Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 72 users online :: 4 registered, 0 hidden and 68 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Sentry Gun Project

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
Sponsored 
  • Author
    Message

Unread postAuthor: inonickname » Fri Feb 19, 2010 11:12 pm

I had a 2mm barrel for a small gun I made a while ago, and that was fun to use. It would fire several bbs at a time through a coke can. A bit less KE is probably good incase it decides to shoot at something you don't want it to.
  • 0

PimpAssasinG wrote:no im strong but you are a fat gay mother sucker that gets raped by black man for fun
User avatar
inonickname
Lieutenant General
Lieutenant General
 
Posts: 2606
Joined: Sun Dec 07, 2008 3:27 am
Reputation: 0

Unread postAuthor: USGF » Fri Feb 19, 2010 11:26 pm

Get servos big enough and you could sit in the turret and ride along. :D

USGF
  • 0

User avatar
USGF
Master Sergeant
Master Sergeant
 
Posts: 173
Joined: Sun Mar 08, 2009 5:39 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sat Feb 20, 2010 2:05 pm

inonickname wrote:I had a 2mm barrel for a small gun I made a while ago, and that was fun to use. It would fire several bbs at a time through a coke can.


2mm would probably have been more practical, if anything exponentially better than 1mm, but I wanted to go as small as I could.

A bit less KE is probably good incase it decides to shoot at something you don't want it to.


If there was a serious risk of that I shouldn't be doing it at all :P

Get servos big enough and you could sit in the turret and ride along.


If only I had the space :D

I had a play with the IR sensitive camera, good for low light but useless in bright sunlight...

The gun itself is in progress and curing as per the diagram below, I didn't bother with vortex blocks because the porting is so wide relative to the projectiles that it seems unnecessary, we'll see how justified my mindless optimism is :) it should be safe for HPA testing on Monday.
  • 0

Attachments
sentryaction.GIF
sentryaction.GIF (4.98 KiB) Viewed 921 times
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: iknowmy3tables » Sat Feb 20, 2010 5:00 pm

Only testing will prove it's actual effectiveness, but I fear that you might damage your valve especially during moments when the opening isn't large or small enough
  • 0


iknowmy3tables
Major General
Major General
 
Posts: 1558
Joined: Fri Dec 15, 2006 3:57 pm
Location: maryland
Country: United States (us)
Reputation: 0

Unread postAuthor: inonickname » Sat Feb 20, 2010 7:19 pm

The valve will be farily strong, and the bb's wont have accelerated too much by the time they reach the valve so it shouldn't be too much of a problem.
  • 0

PimpAssasinG wrote:no im strong but you are a fat gay mother sucker that gets raped by black man for fun
User avatar
inonickname
Lieutenant General
Lieutenant General
 
Posts: 2606
Joined: Sun Dec 07, 2008 3:27 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sun Feb 21, 2010 1:48 am

inonickname wrote:The valve will be farily strong, and the bb's wont have accelerated too much by the time they reach the valve so it shouldn't be too much of a problem.


This is what I'm betting on, I'm not really worried about this in this case though it might be an issue with my larger 0.177" version.

Here's a mockup of the system as it cures:
  • 0

Attachments
sentrymockup.JPG
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: jhalek90 » Sun Feb 21, 2010 5:17 pm

JSR, your ghetto-ness, and excessive use of epoxy always please me. 8)
But i must ask... where the heck do you get all those darn syringe tubes???
  • 0

jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
User avatar
jhalek90
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 498
Joined: Fri Aug 14, 2009 5:37 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: jackssmirkingrevenge » Mon Feb 22, 2010 1:28 am

jhalek90 wrote:JSR, your ghetto-ness, and excessive use of epoxy always please me.


What can I say, it gives you an incredible amount of flexibility compared to using standard fittings and it's cheaper that a machine shop ;)

But I must ask... where the heck do you get all those darn syringe tubes???


Joys of working in a pharmaceutical laboratory ;) but I imagine you can pick them up at your local drug store.
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: jimmy101 » Mon Feb 22, 2010 1:22 pm

jackssmirkingrevenge wrote:
jhalek90 wrote:But I must ask... where the heck do you get all those darn syringe tubes???

Joys of working in a pharmaceutical laboratory ;) but I imagine you can pick them up at your local drug store.

Or, try a farm supply store. They usually have plastic syringes from a couple cc up to about 60 cc for a buck or so each. They'll also have sharp and blunt largish bore (smallish gauge) needles.
  • 0

Image

jimmy101
Lieutenant General
Lieutenant General
 
Posts: 3127
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Country: United States (us)
Reputation: 7

Unread postAuthor: jackssmirkingrevenge » Mon Feb 22, 2010 2:38 pm

I gave it a whirl and EPIC FAIL :roll:

The BBs are so fine that they clogged up immediately, this clearly isn't going to work. Plan B is to build a conventionally laid out minature vortex block with the valve feeding into the chamber as per my original idea, even when half open the 1/8" ball valve has over 12 times the flow of the 1mm barrel so performance should be just as good.
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: iknowmy3tables » Tue Feb 23, 2010 1:02 am

did you try it upside down too, unless the problem is that bad,
I can imagine this vortex block, probably just a thin sheet of plastic or metal, unless you plan to epoxy it too, to get the 1mm bore exit

jackssmirkingrevenge wrote:
jhalek90 wrote:But I must ask... where the heck do you get all those darn syringe tubes???

Joys of working in a pharmaceutical laboratory ;) but I imagine you can pick them up at your local drug store.

I can beat that, my dad is a respected engineer for the marine corps, where do you think I got my magnalium alloy laptop :lol:
I also got my syringe tubes among other things for being a teacher's assistant for the head of the tech ed department
  • 0


iknowmy3tables
Major General
Major General
 
Posts: 1558
Joined: Fri Dec 15, 2006 3:57 pm
Location: maryland
Country: United States (us)
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Tue Feb 23, 2010 3:47 am

iknowmy3tables wrote:did you try it upside down too, unless the problem is that bad,
I can imagine this vortex block, probably just a thin sheet of plastic or metal, unless you plan to epoxy it too, to get the 1mm bore exit


Upside down the BBs will just fall into the remote line...

I will probably use a bit of 6mm tubing or something similarly tiny, I also ordered a couple of paintball fill nipples for a lighter setup, so this will be a couple of weeks yet. Still waiting on those darn servos anyway. I'll amuse myself with the 4.5mm variant in the meantime :)

I can beat that, my dad is a respected engineer for the marine corps, where do you think I got my magnalium alloy laptop :lol:


In that case your projects aren't as impressive as they should be ;) :D
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: jhalek90 » Fri Feb 26, 2010 4:38 pm

JSR. A cheap range finder can be made from a laser pointer.
Or, u could buy an ultra sonic range finder.


Matter of fact, i once made a simplistic range finder from the lego mindstorms infrared led emitter and receiver.

With the addition of a laser range finder, one could predict the exact range to the target, and account for things such as gravity, and projectile speed loss over distance, and even for things like projectile height.

Just a thought 8)

I am watching you. :twisted:
  • 0

jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
User avatar
jhalek90
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 498
Joined: Fri Aug 14, 2009 5:37 pm
Reputation: 0

Unread postAuthor: SEAKING9006 » Fri Feb 26, 2010 5:04 pm

I've been working on a concept in my mind recently, since I've been working a lot with the PICAXE IC chips. The PICAXE ultrasonic rangefinders are accurate enough to detect a broom handle at 3 meters, and by using two of them in concert with a servo harness, you could in effect make a scanner system suitable for use indoors. A little bit of clever algebra and you can lock onto a target, and fire an airsoft mini at it.

PICAXE chips on their own are fairly inexpensive for use on their won, about $3USD for a PICAXE 14M (14 pin chip, 80 lines of memory. Not great for projects outside of a classroom.) and a bit more for the PICAXE 40X2.

If you get a finalized design that you might wish to mass produce (a PIC controlled shell fuse, for example), to save money you can get a programmer from Microchip for around $50 and just buy the blank PIC's that they make PICAXE chips with.


As some on the forum already know, I've also been searching for a light, cheap laser rangefinder that i can use with a PICAXE for years. Any way i could build one for up to $30 and without having to resort to more expensive microcontrollers would be grand.
  • 0

Completed projects:
CA1 SMSS Basic Inline
CA3 PDAB Airburst Cannon

Current Project: Bolt action rifle (25x140mm + 1in shot)

SEAKING9006
Colonel
Colonel
 
Posts: 734
Joined: Mon Jun 23, 2008 3:20 pm
Location: Texas
Reputation: 0

Unread postAuthor: rp181 » Fri Feb 26, 2010 6:34 pm

  • 0

User avatar
rp181
Brigadier General
Brigadier General
 
Posts: 1090
Joined: Thu Dec 13, 2007 8:47 pm
Reputation: 0

PreviousNext

Return to BB/Airsoft/Pellet Gun Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'