9mm Bullet Atomizer

In this video, I show the first in a series about changes coming to the foundry this summer.

Category:

Science & Technology

Tags:

• doug's
• lab
• metalcasting
• atomizer
• burner
• blower
• waste
• oil

[asmotaku]

Sorry, missed some words in my last sentence. I meant : "a 300W to 500W FRIDGE COMPRESSOR... sorry 'bout that.

I'm currently using a 420W/h fridge compressor in my babington burner. The compressor outlet is feeding an old 7oz paintball CO2 cartridge, acting as a pulse dampener (it reduces the compressor stokes using the air's elasticity). A brass doorknob (actually it's an old curtain stopper) is fitted to the 1/8" thread of the cartridge and acts as the injector. Makes an 2 feet flame.

[zhmapper]

How big is the jet hole in the doorknob? Do you know what pressure it normally runs at? Also, my compressors came from air conditioning units and not refrigerators. I know the concept is the same, but for some reason air conditioners have rotary compressors and refrigerators have reciprocating compressors (for the most part). I wonder if it has to do with flow vs pressure differential? The rotary compressor I'm using pulls 2.7A when pushing against an 80 PSI differential, so about 300W.

[MrSladeCintron1]

I love it when you read the comments on a nerdy video and you understand everything the person is saying. GO NERDS

[lexichronicle2]

I remember we discussed this a fair amount on Hobbicast many years ago, in my teens.

Everyone kept getting yellow flames. At the time, I was reading "how to build a model turbine" by kurt shreckling and thought it might produce a blue flame if the oil was run through a heated coil, as it is in the model jets.

I can answer the pressure question, to an extent. When a piston style fridge compressor is blocked off, it will reach over 500psi. It can produce about 50->10mBar as a vacuum source

[asmotaku]

The hole in the doorknob is about 0.3 millimeters (not more). I remember breaking many drill bits before having it properly pierced (Dremel or Proxxon micro-drills are to shaggy to keep the bit steady while drilling).

Scroll compressors (as yours) offers higher airflow and really good pressures, but are more expensive, probably due to the tricky parts required to seal the scroll caps (as tricky as sealing a triangular piston in a wankel rotary engine).

[asmotaku]

Still, you're gonna drain 1kW/h, hmmm ?

Isn't low air pressure what's making the Babington atomizer so appealing ? (a 300W to 500W is more than sufficient then)

[lizardguy9]

Where did you find the air conditioner compressors?