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 45 users online :: 4 registered, 0 hidden and 41 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

The Offcial Machinist Thread: Revised 01/04/2014

A place to ask general spud cannon related questions.
Sponsored 
  • Author
    Message

Unread postAuthor: jackssmirkingrevenge » Sat Jul 27, 2013 7:26 pm

Ah, finally! Nice work :)

Some advice on baffle design, the holes should be bigger... did you drill them or mill them out?

How exactly does a gas blow-back airsoft gun works?


Image

Image

http://arniesairsoft.co.uk/?filnavn=/ar ... sagbb.html
  • 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: wyz2285 » Sun Jul 28, 2013 5:32 am

I drilled them with my mill.
These are 6mm holes, the bullet pass is 8mm, I didn't want the holes be bigger than that. But I could drill 2 more on each stage.
Both design looks complicated and wast gas, I'm doing my own :lol:
  • 0

CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
User avatar
wyz2285
Major General
Major General
 
Posts: 2244
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Country: Portugal (pt)
Reputation: 12

Unread postAuthor: jackssmirkingrevenge » Sun Jul 28, 2013 5:46 am

wyz2285 wrote:These are 6mm holes, the bullet pass is 8mm, I didn't want the holes be bigger than that. But I could drill 2 more on each stage.


They should be bigger than the hole for the bullet. The idea is to create a swirling vortex of gas which then makes a barrier making it more difficult for the following gas flow to exit.
  • 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: wyz2285 » Sun Jul 28, 2013 5:55 am

What if I drill 2 more holes? 10mm holes may be larger than the shank
  • 0

CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
User avatar
wyz2285
Major General
Major General
 
Posts: 2244
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Country: Portugal (pt)
Reputation: 12

Unread postAuthor: jackssmirkingrevenge » Sun Jul 28, 2013 6:12 am

Either bigger hole, or more smaller holes :)
  • 0

Attachments
bafflemod.JPG
bafflemod.JPG (14.04 KiB) Viewed 343 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: wyz2285 » Sun Jul 28, 2013 7:32 am

I drilled 2 more on each baffles, didn't notice too much difference through. Anyway, I'm happy with it :D
  • 0

CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
User avatar
wyz2285
Major General
Major General
 
Posts: 2244
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Country: Portugal (pt)
Reputation: 12

Unread postAuthor: Gun Freak » Sun Jul 28, 2013 8:40 am

wyz2285 wrote:Both designs look complicated and waste gas, I'm doing my own :lol:


I like the way you think :D
  • 0

OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna"M16 BBMGPengunHammer Valve Airsoft SniperHigh Pressure .22 Coax
Holy Shat!
User avatar
Gun Freak
Lieutenant General
Lieutenant General
 
Posts: 4969
Joined: Mon Jan 25, 2010 4:38 pm
Location: Florida
Country: United States (us)
Reputation: 11

Sponsored

Sponsor
 


Unread postAuthor: jackssmirkingrevenge » Sun Jul 28, 2013 11:53 pm

Gun Freak wrote:I like the way you think :D


*cough*

;)
  • 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: wyz2285 » Mon Jul 29, 2013 5:19 am

For this first time I proved that a suppressor made by myself really works :D
[youtube]http://www.youtube.com/watch?v=0MEWuoHQ4OM&feature=c4-overview&list=UUOv1720IFInlmbjVF1IDbAw[/youtube]
  • 0

CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
User avatar
wyz2285
Major General
Major General
 
Posts: 2244
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Country: Portugal (pt)
Reputation: 12

Unread postAuthor: jackssmirkingrevenge » Mon Jul 29, 2013 5:52 am

Nice...as you say though, with an AEG most of the noise comes from the motor and gearbox. You could have done a series of noise measurements with no BBs and your finger over the muzzle.

Were you shooting BBs after all? If no, then the test is invalid because the BB has a "blocking" effect which encourages turbulence in the suppressor. If yes, then you need to be shooting at a soft pillow or something which absorbs the sound, or into the air, otherwise projectile impact noise is interfering with your measurements.

Have a look at this Silencerco test:

[youtube]http://www.youtube.com/watch?v=R_AXHihPvBc[/youtube]

Note how they rest the muzzle on the post so it is always in the same position relative to the microphone.
  • 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: wyz2285 » Mon Jul 29, 2013 6:01 am

Were you shooting BBs after all? If no, then the test is invalid because the BB has a "blocking" effect which encourages turbulence in the suppressor.

I thought so, I basically took all the shots to my bed :lol: I however also did some shots with no bbs, didn't notice the difference, perhaps the bullet passage is too large.
Note how they rest the muzzle on the post so it is always in the same position relative to the microphone.

I did that too, the distance between the muzzle and the microphone were always the same (not exactly, but not big enough to make a difference)
You could have done a series of noise measurements with no BBs and your finger over the muzzle.

I did try that, and to be honest the noise isn't much quieter than with the new suppressor, I forgot to record them through, should have thought about it :(
  • 0

CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
User avatar
wyz2285
Major General
Major General
 
Posts: 2244
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Country: Portugal (pt)
Reputation: 12

Unread postAuthor: jackssmirkingrevenge » Mon Jul 29, 2013 6:11 am

wyz2285 wrote:perhaps the bullet passage is too large


This is definitely a factor.

In my own experience, the difference in noise between having a 7.5mm port and 6.5mm port for a 5.5mm rifle is extremely noticable. If you're confident that everything is centered, then you don't need a lot of clearance.
  • 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: wyz2285 » Mon Jul 29, 2013 6:16 am

If you're confident that everything is centered, then you don't need a lot of clearance.
I'm very confident, as the parts need a push to get in.
But I only have 6mm and 8mm drills, so for a 6mm bb 8mm drill was my only choice (considering the inner barrel isn't as long as the outer barrel so the bb will be traveling in a 9mm tube before entering the suppressor I'm not confident with the trajectory of the bb)
  • 0

CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
User avatar
wyz2285
Major General
Major General
 
Posts: 2244
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Country: Portugal (pt)
Reputation: 12

Unread postAuthor: jackssmirkingrevenge » Mon Jul 29, 2013 6:37 am

You could always extend the inner barrel and perforate the end of it.

Image

Again though, this being an AEG, it's going to sound like a sewing machine no matter what you hang off the muzzle...
  • 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: bookyle » Wed Aug 14, 2013 5:19 pm

Again though, this being an AEG, it's going to sound like a sewing machine no matter what you hang off the muzzle...


So true. I have seem people put more than 1k into their aeg upgrading mosfet, gears and what not and when I fired it, it sounded like a cheap toy, even though the external is beefed up.
  • 0


bookyle
Corporal
Corporal
 
Posts: 61
Joined: Mon Dec 05, 2011 6:43 pm
Reputation: 0

PreviousNext

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'