Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
quote:Originally posted by kkeerroo:
it runs of 3750psi Nitrogen and where are you going to get that from?
BOC.
I have been looking into nitrogen lately. There is one safety issue that should be remembered. Our bodies are designed to check for carbon dioxide rather than the lack of oxygen. You could become oxygen deprived if you were to have a leaking nitrogen tank in an enclosed space such as a car or closed off room. The other issue is the cryogenic effect of the gasses going from high to low pressure.
CO2 deffinitely lasts a lot longer than when I used to pump up a tank with 180 psi of air. The air system used to give me four good attacks. The new system gives me twenty six attacks. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Thu Mar 10, 2005 5:40 am
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
I would probably be using normal air similer to what el b uses, but has anyone worked out a simple but effective spring axe setup? _________________ ( •_•)
I'll believe it when i see it... (im not saying its IMPOSSIBLE, but i doubt you could get much energy to weight ratio out of it). _________________ ( •_•)
It's an extremely light and *expensive* according to Mario, the unit can run at 4000psi on the 50mm bore ram. Do not say that it will not get that much energy, hydraulics do wonders with force, look at a 2kg bottle jack, a 2 year old can jack up a car with one..... Not much force put in, but large amount put out. Speed is the only sacrifice unless your running a two stage pump. _________________ https://www.halfdonethings.com/
Thu Mar 10, 2005 6:32 pm
dyrodium Experienced Roboteer
Joined: 24 Aug 2004
Posts: 6476
Location: Sydney
Well, ok, you've convinced me! But anyway, back on the topic, does anyone have any diagrams or price estimates for a pnumatic axe? _________________ ( •_•)
Costs: anywhere from $10-$10000 once again, like every other question asked, it DEPENDS
Diagrams: PM me your email address and I'll send through a few of my CAD designs for pneumatic axes/hammers _________________ https://www.halfdonethings.com/
Fri Mar 11, 2005 8:42 am
kkeerroo Experienced Roboteer
Joined: 17 Jun 2004
Posts: 1459
Location: Brisbane
This weekend I decided to play around with a simple bike pump pneumatic setup and I have found out it ain't that simple. I have the 12V air compressor linked up to two 2L coke bottles with some 13mm garden water system piping and a selanoid valve for a sprinkler system. The problem is I can't build up any pressure. I've traced it down to the tubing going into the coke bottle and I'm not getting an air tight seal between the hole I drilled into the lid and the tubing. I've tried making my own rubber seals, but they don't work and neither does coating it with silicon.
Rex's robot chalange does it by sticking a tube down the pipe to cause it to expand and get a tight seal, but I can't do that as the pipe I'm using is too rigid. Any idea's? How does El Bravo do it? _________________ Get Some!!!
Secretary of the Queensland Robotics Sports Club inc.
Sun Mar 13, 2005 5:42 pm
TeamFroggy
Joined: 15 Jun 2004
Posts: 81
Location: Brisbane Qld
You could try an epoxy based glue/sealant link JB Weld or Araldite but put it on inside the bottle so the air pressure is pushing it into the leak not out of it. _________________ Regards,
Marshal J.
Sun Mar 13, 2005 6:56 pm
timmeh Experienced Roboteer
Joined: 20 Jul 2004
Posts: 2523
Location: Victoria
Where did you get the selenoid valve from?
How many psi you reckon it would handle? _________________ Tim Team Reaper.
Sun Mar 13, 2005 7:29 pm
kkeerroo Experienced Roboteer
Joined: 17 Jun 2004
Posts: 1459
Location: Brisbane
The valve was $22 from Mitre 10 and says it runs on 24Vac but works fine on 12Vdc. We actually got interested in them after seeing them on a site where a bunch of guys were building spud guns. That had a picture with a valve that looked very simalar and they were running it at 150psi+, so we figured it would work for us. _________________ Get Some!!!
Secretary of the Queensland Robotics Sports Club inc.
Sun Mar 13, 2005 8:16 pm
Ajax Experienced Roboteer
Joined: 17 Jun 2004
Posts: 298
Location: Sydney
To solve the air leek problem, I use 401 locktite it is a supper glue. But it is not cheap.
As TeamFroggy said. The Epoxy will do a good a job.
Please let me know how the water solinode works out, I am very interested. My thought is there could be some problems with it.
Try and find a Factory equipment surplus junk yard.
You will be able to get Solinod's, Air line, and fittings you need. Should be cheap as well. _________________ It's all about the destruction.
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