Short question topic

A place for general potato gun questions and discussions.
Air2theBrain
Specialist 2
Specialist 2
Posts: 222
Joined: Wed Apr 12, 2017 5:30 am

Fri Dec 08, 2017 7:44 am

farcticox1 wrote:Sort of how I built mine, but with the fill valve on the back of the slide valve. And A and P are not connected.
Yours is a single chamber also?

Oh wait your filling with compressor through your valve, im doing that for my Cecchino at the moment.

Im building everything hpa now so i wont need the compressor to fill much more.
The pistol plinkers will be precharged semi-auto's.
Air2theBrain
Specialist 2
Specialist 2
Posts: 222
Joined: Wed Apr 12, 2017 5:30 am

Sat Dec 09, 2017 1:28 am

I gave someone a reputation point by mistake..can it be taken back..?
TestingAcc1
Recruit
Recruit
Posts: 1
Joined: Sat Dec 09, 2017 7:26 am

Sat Dec 09, 2017 7:33 am

Air2theBrain wrote:I gave someone a reputation point by mistake..can it be taken back..?
Nope, you can't.
Sincerly,
jrrdw.
Last edited by jrrdw on Sat Dec 09, 2017 7:37 am, edited 1 time in total.
Reason: Added quote.
User avatar
farcticox1
Sergeant
Sergeant
Posts: 1077
Joined: Sun Mar 31, 2013 12:37 pm
Has thanked: 68 times
Been thanked: 93 times

Sat Dec 09, 2017 1:33 pm

will a negative cancel out a positive :?
Air2theBrain
Specialist 2
Specialist 2
Posts: 222
Joined: Wed Apr 12, 2017 5:30 am

Sat Dec 09, 2017 3:00 pm

farcticox1 wrote:will a negative cancel out a positive :?
Haha i received 2 rep points... :P
TestingAcc1 wrote:
Air2theBrain wrote:I gave someone a reputation point by mistake..can it be taken back..?
Nope, you can't.
Sincerly,
jrrdw.
Hola amigo and new member(JNDW) :wink: ...thanks for my point. 8)nd

#9 is my fav number. 8)
User avatar
jrrdw
Moderator
Moderator
United States of America
Posts: 6569
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Has thanked: 39 times
Been thanked: 22 times
Contact:

Donating Members

Sat Dec 09, 2017 4:05 pm

farcticox1 wrote:will a negative cancel out a positive :?
I don't think so.

Who is JNDW?
Air2theBrain
Specialist 2
Specialist 2
Posts: 222
Joined: Wed Apr 12, 2017 5:30 am

Sat Dec 09, 2017 6:28 pm

jrrdw wrote:
farcticox1 wrote:will a negative cancel out a positive :?
I don't think so.

Who is JNDW?
TestingAcc1....AKA jrrdw :roll:

That was a horrendous typo my apologies :oops:
Air2theBrain
Specialist 2
Specialist 2
Posts: 222
Joined: Wed Apr 12, 2017 5:30 am

Mon Dec 11, 2017 6:53 pm

Hey guys if there's heaps of air left in the barrel AFTER the projectile has left...would that mean a smaller chamber would give even better muzzle velocity, performance, etc?
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 26179
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 543 times
Been thanked: 319 times

Donating Members

Tue Dec 12, 2017 12:06 pm

Air2theBrain wrote:Hey guys if there's heaps of air left in the barrel AFTER the projectile has left
How are you quantifying it?
...would that mean a smaller chamber would give even better muzzle velocity, performance, etc?
In a pneumatic a larger chamber will almost always give you better performance for a given pressure, but it's a game of diminishing returns - so for example you might double your chamber volume but only get a 5% increase in velocity, so not really worth it in most cases.
hectmarr wrote:You have to make many weapons, because this field is long and short life
Air2theBrain
Specialist 2
Specialist 2
Posts: 222
Joined: Wed Apr 12, 2017 5:30 am

Tue Dec 12, 2017 1:47 pm

That's what i thought also thanks Jack. :)
Air2theBrain
Specialist 2
Specialist 2
Posts: 222
Joined: Wed Apr 12, 2017 5:30 am

Tue Dec 12, 2017 1:56 pm

I was working on the qev yesterday for one of the pistol plinker's and finally managed to get it to seal whilst filling.

The hole was too small and the spring was a little too long, trimmed that, opened the hole and it sealed, but the 3-way was back to front so it was cycling when pushing forward instead of back.

Almost there but its still not quite 100%.
Once this one is ready then i can put the other one together, but i need to get this right.
Image
Image

Does this look ok so far?
Chamber is of course mocked up, a paint ball tank will be replacing that one.

Forgot to add im having filling problems. thought i had it but not sure what it is now, hope to sort it out soon. :roll:
Air2theBrain
Specialist 2
Specialist 2
Posts: 222
Joined: Wed Apr 12, 2017 5:30 am

Thu Dec 14, 2017 5:33 am

Hi guys i have my hpa tank and pump...pump works great when i tested it with the plug, no leaks, etc.

Removed the bearing from the valve, but having trouble filling it up, what have i missed? :shock:

Is there another fitting/attachment i'm supposed to have apart from the regulator?
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 26179
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 543 times
Been thanked: 319 times

Donating Members

Thu Dec 14, 2017 6:42 am

Removed the bearing from the valve
Bearing?
hectmarr wrote:You have to make many weapons, because this field is long and short life
Air2theBrain
Specialist 2
Specialist 2
Posts: 222
Joined: Wed Apr 12, 2017 5:30 am

Thu Dec 14, 2017 1:19 pm

The Ninja tanks have a bearing/ball valve on the very top of the regulator...

Image
Image

I was wanting to do a few dry fire shots but i can't seem to fill the tank no matter what i try.

Im trying to see if there is anything else i need to make this tank work..i thought i only needed a regulator?

Jack are you using a ninja tank for any of your cannons?

Just want to get this guy full of air and start testing it. :bounce:

Regarding the other project im also on...i cant get the spring right in the QEV. It wont fill from chamber..so im having filling problems at the moment. :roll:
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 26179
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 543 times
Been thanked: 319 times

Donating Members

Thu Dec 14, 2017 3:29 pm

Looking at your mockup, why is the chamber connected to both the slide valve and the QEV? Shouldn't you have a separate firing chamber?
hectmarr wrote:You have to make many weapons, because this field is long and short life
Post Reply