Search found 233 matches

by mrfoo
Fri Sep 16, 2022 12:27 pm
Forum: Pneumatic Cannons
Topic: Access Old Threads?
Replies: 5
Views: 232

Re: Access Old Threads?

jackssmirkingrevenge wrote:
Fri Sep 16, 2022 10:51 am
I don't suppose there's a way for PCGUY to automatically update all the broken links?
I've been through this before, and frankly, it's an awful lot of work and a proper pain in the rear to do correctly.
by mrfoo
Thu Sep 08, 2022 12:46 pm
Forum: Pneumatic Cannons
Topic: Access Old Threads?
Replies: 5
Views: 232

Re: Access Old Threads?

by mrfoo
Tue Sep 06, 2022 1:23 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Hammer & QEV Valve Questions
Replies: 5
Views: 373

Re: Hammer & QEV Valve Questions

With a standard hammer valve the hammer has to open *and hold open* the entire valve that's going to be used to flow the air you're using for propulsion. As pressure and bore size go up, you'll need more and more hammer force to open the valve. A QEV + hammer valve reduces the hammer force required ...
by mrfoo
Fri Aug 26, 2022 8:47 am
Forum: SpudFiles Discussion
Topic: Youtube Changes Coming July 23, 2021
Replies: 2
Views: 2953

Re: Youtube Changes Coming July 23, 2021

That's not entirely true, as I understand it Users with unverified accounts may only post videos less than 15 minutes long. Verified accounts can post videos up to 12 hours long. The cynic in me says it's nothing to do with reducing the amount of time people spend on the site, as that would be utter...
by mrfoo
Sun Aug 21, 2022 10:16 am
Forum: Pneumatic Cannons
Topic: 3D printed internal valve trial
Replies: 7
Views: 649

Re: 3D printed internal valve trial

Bearing in mind that I know bugger all about 3d printing apart from what Ive read on line, I think I'd probably be a bit worried about the housing splitting along the lines between layers. Otherwise, it looks proper good and very much the kind of thing I'd machine.
by mrfoo
Tue Jul 26, 2022 12:56 pm
Forum: Ammo & Parts
Topic: Great video testing spud gun failure/safety (ThebackyardScientist)
Replies: 4
Views: 2393

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 ...
by mrfoo
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: 1273

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...
by mrfoo
Tue May 10, 2022 5:45 am
Forum: Pneumatic Cannons
Topic: I need of dire help (Air Solenoids valves)
Replies: 2
Views: 1031

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...
by mrfoo
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: 1606

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...
by mrfoo
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: 1606

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...
by mrfoo
Sun Nov 28, 2021 8:33 am
Forum: Off-Topic Hobbies
Topic: OK, it's not a spud launcher
Replies: 1
Views: 1696

OK, it's not a spud launcher

But it's pretty damn next level.

by mrfoo
Fri Oct 01, 2021 9:55 am
Forum: BB, Airsoft, and Pellet Guns
Topic: What is 0000 buckshot used for?
Replies: 2
Views: 1540

Re: What is 0000 buckshot used for?

It's used for shooting big mother buckers.
by mrfoo
Sun Aug 29, 2021 5:05 am
Forum: Hybrid Cannons
Topic: Thoughts on my piston valve design
Replies: 41
Views: 17470

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.
by mrfoo
Mon Aug 16, 2021 5:45 am
Forum: Off-Topic Hobbies
Topic: I CAN HAZ MILING MACHIEN?
Replies: 4
Views: 3096

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...
by mrfoo
Sat Aug 14, 2021 1:06 am
Forum: Off-Topic Hobbies
Topic: I CAN HAZ MILING MACHIEN?
Replies: 4
Views: 3096

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...