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Need help with cfm

Discussion in 'Beginners Airbrush Questions!' started by peejay, Apr 14, 2018.


  1. huskystafford

    huskystafford Mac-Valve Maestro!

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    I totally missed this one. lol, now you are screwed. You will do lot's of welding for forum members lollollol
  2. peejay

    peejay Young Tutorling

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    Lol I've been welding for 20 years
    Airbrushing for 0 years
    Willing to trade
    Don't know why I waited so long
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  3. Robbyrockett2

    Robbyrockett2 Air-Valve Autobot!

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    Rule of thumb is to shoot for double the cfm your going to use.
    This is because most smaller (less tHan 3hp)compressor motors have 50 percent duty cycle.
    Big 5HP can have 80 to 100 percent so spray gun setups often get away with less.
    They're often over rated so a little extra doesn't hurt.
    So something rated around 1cfm at 90psi
    Or 1.5 at 40
    Will cover you running 60psi.
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  4. Robbyrockett2

    Robbyrockett2 Air-Valve Autobot!

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    Your assumption was correct but the way I think you came to the 1cfm number wouldn't normally work.
    Output cfm decreases with pressure.
    Usually a compressor that could do 1.5 at 40 can only do 1 at 90
    Or say 3.5 at 40 maybe 4.5 at 90
    So something that does 1cfm at 30 won't do .5 at 60.
    It drops even more with bigger bores.
    Anyhow that compressor will cover you great but wouldn't be great for whipping out 20 shirts a day or something.
    It has roughly 1cfm, probably at 40psi, guessing .8 at 60 or .9 at 60 roughly So its not quite there for constant use but it is adequate.
    Last edited: Apr 25, 2018
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  5. Robbyrockett2

    Robbyrockett2 Air-Valve Autobot!

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    Guessing your in oz... @JackEb can probably give you a lead on a store that sells something similar to the California air line or orazio or emax silent compressors. They aren't AB specific but generally cost way less, especially for higher volume 24l 5cfm type models. Which will have you very well covered and keep up with a fan brush or mini gun should you decide on one of them in the future.
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  6. Robbyrockett2

    Robbyrockett2 Air-Valve Autobot!

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    Sorry I meant something.that does 1 at 30 won't cut it for something that needs. .5 at 60
    It would likely put out .5 at 60 and run more than duty cycle allows.
    Worse, the bigger the numbers your working with. Anyway....
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  7. JackEb

    JackEb The Dragon Hunter Staff Member Admin

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    This is what i got @peejay, you should be able to source something similar in Perth,

    I'd use this one inside without major noise concerns. if you plan on using a spray gun, you'd likely be doing it outside/in the shed so any of the standard workshop compressors from bunnings will do the job, just dont expect them to be very quiet, but on the upside they dont cut in very often.
    https://adelaidetools.com.au/air-to...0l-platinum-series-air-compressor-594140.html
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  8. peejay

    peejay Young Tutorling

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    Hey thanx for clearing that up
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  9. peejay

    peejay Young Tutorling

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    Hey yeah plan on painting in the shed most often in the weekends due to working late during the week. And noise doesn't bother me I wear ear plugs all day so it wouldn't worry me to wear them at home.
    As for the compressor I found one on gumtree for next to nothing, 1.5hp 6.7cfm semi quiet 75db and just got a water trap regulator and connectors from Bunnings. And my paints arrive tomorrow.
    So that should get me started for now.

    As for the compressor you mentioned I'll look into it once I learn the basics.
  10. peejay

    peejay Young Tutorling

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    Anyway thanx everyone for all your help and advice. Would have still been scratching my head.:thumbsdown:
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  11. Robbyrockett2

    Robbyrockett2 Air-Valve Autobot!

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    Sorry for the rambling afterward......got carried away. :)
  12. peejay

    peejay Young Tutorling

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    all good the more info the better
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