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Unread 10-08-2012, 01:11 PM   #1
muddmonky
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air compressor scfm question

sorry if this is in the wrong spot but i wasnt sure where to post it.

my question is about air compressor scfm and a few tools im looking at. i know what scfm but its the rating on the tool thats confusing me.

i want to use impact guns and air ratchets mainly so im looking at 26 galon compressors and up. the highest scfm iv seen on a compressor was 10.5 on a 60 gallon and around 7-8 on the smaller ones.

snapons impact gun says...
Air Consumption, Free Speed, CFM (SCFM) [L/MIN] --- 4.0 (29) [113]

well scfm is in () but iv never seen a compressor at home depo that had 29 scfm they only got to a max of like 11 so does that mean i cant run that gun on those 60 galon tanks? or am i sapost to be looking at the guns regular cfm of 4 which means its plenty for that tank to handle.

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Unread 10-08-2012, 03:21 PM   #2
Netpackrat
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If an air tool's consumption exceeds the output of your compressor, what that means is with continuous use you will eventually run the tank down, and have to wait for the compressor to recharge it before you can resume work. For an impact wrench, and the size of compressor you are looking at, don't worry about it. You will not normally run that type of tool continuously. For air sanders/grinders, sandblasters, etc. it can be a big issue.
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Unread 10-11-2012, 02:47 PM   #3
93Survivor
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As was stated, it becomes an issue on continuous use. As a shop compressor running air tools, I'd recommend a 60 gallon minimum with a 80 gallon preferred. It's like nearly every thing else with power/shop tools, your best bet is to buy the best you can afford.

Also make sure of the rating on the compressor. A lot of scfm ratings are based on the absolute peak HP of the motor and not the sustainability of the pump. A good quality 2 stage oil bath compressor, with a quality motor is all that most home guys would ever need.
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Unread 10-11-2012, 03:24 PM   #4
coolin4u
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I know you said get the best you can afford but i cant afford any but gonna buy one anyway.so what can i get by with till i hit the lottery?
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Unread 10-11-2012, 05:45 PM   #5
BESRK
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On a budget, you might try searching CL. I picked up a 5hp 80gal compressor with a low rpm Kellog pump.. thing chugs along at like 800rpm and spits out 15cfm @175psi or so.. and it's quiet enough that you can talk normally while standing next to it.
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Unread 10-12-2012, 01:42 AM   #6
Netpackrat
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Second BESRK on the looking for used compressors. You may be able to get something cheap/free that will either work, or will work once you've put a little effort into it.

When I first bought my house, I was given a monster of an old compressor by a friend who had upgraded. I had to adjust the pressure switch a little, but I used it for several years until the motor finally died. It could have been rebuilt or replaced for not a huge amount of money, but in the end I bit the bullet and bought a new compressor with better CFM (the old one had a huge tank, but it couldn't keep up with my blasters).

Gave the old one to a friend who hauled it off; he's probably still using it. They are out there; you just need to look for them.
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Unread 10-12-2012, 07:26 AM   #7
BESRK
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Not to hijack.. but I've also got an old Kellog 321 Pump sitting in the shop. It needs to be rebuilt (or at least worked on). It was the original pump on my compressor and it finally gave up the ghost. I found a replacement "rebuilt" pump for $400 and replaced it.

The pump is just sitting under a table taking up floor space. I'd hate to just turn it in for scrap but I'm not planning on spending any time on it... So, if anyone local wants it, feel free to PM me and come pick it up. It's in zip 23608.
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Ground Pounder Fab


Lower 2

Guardrail

Down Schoolbus

Slickrock Tellico

Save

Crozet

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