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"wmbjk" > "K.M." > news:9e0pmf$dbh$1@tikehau.netreach.net... > > The one I was looking at has the following: > > > > 6 hp motor > > 120v > > > Ah yes, good ol Sears horsepower again. Rumor has it that the inventor is > working for Moller now. > > Wayne You cant expect more than four or five CFM per horsepower, and CFM is measured as "free air", which is at one atmosphere. The efficiency of any compressor drops as the tank pressure rises, and some compressors are worse this way than others. It has to do with the compressed air that isnt ejected from the cylinder past the exhaust valve at the top of the compression stroke. This air expands on the downstroke and so less fresh air is taken in during intake. Less air in means less air out. You dont need a two-stage compressor for air tool pressures. A waste of money. An HVLP gun using compressor air is a very greedy machine. I have a DeVilbiss that uses 24 CFM. You have to have a compressor that will keep up to it or the paint will be setting up while you wait for more air. The paint wont flow together properly, and the job will be rotten. Get an HVLP that has its own turbine. The Compressed-air HVLP also draws a lot of condensation through the lines from the tank because of the high airflow, and water in the airstream leaves little volcanoes in the paint surface. You need water traps and filters. More money. Dan Thomas Canadian AME, Flight Instructor, Former air compressor rebuilder Jodel D-11 |
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