help in compresser size
ABOUT THE GALLONS. The tank size has almost NOTHING to do with a compressor performance. All that means is, that for "short use tools," like impacts, air chisels, etc, you won't need as much HP or CFM because the pump can work in between tool uses.
For "long use" (high duty cycle) tools like sanders, grinders, sand blasters, and PAINT GUNS you don't want to go by "gallons" you want to go by TRUE CFM
ABOUT HORSEPOWER HP like everything else, has become an "enhanced math", "imaginary number." Many HP ratings are based on the amount of power the unit draws off the line and NOT shaft HP. This is a simple way of making a small unit seem big
ABOUT CFM
There are TWO big LIES about CFM
The worst is the rating "at SCFM" This is the "best" way of making a SMALL compressor seem BIG because this is the rating at the atmospheric pressure entering the suction port.
The second worst is "at 40 psi." I believe this was coined by people such as Wards and Sears "back when" because they realized that a "bleeder" air gun and most tire filling really only needed 30-40 PSI, so this makes a "medium" copressor sound "big."
The only REAL rating is rated almost universally "at 90PSI" This figure IF IT IS NOT A LIE is the REAL airflow that your compressor can deliver to real air tools.
You need to pick your biggest tool, or the biggest one you expect to obtain, and buy accordingly
DO NOT ever buy a direct drive compressor. Buy a belt drive
Do not buy an "oiless" compressor
Try to buy one with a cast iron pump, or AT LEAST a cast iron cylinder and head
Even some "brands" that used to be "solid" are now peddling Chineseo junk
ABOUT THE GALLONS. The tank size has almost NOTHING to do with a compressor performance. All that means is, that for "short use tools," like impacts, air chisels, etc, you won't need as much HP or CFM because the pump can work in between tool uses.
For "long use" (high duty cycle) tools like sanders, grinders, sand blasters, and PAINT GUNS you don't want to go by "gallons" you want to go by TRUE CFM
ABOUT HORSEPOWER HP like everything else, has become an "enhanced math", "imaginary number." Many HP ratings are based on the amount of power the unit draws off the line and NOT shaft HP. This is a simple way of making a small unit seem big
ABOUT CFM
There are TWO big LIES about CFM
The worst is the rating "at SCFM" This is the "best" way of making a SMALL compressor seem BIG because this is the rating at the atmospheric pressure entering the suction port.
The second worst is "at 40 psi." I believe this was coined by people such as Wards and Sears "back when" because they realized that a "bleeder" air gun and most tire filling really only needed 30-40 PSI, so this makes a "medium" copressor sound "big."
The only REAL rating is rated almost universally "at 90PSI" This figure IF IT IS NOT A LIE is the REAL airflow that your compressor can deliver to real air tools.
You need to pick your biggest tool, or the biggest one you expect to obtain, and buy accordingly
DO NOT ever buy a direct drive compressor. Buy a belt drive
Do not buy an "oiless" compressor
Try to buy one with a cast iron pump, or AT LEAST a cast iron cylinder and head
Even some "brands" that used to be "solid" are now peddling Chineseo junk