Question about Craftsman Air Tools & Compressors

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I need to increase a portable compressor from 7cfm to at least 11 cfm for painting

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Its not reccomeended but most of the time there is a adjustment screw on the pressure regulator or you can change the regulator to a bigger one

Posted on Oct 05, 2009

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If the output of the pump itself is under 11cfm, it can't be done, unless you get a larger tank to hold an air reserve.

Posted on Oct 05, 2009

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Convert scfm to cfm? my compressor puts out 4.9 scfm at 90psi; 7 scfm at 40 psi so how many cfm at 23 psi?


Hard to give an exact number, however, as pressure and temp of air increases, the scfm drops as you see in your numbers. With low pressure such as 0 thru 25 the temp of the air is also low/nominal thus the scfm will be very close to the actual cfm listed for the compressor pump.

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Fix low volume problem sullair 185 does not produce sufficent air to run large jack hammer


Increase the setting on the regulator (on the compressor) or maybe the compressor lacks the cfm output needed to operate the jack hammer

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1 Answer

I have an old craftsman impact gun model number 875-188992. what size compressor do I need for taking off lug nuts/automotive work?


The two most important specs are CFM at 90 psi (that's how fast the compressor can compress more air when the tank starts to run low) and how big the tank is. Virtually any compressor that has a top pressure rating 20 psi higher than you need for your tool (which is usually about 90 psi) and that has a tank of a couple of gallons will work. But the smaller the tank, the shorter time you can operate the tool before the compressor has to kick in. And the lower the CFM at 90, the longer you will have to wait for the tank to come up to pressure again so you can operate the tool at full pressure. If this is for occasional use and you aren't in a hurry, you don't need much of a compressor at all. If you want to operate continuously, then you should get something with a CFM at 90 psi that is higher than your tool's CFM consumption. Keep in mind that impact wrenches don't operate continuously like paint sprayers do. Good luck. Vote if you found this helpful. Al K

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2 Answers

HOW MANY CFM DOES THIS COMPRESSER DELIVER AT 100 PSI


If this is the compressor the amount is 16.2 at 100PSI. PLease see attached link:

http://www.toolfetch.com/p-d55275.shtml

I hope this may have helped,
Tom

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2 Answers

What's the best air compressor for a car paint job?


Painting requires lots of air! I want my compressor to have a MINIMUM 10 gallons or more capacity and provide 6-7 CFM at 90 PSI. The duty rating should be at least 50%. Many compressor have a label on them showing what uses they are well suited for. Start with the gun, the air requirements are usually printed on the packaging, use those as minimums! Good luck!

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1 Answer

Oil dipstick and red twist knob on top of the two pressure gauges


the big red knob adjusts working pressure to hose- refer to book or dowload online

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Compressor Support


Home Use: Compressed-air power tools can dramatically decrease the amount of time spent on a project. Many homeowners will use smaller, portable units (either hand-carried or wheeled) that move easily from the garage to the house, yard or roof. Common air toolsAir Tools such as brad nailersAir Nailers, reversible drillsAir Drills, and impact wrenchesAir Impact Wrenches require about 0–5 CFM (Cubic feet per minute — units in which air flow is measured). It's important to know if the compressor you purchase will drive the air tool you'll need for your project. For example, smaller air nailersAir Nailers run on 2 to 5 CFM at 70 to 90 PSI, while larger shearsShears, sandersSanders and polishersPolishers require up to 10 or more CFM and 100 to 120 PSI. Business Use: Air compressors used for business/professional applications are often classified “industrial grade.” They're packed with features that let you take on more demanding jobs with more horsepower, more CFM, more PSI and more (longer) run times. Though some industrial-grade compressors are portable, many are stationary units with large-capacity, ASME certified air tanks (up to 120 gallons), greater HP, more CFM air volume and faster recovery time to run a wide variety of air tools for as long as you need them to do the job.

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1 Answer

Portable Air Compressor Comparison


Portable air compressors give flexibility to the job both inside and outside the working environment. They're powered by electric, gasoline or diesel engine. A larger portable air compressor often has its own carrying trailer with wheels and handles. You buy a compressor based on its horsepower, pounds per square inch (PSI) and cubic feet per minute (CFM). Choose a portable air compressor to make work quicker and easier. Figure the amount of power you need based on the type of job and air tools used. Know the cubic feet per minute (CFM), such as 5 CFM for small household tools and 10 CFM or more for wrenches or sanders. All air tools have these ratings. Select a gas- or electric-powered engine. Gas gives a higher reliability for frequent use and portability, but consider electric for enclosed areas for its lack of fumes. Pick an air tank based on amount of use time and tools. Large tanks are best for longer use with sanders or grinders and smaller tanks for less time, like wrenches and air hammers. Consider the pump type you need: belt for heavy use or direct-drive for light home use. The quieter belt-drive pump needs periodic oil changes. Buy an inexpensive, small electric portable air compressor for small jobs. These typically operate from a 12-volt power outlet and inflate a 14-inch tire in a few minutes. Get a 150 PSI, 120 volt motor pancake-type air compressor for home use. These light-use models typically carry two air couplers, allowing hook up of two air tools and adequate 25 feet or more air hose. Obtain a larger PSI portable air compressor for bigger jobs, like nailing, with longer continuous use capabilities.

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