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| jackssmirkingrevenge |
 Posted: 02/17/2010 0:35 AM Post subject: Brutal HPA BBMG idea |
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aspiring machinist
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| McCoytheGreater |
| Posted: 02/17/2010 0:42 AM Post subject: |
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| Could work. Should work. Keep us posted on the gearing. I think we have a couple of these laying around our shop.
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| jackssmirkingrevenge |
| Posted: 02/17/2010 0:45 AM Post subject: |
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aspiring machinist
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I always figured this was the ultimate configuration for high performance in BBMGs but the awkward ergonomics put me off, it's only now (because of the sentry project  ) that I was thinking in terms of gearing it up to make it as practical as a blowgun trigger, watch this space 
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| McCoytheGreater |
| Posted: 02/17/2010 0:56 AM Post subject: |
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| Will do. How will you be gearing the trigger/valve assembly? Rather, what materials will you be using to gear the assembly.
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| jackssmirkingrevenge |
| Posted: 02/17/2010 1:50 AM Post subject: |
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I have a stock of suitable gears in my spares box - one of the items I look out for when cannibalising something before disposaly - and I think it's reasonably safe to say that copious amounts of epoxy will take care of the rest 
Really though you don't actually need gears, it can be done with levers:
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| bradisfun |
| Posted: 02/17/2010 3:26 AM Post subject: |
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Corporal
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this looks like it could make it to my pencel case as i have been looking for a small/compact gun tho i wanted a semi but oh-well the only thing is that i was gonna use like paper scrunched up or blue tack but this is still brotty cool and compact so... yea
but this looks like it would be perfict for the sentry gun project
good luck with it 
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| django |
| Posted: 02/17/2010 4:44 AM Post subject: |
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| Looks great mate ,the rate of fire on this thing would be astonishing to say the least and power would be devestating!! your mag will empty as fast as you can blink I suspect?. Ive never used a HPA Bottle before = what pressure are these generally charged to?, there were guys on the BB MACHINEGUN OWNERS GROUP who ran home made BBMG's on straight Co2 and said they could easily eat a 4X2" peice of wood like butter and thats at 800 psi...
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| psycix |
| Posted: 02/17/2010 5:43 AM Post subject: |
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Actually, a gear is nothing more than a wheel with a lot of levers.
What will you use as a chamber? A one meter cube full of epoxy? Or a thin plastic hull with an epoxy coating that will blow up?
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| POLAND_SPUD |
| Posted: 02/17/2010 6:05 AM Post subject: |
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@psycix
heh good point...
It seems that this can be built with a 1/2" T, length of pipe and a few fittings. In this way he could build something that is both serviceable and strong enough to survive 800 psi
Though he has tendency to avoid the simplest solutions
Last edited by POLAND_SPUD on 02/17/2010 6:29 AM; edited 1 time in total |
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| jackssmirkingrevenge |
| Posted: 02/17/2010 6:05 AM Post subject: |
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| POLAND_SPUD |
| Posted: 02/17/2010 11:05 AM Post subject: |
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| Gippeto |
| Posted: 02/17/2010 11:16 AM Post subject: |
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Well at least that shouldn't blow up in your face.
Unlike TLAR engineered constructs of partially cured binary adhesives. 
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| grock |
| Posted: 02/17/2010 13:34 PM Post subject: |
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| Just out of curiosity, with a BBMG ROF, wouldn't there be a pretty good chance of a bb getting stuck partially in the ball valve, which would stop it from closing? If that is actually a problem, how would you fix it? Also, about how many shots you think you could get off that tank at 450 PSI?
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| jackssmirkingrevenge |
| Posted: 02/17/2010 14:53 PM Post subject: |
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| POLAND_SPUD wrote: | | so... does it work? |
I don't know yet, first of all the tee needs to be modded in such a way that it opens the bottle by repressing the pin (as well as sealing against it) - either that or I'll use the ASA adapter you've seen before, currently serving as my schrader fill station (I have another that's fitted to the pressure washer handle, but I have yet another one on the way). Also, it turns out one of the sockets on the tee (where the ball valve is) is proper forked, no wonder it was lying around
| Quote: | | Unlike TLAR engineered constructs of partially cured binary adhesives. |
LOLOL I had no idea there was an acronym that described the manner in which I tend to work so exactly!
| Quote: | | Just out of curiosity, with a BBMG ROF, wouldn't there be a pretty good chance of a bb getting stuck partially in the ball valve, which would stop it from closing? |
I never had this problem with my 100 psi ball valve strafer, the thing is that the BBs are in motion and are highly unlikely to jam.
| Quote: | | about how many shots you think you could get off that tank at 450 PSI? |
I can only answer that after testing, I'm guessing short firing time but a lot of shots
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| USGF |
| Posted: 02/18/2010 4:38 AM Post subject: |
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| jackssmirkingrevenge wrote: | I have a stock of suitable gears in my spares box - one of the items I look out for when cannibalising something before disposaly - and I think it's reasonably safe to say that copious amounts of epoxy will take care of the rest
Really though you don't actually need gears, it can be done with levers: |
Levers are good, linkage might be better. Heim joints might be overkill, large model RC servo stuff should work well.
USGF
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I think I'll use the printer cartridge aluminium tubing I've been using for my semi and cartridge experiments of late.
- I had a bit of a quick rummage in the workshop, and look what it turned up 