Search found 3586 matches

by mark.f
Fri Jun 18, 2021 3:34 pm
Forum: Combustion Cannons
Topic: Pressure Rated PVC Fittings
Replies: 1
Views: 21

Re: Pressure Rated PVC Fittings

It's obviously better to use pressure rated fittings, but in the past me and many others have used DWV fittings for simple combustions. That said, I'd recommend looking on mcmaster and getting what you need. To replace the cleanout adapter and plug just get a threaded adapter and a SCH-80 threaded p...
by mark.f
Thu Jun 17, 2021 10:38 am
Forum: Pneumatic Cannons
Topic: Paintball Artillery Gun
Replies: 5
Views: 218

Re: Paintball Artillery Gun

Just as a matter of opinion: cam locks all day every day. :P In a mounted configuration like yours screw breech works well enough, but any usage where the barrel is free to move in any other axis than forward/backwards (and rotating) they become very annoying.
by mark.f
Thu Jun 17, 2021 10:34 am
Forum: Combustion Cannons
Topic: Trouble with oxy/acetylene mix
Replies: 6
Views: 85

Re: Trouble with oxy/acetylene mix

Not using a torch, just want to know what the best setting would be to set the regulators A regular torch regulator? The flow adjustments are in the torch so you wouldn't be able to get that close with just the pressure regulators. But then again, the flammability limit of acetylene is so wide it w...
by mark.f
Wed Jun 16, 2021 7:55 am
Forum: Combustion Cannons
Topic: Trouble with oxy/acetylene mix
Replies: 6
Views: 85

Re: Trouble with oxy/acetylene mix

If you're just flushing the chamber with fuel/oxygen (displacing all the air that was in the chamber beforehand) you could ignite the torch and adjust the flame beforehand to get the right "settings".
by mark.f
Wed Jun 16, 2021 7:46 am
Forum: Combustion Cannons
Topic: Ignitor not working/no spark
Replies: 2
Views: 50

Re: Ignitor not working/no spark

What kind of igniter are you using? And can you describe how you have the electrodes wired up?
by mark.f
Sat Jun 12, 2021 2:51 pm
Forum: Pneumatic Cannons
Topic: Paintball Artillery Gun
Replies: 5
Views: 218

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: 5
Views: 218

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: 1974

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: 1974

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: 1913

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: 2991

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: 7
Views: 832

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: 942

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: 1143

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: 1712

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...