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Tool Talk Discussion Forum

Air compressor

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Fullmer

10-23-2012 14:44:02




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Have a 60 gallon upright Coleman air comp. 6.5 rated hp it has a 3/8 discharge line to tank would it help to increase it to 1/2 , it can't. Keep up with my grinder.




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BDT in Minnesota

10-25-2012 11:08:12




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 Re: Air compressor in reply to Fullmer, 10-23-2012 14:44:02  
Bigger air hose and fittings may help, along with "smaller" air tools..... If you have a homeowner priced unit, don"t count on that being a "continuous 6.5 hp rating"

Like others have noted; the continious cfm/90psi rating is what determines what a compressor will power without stopping for the compressor to catch up.



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markiz41

10-24-2012 06:05:41




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 Re: Air compressor in reply to Fullmer, 10-23-2012 14:44:02  
Sure electric ones are great. But try scrubbing a gasket off a differential housing with one - it won't even make past the sway bar!



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MarkB_MI

10-24-2012 02:28:30




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 Re: Air compressor in reply to Fullmer, 10-23-2012 14:44:02  
By "can't keep up", I assume you mean the pressure drops below the 90 psi regulated pressure normally used for air tools. If that's the case, then the diameter of that air line is unlikely to be the issue. If you're using a 3/8" air hose from your tank to your tool, there's much more pressure drop in the hose than in the short compressor-tank connection.

Consumer-grade compressors are notoriously overrated. A true 6.5 hp air compressor will draw close to 30 amps at rated pressure and CFM. There is a reason Coleman only used a 3/8" line: that's all it needed.

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hoof print

10-23-2012 20:02:59




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 Re: Air compressor in reply to Tank repair, 10-23-2012 14:44:02  
Quoting Removed, click Modern View to see

I'm tell ya mark, CFM at rated psi is what you should be investigating



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Stick welding

10-23-2012 21:25:35




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 Re: Air compressor in reply to hoof print, 10-23-2012 20:02:59  
Air hose size has a lot to do with CFM! If it's an air powered angle grinder, they take a lot of CFM. A 7" air grinder will need a 1/2" or larger air line to get enough CFM. It's no different than a water hose. Say you have a 4" pump that puts out 750 GPM but you only have a 2" hose. There's no way a 2" hose will flow 750 GPM. A 3/8" hose may flow enough CFM but it depends on how much the grinder needs and the output of the compressor.

As to the original question, the compressor in question falls into a grey area as it is not a true 6 1/2 HP motor. It's probably closer to a 1 HP especially if it runs on 115 volts or maybe 2 HP on 230 volts. It it was a 7 1/2 HP would make more sense because they actually make a true 7 1/2 HP motor but it is about 3 times bigger than the fake 6 1/2 HP and would cost about 3 times as much as the whole compressor just for motor alone. I suspect the compressor may be too small to run the grinder once the reserve capacity in the tank is used up. Just like using a big impact wrench, it's good for a few minutes but then the compressor alone won't keep up.

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markiz41

10-23-2012 18:01:57




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 Re: Air compressor in reply to Fullmer, 10-23-2012 14:44:02  
This is interesting, anybody know how many cfm you can push through a 3/8 cross section? I know it's pressure related, so let's say 90 psi..



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j-tex

10-24-2012 10:36:34




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 Re: Air compressor in reply to markiz41, 10-23-2012 18:01:57  
213 CFM @90 psi through 3/8 hose



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markiz41

10-24-2012 15:45:20




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 Re: Air compressor in reply to j-tex, 10-24-2012 10:36:34  
213?! Sure you don't have an extra digit in that number? Why would you need 1/2 hose ever with that flow rate?



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MarkB_MI

10-26-2012 01:58:59




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 Re: Air compressor in reply to markiz41, 10-24-2012 15:45:20  
He didn't specify length.



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RGMartin

10-23-2012 16:25:59




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 Re: Air compressor in reply to scottwv, 10-23-2012 14:44:02  
Quoting Removed, click Modern View to see

If it is the unit I am thinking of, they were a "real" 3hp. 15A 220v.



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Fixerupper

10-24-2012 10:12:38




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 Re: Air compressor in reply to RGMartin, 10-23-2012 16:25:59  
It stirs me up a bit when I see the compressor sales companies using deceptive advertising, calling a 3 HP motor a 6.5. The CFM's is listed on some small barely visible tag. They probably get by with it because it's a CALCULATED 6.5.

I got burned by Craftsman years ago, buying a new table saw that was advertised as 3HP but was really a 1.5 HP. Craftsman lost my business for power tools after that. Jim

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old

10-23-2012 16:04:55




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 Re: Air compressor in reply to Fullmer, 10-23-2012 14:44:02  
Increasing the line size from the compressor to the tank may help some but again it all depends on how much CFM the compressor is rated for and how much CFM it takes to run that grinder. Many tools take a lot of CFM and if say the grind needs 15CFM at 90psi and the compressor if only rated at 12CFM at 90 psi it will not help any



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rodm1

10-23-2012 15:47:43




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 Re: Air compressor in reply to Fullmer, 10-23-2012 14:44:02  
I bet yours is oil less how many amps is the motor? Get a oil lubed 5HP compressor.
This post was edited by rodm1 at 15:48:46 10/23/12.



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hoof print

10-23-2012 15:14:49




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 Re: Air compressor in reply to Fullmer, 10-23-2012 14:44:02  
probably does not have anything to do with the outlet size. What is the rated output of the compressor (cfm) at the psi that the grinder requires? Grinders are air hogs, the compressor may not be enough to run it.



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George Marsh

10-24-2012 05:12:00




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 Re: Air compressor in reply to hoof print, 10-23-2012 15:14:49  
Agree, grinders are air hogs. Ever think of usings electric grinder? I got rid of all my pneumatic sanders and grinders. Use electric instead. Use a dimmer switch and a receptical to make grinders variable speed. Electric grinders and sanders us way less electricity.
George



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Ken Macfarlane

10-24-2012 05:49:00




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 Re: Air compressor in reply to George Marsh, 10-24-2012 05:12:00  
Thats a good point, a 600 watt grinder is about equal to an air grinder that needs a 3500 watt compressor running non stop



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George Marsh

10-24-2012 10:24:39




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 Re: Air compressor in reply to Ken Macfarlane, 10-24-2012 05:49:00  
Ken,
I'm a fan of dewalt tools. Close enough to John Deere yellow. I have three 4.5in dewalt right angle grinders. The biggest ones use 10 amps, 120v, 1200 watts. A 6.5 hp air compressor is going to use way more than 1200 watts. I can't stop my grinders. I have a wire brush on one, a metal cutting disk on another and a grinding disk on the other. I use the dimmer switch on the wire brush. The grinder can do serious damage if it gets away from you. Will never go back to pneumatic tools. Don't leave home without my grinders.
George

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