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Detent BB Gun V2

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 01, 2011 11:14 pm

Gun Freak wrote:But there is another issue... a new bb is being sealed in the detent too quickly after the bb before it shoots, so I'll pull the trigger, there is a slight delay, then a rapid fire of bbs... how can I fix this? I know one solution is lowering the amount of air going in, but is there anything else?


Sadly the classic issue with detent mechanisms in BBMGs. Some sort of reciprocating mechanism would still seem to be the only reliable solution, like the airsoft bullet valve as suggested here:

Image

Another possible option is a large diameter low friction piston which blocks off access to the breech whenever there is any pressure in the BB chamber, conceptually something like this, shown at rest (top) and before firing (bottom):
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Unread postAuthor: POLAND_SPUD » Wed Mar 02, 2011 9:11 am

O.M.G.!!
jsr and air cylinders!! we're doomed :D
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Unread postAuthor: jackssmirkingrevenge » Wed Mar 02, 2011 9:25 am

No, it's not what you think! I can explain! :oops:
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Unread postAuthor: POLAND_SPUD » Wed Mar 02, 2011 12:03 pm

...there is no turning back from a dark path

ohh... before you ask - yes, you can be my apprentice
know the power of the dark side!!
:twisted:
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Unread postAuthor: Gun Freak » Wed Mar 02, 2011 7:54 pm

:lol: :lol: :lol:
I actually designed a cool semi auto concept today, I'll go MS paint it...

Edit ok here it is... air in through left, pushes airtight piston to the right until it passes over the hole in the bottom, then the air goes down the blue tube to the detent unit. The rod loads a round into the detent unit when it is pushed forward. The piston has a spring on the right so when the bb pops, you let go of the blowgun trigger and the spring returns the piston to the left and a new bb falls in front of the bolt. Thoughts?
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Unread postAuthor: jackssmirkingrevenge » Wed Mar 02, 2011 10:52 pm

POLAND_SPUD wrote:...there is no turning back from a dark path

ohh... before you ask - yes, you can be my apprentice
know the power of the dark side!!
:twisted:


Don't count on building your own dark army just yet, I'm in hybrid mode at the moment ;)

Gun Freak wrote:air in through left, pushes airtight piston to the right until it passes over the hole in the bottom, then the air goes down the blue tube to the detent unit. The rod loads a round into the detent unit when it is pushed forward. The piston has a spring on the right so when the bb pops, you let go of the blowgun trigger and the spring returns the piston to the left and a new bb falls in front of the bolt. Thoughts?


I so agree with you that I came up with essentially the same thing ;)

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And damn, no wonder the above air piston idea drawn up in the previous post was familiar:

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Unread postAuthor: POLAND_SPUD » Thu Mar 03, 2011 8:44 am

I so agree with you that I came up with essentially the same thing

And damn, no wonder the above air piston idea drawn up in the previous post was familiar:
lol, you came up??

Acctually I suggested it a year ago or so but then you said something along the lines of
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 03, 2011 8:56 am

POLAND_SPUD wrote:Actually I suggested it a year ago or so but then you said something along the lines of
'HERESY!!'


lol I looked up "heresy" and "blasphemy" but didn't find any related posts.

It sounds like the sort of thing I would say though, so I'll give you the benefit of the doubt :D
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Last edited by jackssmirkingrevenge on Thu Mar 03, 2011 10:41 am, edited 1 time in total.
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Unread postAuthor: POLAND_SPUD » Thu Mar 03, 2011 1:49 pm

Yeah, same here... I couldn't find it :oops:

damn... searching 'POLAND_SPUD' + 'air cylinders' gives waaaay too many results :D

ohhh make sure you seal the rod - if air can pass from the chamber to the other side of the piston it won't work
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Unread postAuthor: Gun Freak » Thu Mar 03, 2011 5:28 pm

Damn Jack you just beat everyone :D
I came up with a better design today anyways. Plus mine is was easier to build than the one you posted, although they are similar in how they work. It is essentially the same thing posted before except the air doesn't go through a separate tube to the detent, just around the piston once it passes a certain point in the cylinder. Not worth drawing up, I presume you get the gist of what I'm saying.

Edit, haha, I sketched it anyways :D Once the piston passes the notches in the pipe, the air can go around the seal and to the breech.
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 03, 2011 11:18 pm

Assuming there's a return spring in there somewhere, looks like it would work :)
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Unread postAuthor: ilovefire » Thu Mar 03, 2011 11:57 pm

im not ecactly sure how you want that to work but wont it do what my failed blow forward bolt did?
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why make it if it dosent shoot?
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Unread postAuthor: jackssmirkingrevenge » Fri Mar 04, 2011 1:36 am

ilovefire wrote:im not exactly sure how you want that to work but wont it do what my failed blow forward bolt did?


It will cycle like mad or not at all with constant flow, but for semi auto with pulse air it should be perfect.

Also, I realised that I had posted yet another blow forward + detent design in your thread!.

Image

Clearly it's been floating around in my head long enough to build it, maybe I'll start on a prototype while the hybrid cartridge stuff cures :)
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Unread postAuthor: Lockednloaded » Fri Mar 04, 2011 8:50 am

An easy way to accomplish this with standard parts is to have a 3-way DCV feeding into an air cylinder acting as the chamber volume. When you actuate the 3-way, it "pilots" your chamber volume into the space behind the detent, eventually popping the BB out. You'd probably have to toy around with input pressure and chamber volume in relation to popping pressure, but that'd be easy with threaded fittings, and once you get it it would probably work flawlessly...probably
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Unread postAuthor: POLAND_SPUD » Fri Mar 04, 2011 11:56 am

Technically speaking a detent is a valve... an air/pressure actuated 2 way valve

since you can emulate a 3 way valve with two 2 way valves you don't need a 3 way DCV
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