Search found 361 matches

by MRR
Sat Oct 12, 2013 3:35 am
Forum: Pneumatic Cannons
Topic: Need some advise
Replies: 5
Views: 459

Re: Need some advise

Yea, it looks like a compression tee but without the fittings and the brass rings on it. For comparison, a fully equipped compression tee.... http://www.wickes.co.uk/content/ebiz/wickes/invt/420205/Compression-Equal-Tee_large.jpg You have to keep in mind that you need a good surface inside the tee t...
by MRR
Sat Oct 12, 2013 2:22 am
Forum: Pneumatic Cannons
Topic: Need some advise
Replies: 5
Views: 459

Re: Need some advise

1/2" is small to begin with so I would take a "compression tee" if you mean a tee with a smooth inside and outer threads. edit: Sorry, I looked up compression tee and I don't think it will fit your needs. Find a tee with outer threads and a smooth surface inside or a tee with inner threads + 1/2" ma...
by MRR
Sat Oct 12, 2013 1:58 am
Forum: Off-Topic Hobbies
Topic: YouTube comments (FAIL)
Replies: 35
Views: 3421

Re: YouTube comments (FAIL)

Some people don't understand piston valves hahaha. MRR, you were actually the person who taught me how one works :lol: you proceeded to refer me here because you didn't want to answer any more questions :D that was like 3 years ago... I still give tips and tricks to people that ask politely, but in...
by MRR
Fri Oct 11, 2013 1:49 pm
Forum: Off-Topic Hobbies
Topic: YouTube comments (FAIL)
Replies: 35
Views: 3421

Re: YouTube comments (FAIL)

This comment actually made me laugh :lol:
Apparently he doesn't understand the concept of piston valves.
=> trigger = ball valve
by MRR
Sat Feb 23, 2013 12:50 pm
Forum: General How-To & Discussion
Topic: DIY 3/2 DCV (video)
Replies: 62
Views: 25987

Nice!!!

All you have to do now is to open a thread in the pneumatic cannon showcase section, this definitely deserves its own place. :)
by MRR
Fri Feb 22, 2013 12:18 pm
Forum: General How-To & Discussion
Topic: DIY 3/2 DCV (video)
Replies: 62
Views: 25987

What do you fire with that thing ?


Everything that fits the barrel (22mm ID) or smaller with a styrofoam sabot.
If i use pvs BB”s (airsoft) I have to load 1 by 1 manualy after each shot.


You should build a detent to prevent the bb's from falling out.
by MRR
Wed Feb 20, 2013 1:39 pm
Forum: General How-To & Discussion
Topic: DIY 3/2 DCV (video)
Replies: 62
Views: 25987

That looks really great, I like it a lot. Looks like you had a similar idea for the trigger, yours looks much more sturdier than mine though.

Image
by MRR
Thu Feb 14, 2013 7:28 am
Forum: General How-To & Discussion
Topic: DIY 3/2 DCV (video)
Replies: 62
Views: 25987

Yea, I'm with JSR on this one. The 3-way was more a proof of concept / challenge and it was a pain to make the rod (did it on a drill press). A commercially available 3-way valve would be cheaper and in a much smaller form factor.
by MRR
Wed Feb 13, 2013 5:43 pm
Forum: Pneumatic Cannons
Topic: GGDT isn't showing the same velocities I get with a chrono
Replies: 9
Views: 1379

This is what I wanted to tell you all along after you have posted on my youtube video. The numbers don't really add up (did it in GGDT too).

You should follow Zeus advice and see if it reproducable at greater distance from the chrony.
by MRR
Wed Feb 13, 2013 5:09 pm
Forum: General How-To & Discussion
Topic: How to determine projectile velocity with a phone book
Replies: 49
Views: 4967

This ought to be a follow up but the user I was talking about is a fellow spudfiles user.

Look at his post here:

http://www.spudfiles.com/forums/ggdt-is ... 24963.html
by MRR
Tue Feb 12, 2013 5:44 pm
Forum: Ammo & Parts
Topic: What did i just buy?
Replies: 28
Views: 3536

you'll need to loop the pilot into the middlesection for it to pop open .. Or..take out the bottom center O-ring and THEN plug the side. It doesn't look like it is necessary to pressurize the middle section. If you use a 3-way valve on the pilot and loop it to the chamber, it would work like a cham...
by MRR
Tue Feb 12, 2013 1:08 pm
Forum: Ammo & Parts
Topic: What did i just buy?
Replies: 28
Views: 3536

According to google, PSV stands for Pressure Safty Valve. The picture search revealed a similar design to this one.

It looks like (could be wrong though) that you can screw in a little pressure release valve which triggers the PSV.
by MRR
Tue Feb 12, 2013 10:25 am
Forum: Pneumatic Cannons
Topic: WIP- piston-reservoir
Replies: 3
Views: 478

This concept reminds me a lot of the Zoraki HP-01 compression pistol.
Image

I'm looking forward to see what you will come up with.
by MRR
Tue Jan 22, 2013 4:56 pm
Forum: Pneumatic Cannons
Topic: Help with piston in coaxial QEV (never encountered this b4)
Replies: 14
Views: 2811

So you lubricated the hot glue piston with WD40? I had bad experiences with it, over time the piston became sticky and soft, to a point that I had to remove it with a dowel and a hammer.
by MRR
Sat Jan 19, 2013 5:32 pm
Forum: Hybrid Cannons
Topic: cup shaped bursk disk
Replies: 12
Views: 2117

ok im thinking of a cup shaped piston /burst disk machined out of delrin or something or made by deep drawing with vacuum out of some sort thermoplastic Ok, I get it now, the OP was a little misleading though (I had a piston hybrid in mind). ... Wouldn't machined burst disks be too expensive if you...