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Need air compressor/tool help!

678 Views 9 Replies 6 Participants Last post by  68CVert
Does anyone know of a good site where I can read up about air compressors and tools? I'm trying to decide what kind of compressor and tools to buy.

My SWMBO bought a small 2hp 6gal compressor for fathers day (bless her heart for the thought). It only has a 3.9cfm rating at 40psi. My brother has a 1.5hp 20gal sears compressor rated at 7.9cfm at 40psi.

Is either one of these acceptable for restoration work. I don't plan on doing any painting, just welding/grinding/cutting, etc. Does HP matter much or is the cfm and psi rating more important? I'm new to this and would really appreciate help.

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...enter air compressors into the search field and click search.

Then search again for air tools.

There is a tips/technical section that tells all about air consumption, etc.
Unless you're doing continuous work, like running an air grinder/sander or blast cabinet, it's the pressure that does the work for you...if your unit can make 90 psi, you'll be able to do a number of things, maybe just not for long..

Your small unit will be great for staple/nail guns, a small air drill, and of course, airing up tires, pool toys etc.

Your brother's unit would be better suited to running an impact, 1/2" air drill, die grinder, etc. You can run them on yours but just not for long (combination of low cfm at a useable pressure and small tank)

In the shop, I use electric tools for most sanding/grinding work, except for a die grinder, which is air. I use air mainly for running drills and impact wrenches. I'm still using the same compressor I started the business with back in the 80's, a single-stage twin CH with 60 gallon tank. I replaced the 5hp single phase motor with a 3hp 3phase motor and it works a whole bunch better...other than running a sandblaster/blasting cabinet efficiently, it's done everything I need, and I use it every day.
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So....I should use my brothers compressor, return the one my SWMBO got me, and get tools with the money from the return/forums/images/icons/smile.gif. SWMBO is OK with that...god she's great!

Thanks everyone! That's the kind of info I needed, you guys are the BEST!!!
I liked this site. This guy wrote up how he decided on his air compressor.

I would say, if your brother is amenable, that would be a good course of sure he understands that he can borrow your air tools as well..*G*

If you plan on using air or air tools regularly, save up and get a compressor like I have in the shop...they're not that much more expensive and will last you a lifetime if maintained..
Select the air tools you plan to buy. Be sure to note down their ratings (e.g., 80psi @ 3g). Be sure the compressor you select exceeds the rating of the highest tool you plan to use and have a 30% margin. My Sears compressor is rated at 120 lbs at 6g and its just big enough to run my impact wrench efficiently...sounds like the one your wife bought. If I use the wrench a lot, the compressor will run continuously. It's enough for what I do with it but has no extra reserve.
Even you are not professional, spend $100 bucks more and buy the compressor with higher CFM. I did that mistake and have to change it to better.
If you not painting or grinding/cutting, 5hp to 7hp with
6CFM/90psi and 8CFM/40psi will doit. Only difference will be on the time to get it back to full pressure. That's why two cylinder 230V are more convenient.

Bellow is link what I bought.
Thanks again everyone. My brother said I can use his as long as I want/forums/images/icons/smile.gif and it won't cost me a thing....except for an air line (he doesn't have one) and tools. I returned the small one that my wife got, and got a 4.5" Dewalt 7.5 amp angle grinder and a good movie from Costco (I even got some change back from the deal). The movie was an impulse item/forums/images/icons/smile.gif.
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