Search found 3581 matches

by mark.f
Sat Jun 12, 2021 2:51 pm
Forum: Pneumatic Cannons
Topic: Paintball Artillery Gun
Replies: 3
Views: 125

Re: Paintball Artillery Gun

You could also spring-load them or even just add a larger handle to the valve as well. I think with a few bucks worth of tubing/fittings, and a small 1/4" ball valve, you could really make those three sprinkler valves work a lot better as well though, all depends on what you want to do.
by mark.f
Sat Jun 12, 2021 12:36 pm
Forum: Pneumatic Cannons
Topic: Paintball Artillery Gun
Replies: 3
Views: 125

Re: Paintball Artillery Gun

Neat! We need a few more details on how it works, it looks like there's 3 sprinkler valves and the chamber can't be the whole length of that bottom pipe (or could it?). Only suggestion I have is to pneumatically pilot the three valves instead of electronically. You can hear the diaphragm "honking" t...
by mark.f
Fri Feb 26, 2021 8:02 am
Forum: BB, Airsoft, and Pellet Guns
Topic: Victorian "Air Cane" brought back to life
Replies: 22
Views: 1917

Re: Victorian "Air Cane" brought back to life

jackssmirkingrevenge wrote:
Fri Feb 26, 2021 7:43 am
Took it down to 600 psi and the results were very different:
So when do we get to see the unbalanced spool valve that opens with the anemic 19th century hammer at 3 kPSI? :mrgreen:
(just kidding)
Good job noticing what the problem was. Much better fix than machining a spacer.
by mark.f
Thu Feb 25, 2021 7:22 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Victorian "Air Cane" brought back to life
Replies: 22
Views: 1917

Re: Victorian "Air Cane" brought back to life

Nice! That mainspring certainly is the "folded from a piece of spring steel" kind from percussion and flintlocks. Absolutely beautiful and amazing it still works today compared to modern springs from only a few decades ago. :D How finely have you tried adjusting the distance between the barrel and v...
by mark.f
Mon Feb 15, 2021 9:30 am
Forum: BB, Airsoft, and Pellet Guns
Topic: Let's talk nerf blasters
Replies: 10
Views: 1884

Re: Let's talk nerf blasters

Hmmm.
You know, a PCP using nerf darts wouldn't even have to use that high of a pressure. ;)
by mark.f
Thu Feb 11, 2021 7:37 pm
Forum: Hybrid Cannons
Topic: Rapid Fire Hybrid System
Replies: 20
Views: 2939

Re: Rapid Fire Hybrid System

Just dropping in a couple of weeks late to say: looks nice and hope to see some more progress. :D
by mark.f
Tue Feb 09, 2021 11:57 am
Forum: Pneumatic Cannons
Topic: The Yeet Machine
Replies: 6
Views: 802

Re: The Yeet Machine

Nice build! Sorry you couldn't get that valve to work, for future reference, a barrel-sealing valve is a lot, lot easier to build (I built my first one and "controlled equalization" with some duct tape and petroleum jelly around some solid PVC rod) and usually performs better to boot (depending on t...
by mark.f
Tue Feb 09, 2021 11:47 am
Forum: BB, Airsoft, and Pellet Guns
Topic: Crosman 1330 "Thumper" concept
Replies: 6
Views: 914

Re: Crosman 1330 "Thumper" concept

jackssmirkingrevenge wrote:
Tue Feb 09, 2021 11:23 am
I'm guessing you had missed this one? viewtopic.php?t=26708
I DID, nice.

Also lol at hectmarr's last post.
by mark.f
Tue Feb 09, 2021 11:28 am
Forum: Pneumatic Cannons
Topic: 3D printing?
Replies: 9
Views: 1127

Re: 3D printing?

Yep,

Regardless of how much I'm annoyed I can never make the investment in time and resources to get started 3d printing, it is the future.

If you can make a 9mm carbine with 3d printed parts, there's no reason you can't make spudgun parts. :D

FGC-9_Photo_Components-1-scaled.jpg
by mark.f
Tue Feb 09, 2021 11:23 am
Forum: Hybrid Cannons
Topic: Need help
Replies: 15
Views: 1682

Re: Need help

Second here for using a burst disk and syringe metering. In terms of complexity, the next step up from that would probably be manometric (using chamber pressure to measure fuel and air) fueling. The type of fueling SB15 uses on his cannons is volumetric ("air through meter" design which is pretty ac...
by mark.f
Tue Feb 09, 2021 11:14 am
Forum: BB, Airsoft, and Pellet Guns
Topic: Crosman 1330 "Thumper" concept
Replies: 6
Views: 914

Re: Crosman 1330 "Thumper" concept

Straaaange timing, both this post and me happening to check my "Spudfiles" label in gmail. The 1322 I want to "breathe on" is in the mail right now. (along with a steel breech and longer barrel) I still have to source the 1389 pump handle for a "1389 clone" (which was difficult in 2008, I can't even...
by mark.f
Sun Aug 16, 2020 6:09 am
Forum: Combustion Cannons
Topic: Arduino automated spudgun fuel injector
Replies: 9
Views: 2581

Re: Arduino automated spudgun fuel injector

Let's do the math for puff metering a hybrid with a closed chamber. We'll use numbers a bit different from mine, to make the example clearer. I've sanity checked the result and double checked some of the math, but if someone wants to check and verify (both thinking and actual math) it's appreciated...
by mark.f
Wed Aug 05, 2020 8:02 pm
Forum: Combustion Cannons
Topic: Arduino automated spudgun fuel injector
Replies: 9
Views: 2581

Re: Arduino automated spudgun fuel injector

Nice job on the circuit. I'm a man that can appreciate the work required to compact something onto perfboard. If you're interested (probably not given the work put into the current iteration) an ATTiny takes up even less space but that's not always a priority. The TMBA's meter is pretty much it. You...
by mark.f
Wed Aug 05, 2020 7:48 am
Forum: Combustion Cannons
Topic: Arduino automated spudgun fuel injector
Replies: 9
Views: 2581

Re: Arduino automated spudgun fuel injector

Nice! I had dreamed up something similar in the shower, but using a fuel injector and alcohol since it would be easier to measure the amount of fuel injected vs. pulse width. Your idea of placing the outlet underwater under an inverted graduated cylinder was a good idea, maybe I could look into doin...
by mark.f
Thu Jul 16, 2020 11:25 pm
Forum: Off-Topic Hobbies
Topic: "Offtopic-posts-topic" NSFW
Replies: 6630
Views: 420049

Re: "Offtopic-posts-topic" NSFW

I don't know about you but no amount of fancy ARs or AKs, custom built or exotic auction win will ever seem to replace the feeling you get after completing a big "spud" launcher and firing it off for the first time. I've even had the honor to shoot .50 BMGs out here in Colorado at truly long ranges...