CANned-hAM
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I have a 1.6 HP Kobalt with a 30 gallon tank, 5.3cfm@90psi, 155max psi
The MG725 says it consumes 4.0 CFM at free speed
The MG725 says it consumes 4.0 CFM at free speed
Will my air compressor run a Snap-on impact?
- Thread starter CANned-hAM
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kiatech
Well-known member
For a few seconds
kythri
Well-known member
If the regulator is set at 90PSI, and the compressor truly produces 5.3CFM at 90PSI, and the gun only consumes 4.0CFM, then there shouldn't be any issue with it running "long under load".
OP
CANned-hAM
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Ya I'm not expecting to run it under load for long periods of time. I want the most torque I can afford w/o tearing up tool or compressor
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fury9
Well-known member
Don't expect to break any lugnuts with it
Why? Evidence?
First thing, the brand of impact won't make a difference in this at all.
the only way you would tear it up is if you have to let the compressor run constantly, or more frequently than the duty cycle printed on it. I'm going to guess that's an oil less so its what 40%? should say in the book or on the label. So for any air tool, that is your rule of thumb. Also the CFM the tool uses is coming from the tank, not what the compressor makes. The only time you would use the CFM of the compressor itself is if you have a 100% duty cycle head and plan to continue working constantly while the compressor is running constantly.
Just for reference I run my IR 235G off a 6 gal Bostitch when I do work at my parents house. If it needs to rebuild between each wheel, it's done before I get to the next one anyway. I can usually get 2 wheels rotated before it kicks on. You'll be fine.
the only way you would tear it up is if you have to let the compressor run constantly, or more frequently than the duty cycle printed on it. I'm going to guess that's an oil less so its what 40%? should say in the book or on the label. So for any air tool, that is your rule of thumb. Also the CFM the tool uses is coming from the tank, not what the compressor makes. The only time you would use the CFM of the compressor itself is if you have a 100% duty cycle head and plan to continue working constantly while the compressor is running constantly.
Just for reference I run my IR 235G off a 6 gal Bostitch when I do work at my parents house. If it needs to rebuild between each wheel, it's done before I get to the next one anyway. I can usually get 2 wheels rotated before it kicks on. You'll be fine.
fury9
Well-known member
5.3 @90psi that's why. it'd br faster to just break them by hand, oh did i mention 5.3@90psi?
mikebramel
Well-known member
It will work. It will kick on after about 3 or 4 lugs because of the pressure drop with the smaller tank and teh recovery time won't keep up. There will be a pause with reduced pwoer. The rating of air tools needs to be doubled or tripled for the actual load volume so 8-12cfm is what you would need to be HAMMERING CONSTANTLY.
Do you have any first hand evidence of that? Guys run impacts off the smaller compressors all the time. An impact is quite different in duty cycle compared to say a die grinder or other constant air motor.
I'd have to respectfully disagree on that one. The higher end impacts are more efficient compared to the lower cost ones. Thus if someone is on a limited air output a more efficient impact will gain them more usable power.
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fury9
Well-known member
I do, actually. My ridgid twin stack will not break any lug loose even when it's set at 150psi
Completely different compressor setup than what the OP has. I'm not surprised that rigid couldn't run an impact very long or at all. That is really designed to run a nailer or similar very low duty cycle tool.
signcrafter
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There's something wrong with your impact and/or compressor. Or you are running a really small hose restricting flow. Or your lugs are put on WAY over the torque spec. I have a small dewalt compressor that says 5CFM at 90PSI and it will break lugs all day long.
You aren't holding the trigger of the impact for 10 minutes straight like a sander or die grinder. CFM is a measure of air flow. CFM of a compressor is how much the pump can put out while running. You can have a tank full of air and it will put out as much CFM as your hoses/fittings will allow, with no compressor running.
It will operate the impact to take lugs off no problem. It just means you might have to stop and let the compressor catch up. Also means you won't be able to hammer on a bolt for 1 minute straight.
I won't argue that point; I would hope an MG725 is using air more efficiently than an Earthquake. But the fact is, they are both, in the real world going to use about the same amount of air.
With the same compressor and hose, they are both going to take off the same amount of lugs give or take 1 before you have to wait to build up. A little more power coming from one vs the other and you can see some difference but realistically, to make a helpful prediction its going to be about the same.
kythri
Well-known member
I'd have to agree that there are problems being experienced that are not inherent to the normal operation of these tools.
My first compressor was an Alltrades twin-stack - little 5-gallon job right here:
http://www.alltradetools.com/catalog/21-835486-5-gallon-twin-tank-air-compressor-reconditioned.html
3.3CFM@90PSI
My first impact gun was an old beat-up $5 Craftsman from a pawn shop.
ZERO issues with lugnuts.
I'd expect almost any Ridgid compressor to be better than the Alltrades stuff.
theoldwizard1
Well-known member
I have to agree with zkling. Not the best combo, but a 1/2hp oil-less that produces 100psi with a 3gal tank will do lug nuts. Assuming they were properly torqued and you are using a "reasonable" size hose.
theoldwizard1
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tjmonsen5
Well-known member
My tank is only 25 gallons, and I can probably do 4 cars worth of wheels or more before I would not have enough power to remove any more lugnuts. Impact wrenches hardly use any air, they are very efficient.
On the other hand, my die grinder will drain my tank in less than 1 minute.
You will be completely fine and happy with that compressor!
On the other hand, my die grinder will drain my tank in less than 1 minute.
You will be completely fine and happy with that compressor!
OP
CANned-hAM
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This was more what I was curious will a house hold type air compressor and regular 3/8" air house with 1/4" fittings net a desirable tank to tool CFM flow to support the 1/2" SO impact
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creativecars
Well-known member
NO, Don’t even try it. Snap-On impacts are pneumatic tools designed for professional use only. Moisture from compressing air will cause the impact to get cold, you will even feel it to the touch. If you abuse it in this manner for too long condensation may even appear on the outside of the impact. Please search out a compressor that can provide sufficient amount of pneu’s in both psi and volume. Regular air will render your impact useless.
Sometimes I kid...
Sometimes I kid...
signcrafter
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You have a 30 gallon tank, you will be just fine with that impact. You're using this for home use, like I do and I also have a 30 gallon tank although my compressor puts out more CFM. But you will be able to use that impact just fine. If I were you I would upgrade to a bigger hose and high flow fittings. If your compressor kicks on then just take a minute or two break to let it catch up.