Air pumps/creating vacuums

[rgwalt]

You could make the system using a plexi-glass cylinder, but they are fairly expensive IIRC. I would make the piston using PVC pipe, a pipe cap, and a home-made piston, but that it just me. As far as making it electric, if you make your piston rod threaded, that would be one way to go.

Ryan

 

[Demon-Xanth]

420.com has forums?

 

[NuclearFusi0n]

I don't smoke NEARLY enough to make a electric smoking device worth it in terms of $$$. I haven't smoked in like a month, and even if i had weed i would smoke like once or twice a week on the weekends.

not enough to warrant designing + building a smoking device.
although it's not a bad idea...*ponders*

 

[NuclearFusi0n]

^ for more info

 

[NuclearFusi0n]

OK I found some stuff at McMasterCarr, I'm probably going to use 5" diameter plexiglass hollow rod for the chamber (around 6 to 7 inches high), with a plexiglass disc as the piston. I found a bunch of piston sealing stuff, I assume this is the stuff that I wrap around the plexi disc to make it airtight as it moves up and down. Can any hardware guru walk me through what I need to look for?

 

[NuclearFusi0n]

bueler?

 

[B00ne]

what kind of vacuum are u thinking off? If u want to go below like 1 mbar it will be quite expensive ( the vacuum chamber as well as the pump system. To reach decent vacuum conditions usually a combination of a rotary vane pump and a turbo pump are used. The rotary vane pump will establish the prevacuum (maybe around 1 mbar) untill the pressure is low anough so the turbopump can start working. If u want to get below 10E-5/6 u need even more elaborate pump system (ion getter pumps, cryo traps...)

 

[Ophir]

Originally posted by: B00ne
what kind of vacuum are u thinking off? If u want to go below like 1 mbar it will be quite expensive ( the vacuum chamber as well as the pump system. To reach decent vacuum conditions usually a combination of a rotary vane pump and a turbo pump are used. The rotary vane pump will establish the prevacuum (maybe around 1 mbar) untill the pressure is low anough so the turbopump can start working. If u want to get below 10E-5/6 u need even more elaborate pump system (ion getter pumps, cryo traps...)

Have you seen his schematics? I really don't think he's going for 5/6 vacuum.

He gets an A for effort if he builds a turbopump or cryo trap, though.

 

[BennyD]

it might be simpler to make a bellow kind of pump

or even a centrefugal(sp?) pump

 

[BennyD]

i mean a pump like this

 

[NuclearFusi0n]

That looks harder to build to me (and i lose the ability to use plexiglass)
How would it be built anyways?

 

[BennyD]

Originally posted by: NuclearFusi0n
That looks harder to build to me (and i lose the ability to use plexiglass)
How would it be built anyways?

2 sheets of plexiglass, hinged at one end, seal some rubber between the two sheets all the way round, 2 valves in the rubber and connect 2 hoses.

a bellows pump is far better for gases that a piston, piston is better for liquids cause it only uses a small volume for high energy input.