Hand Pumpability.. And First post :)
Well thats pretty much the exact chamber which is drying on my desk haha.. minus the high pressure rated middle section..
And I attached the end caps using epoxy..
Shrader valve is in the 3 way which connects the blowgun to the chamber and the pump, 1/4 inch fitting is on one end and pressure gauge on the other end of the chamber..
might sit it behind a door once its made and see how high it can go... but it should hold 200 i hope
though when I said a strong chamber I was talking more in the 500psi range
And I attached the end caps using epoxy..
Shrader valve is in the 3 way which connects the blowgun to the chamber and the pump, 1/4 inch fitting is on one end and pressure gauge on the other end of the chamber..
might sit it behind a door once its made and see how high it can go... but it should hold 200 i hope
though when I said a strong chamber I was talking more in the 500psi range
- jackssmirkingrevenge
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In general for >300 psi applications, thick walled metal tubing, properly cleaned and roughened for adhesion, with suitable marine epoxy plugs.more_eggs wrote:What are your tips on making a damn strong chamber?
I stress it must be thick walled, especially if the metal is something like copper or aluminium, because pressure can cause it to expand enough to leak or, at worst (as happened here and here with thin walled aluminium) cause the plugs to pop out, even if the epoxy itself does not shatter.
hectmarr wrote:You have to make many weapons, because this field is long and short life
How about some nice strong fittings designed for it?jackssmirkingrevenge wrote:In general for >300 psi applications, thick walled metal tubing, properly cleaned and roughened for adhesion, with suitable marine epoxy plugs.more_eggs wrote:What are your tips on making a damn strong chamber?
(Zeus kicks JSR in the rear end with remarkable force, yet not enough or too little force to allow a painful JSR pun)
If you go down the epoxy route, drill a hole through the pipe, then pass strong cord or wire through it, if it leaks it won't become a secondary projectile.
I'd strongly recommend proper fittings, an end cap is less than $2 AUD.
Certainly cheaper than an extended hospital stay.
Epoxy can also be somewhat brittle, steel however isn't that brittle under these circumstances.
Good to see another Australian here, we're taking over.
I look forwards to seeing your results.
/sarcasm, /hyperbole
Yeah I hadnt planned on making the end caps from epoxy, just gluing the proper end caps on using it
Wishing the sun would come out so my stuff would set a bit quicker..
Where does everyone get their air fitting and such? Like I said earlier I was looking for a 3 way adapter, but bunnings was no help..
I was thinking like a specialist hoses and fitting store, but it might get a little expensive
Wishing the sun would come out so my stuff would set a bit quicker..
Where does everyone get their air fitting and such? Like I said earlier I was looking for a 3 way adapter, but bunnings was no help..
I was thinking like a specialist hoses and fitting store, but it might get a little expensive
- Crna Legija
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You should have got proper pvc glue and primer because it takes just as long to set and would be stronger
They have a few air fittings in the tool shop part of bunnings right next to nailguns and compressors
They have a few air fittings in the tool shop part of bunnings right next to nailguns and compressors
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You're in Brisbane if I remember right, Bellpro is up there but it isn't cheap, I go to Midland Irrigation for galvanised fittings, and a local hardware store for brass, Home hardware should have all you need though.
Bunnings is ok, Thrifty Link is good in some places, don't know what else you have up there, I'm in Victoria so I don't know the area.
Bunnings is ok, Thrifty Link is good in some places, don't know what else you have up there, I'm in Victoria so I don't know the area.
/sarcasm, /hyperbole
Yeah thats where I got what I did get.. Though no nice Tee fittings ebay has some pretty nice ones for nitrous fittings in cars, annodized and all that... but they go for about $16 each..They have a few air fittings in the tool shop part of bunnings right next to nailguns and compressors
In brissy there’s ( on the west side ) Mobile hose fixers, pirtek ( Expensive), Industrial fitting supplies - The best and cheapest !! bunnings and the hardware shops are really going to sting you for air fittings, even a trade tools of truck supply shop like Qld diesel spares would be better
Thanks Patto..
Yeah ill have a look at somewhere like that next week, though I rekon my home made T fitting will suffice for now..
Anyone rekon I could find one of those crappy little toy guns that shoot bb pellets in chinatown haha.. U know the ones that you find at shows usually, they are really weak and shoot maybe 3 meter, but they come with like 50 BBs..just need some bb's to get me by for a little while and to get the popoff setup properly
Yeah ill have a look at somewhere like that next week, though I rekon my home made T fitting will suffice for now..
Anyone rekon I could find one of those crappy little toy guns that shoot bb pellets in chinatown haha.. U know the ones that you find at shows usually, they are really weak and shoot maybe 3 meter, but they come with like 50 BBs..just need some bb's to get me by for a little while and to get the popoff setup properly
- jackssmirkingrevenge
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I was staring atthis QEV animation and it got me wondering, is the fascination with reciprocal motion a guy thing? In the same way the male gender seems to be obsessed with penetration, putting things in goals and holes, hmmm...more_eggs wrote:Though I really like the breech with moving bolt.. seems so much cooler
I digress, back on topic.
Note of caution, if the BBs are poorly made (not exactly round, visible mould lines) at best they will stick in the breech without sealing, at worst they might tear the seal.one of those crappy little toy guns that shoot bb pellets in chinatown haha.. U know the ones that you find at shows usually, they are really weak and shoot maybe 3 meter, but they come with like 50 BBs
hectmarr wrote:You have to make many weapons, because this field is long and short life
Hahahaha no doubt about it..I was staring at this QEV animation and it got me wondering, is the fascination with reciprocal motion a guy thing? In the same way the male gender seems to be obsessed with penetration, putting things in goals and holes, hmmm...
This is true.. Ill grab some metal bb's tomorrow, but I imagine the pop off pressure would be slightly different for the different weight/surface textureNote of caution, if the BBs are poorly made (not exactly round, visible mould lines) at best they will stick in the breech without sealing, at worst they might tear the seal.
only if the textures are vastly different it might make an effect its more size even a little bit different will affect its pop offmore_eggs wrote:This is true.. Ill grab some metal bb's tomorrow, but I imagine the pop off pressure would be slightly different for the different weight/surface texture
what are the chances of something like this
http://cgi.ebay.com.au/Car-12V-Electric ... 714wt_1184
actually getting to 300 psi?
Even better, just found out I have access to two working portable air conditioning units.. Im thinking these would have some form of compressor in them?
http://cgi.ebay.com.au/Car-12V-Electric ... 714wt_1184
actually getting to 300 psi?
Even better, just found out I have access to two working portable air conditioning units.. Im thinking these would have some form of compressor in them?
Last edited by more_eggs on Thu Nov 25, 2010 5:44 am, edited 1 time in total.