replies: 71
- Views: 15773
Re: JSR's workshop chronicles
Nice result!jackssmirkingrevenge wrote: ↑Fri Jan 01, 2021 6:25 amI have to say that after being the bane of my machining existence for many years cutting threads is a real pleasure now!