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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Compressor recommendations
I need a compressor. I saw one today at Home Depot that was an upright on
wheels. A 5hp 115v. unit. It was Husky brand. Anyone have any experience with Husky? I want the piston type, as the others are just too loud. I want to spend $4-$500. I looked at IR, but they are expensive. Craftsman? Hausfeld Campbell? I need something that will run air chisels, paint sprayer, etc, so it has to be around a 2 hp. or more. Suggestions and caveats, please. Steve |
#2
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Compressor recommendations
SteveB wrote:
I need a compressor. I saw one today at Home Depot that was an upright on wheels. A 5hp 115v. unit. It was Husky brand. Anyone have any experience with Husky? I want the piston type, as the others are just too loud. I want to spend $4-$500. I looked at IR, but they are expensive. Craftsman? Hausfeld Campbell? I need something that will run air chisels, paint sprayer, etc, so it has to be around a 2 hp. or more. You can get by with one of those you have named -- all the homeowner brands -- but you will not like them. And by "getting by" I don't mean you'll be able to do whatever you think you need to. You won't have enough air with that thing to run a die grinder or any kind of rotary air tool. They are made mostly for nail guns. And they are *cheap* used. The prevailing wisdom on thig NG is to buy used industrial gear. No, it isn't shiny anymore, and yes you have to know a little bit to get something useful, but I see really usable industrial air compressors all the time in my area in your price range. Try your local craigslist - visit www.craigslist.org and pick the closest city, go from there. Watch it for awhile. GWE |
#3
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Compressor recommendations
"SteveB" wrote in message news:tuI3f.15682$fE5.9470@fed1read06... I need a compressor. I saw one today at Home Depot that was an upright on wheels. A 5hp 115v. unit. It was Husky brand. Anyone have any experience with Husky? I want the piston type, as the others are just too loud. I want to spend $4-$500. I looked at IR, but they are expensive. Craftsman? Hausfeld Campbell? I need something that will run air chisels, paint sprayer, etc, so it has to be around a 2 hp. or more. Suggestions and caveats, please. Steve How much air do you want? Where are you? Can you get to a used dealer in a big city? Have you looked in the classifieds in your area? |
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Compressor recommendations
On Thu, 13 Oct 2005 23:45:56 -0700, "SteveB"
wrote: I need a compressor. I saw one today at Home Depot that was an upright on wheels. A 5hp 115v. unit. It was Husky brand. Anyone have any experience with Husky? I want the piston type, as the others are just too loud. I want to spend $4-$500. I looked at IR, but they are expensive. Craftsman? Hausfeld Campbell? I need something that will run air chisels, paint sprayer, etc, so it has to be around a 2 hp. or more. Suggestions and caveats, please. Steve Ignore the HP ratings. The only meaningful rating is free air CFM at 90 PSI. There are a few "consumer" 5 HP units that will deliver about 11 CFM at 90 PSI. They're OK for occasional use, and they will run most tools including a diegrinder, DA sander, chisels, sprayer, impact wrench, etc. A true 5HP 220-volt motor draws at least 20 amps. There are plenty of 5 HP compressors that still don't deliver much air -- and there are some industrial pumps that can do 11 CFM with 3 HP. Small pumps are all inefficient, but there is a huge variance in how inefficient. Theoretical power +15% friction to deliver 11 CFM at 90 PSI with adiabitic compression (no cooling during compression) ) is only 2.15 HP! Look at the pulley sizes and motor RPM, do some arithmetic. Low pump speed (1100 RPM or less) is quieter and lasts longer. Stay away from direct drive units. The industrial jobs (Quincy, Ingersoll, et al) are definitely better machines, but if your use is "weekender" type where the thing will run for a few hours on some weekends, I think you'd be happy with one of the better "consumer" jobs -- as long as it can deliver enough air. I know several guys that have had them for over a decade. I saw one a few weeks ago at a Farm & Fleet for about $450 that looked OK. I would avoid brands like Campbell Hausfeld and Coleman. I'm not familiar with Husky. Hm. Check out http://tinyurl.com/8nt4u from Northern Tool for $430. It's only 3.6 HP, 15 amps but delivers 11.2 CFM at 90 PSI. |
#5
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Compressor recommendations
"Don Foreman" wrote in message
news Ignore the HP ratings. The only meaningful rating is free air CFM at 90 PSI. There are a few "consumer" 5 HP units that will deliver about 11 CFM at 90 PSI. They're OK for occasional use, and they will run most tools including a diegrinder, DA sander, chisels, sprayer, impact wrench, etc. I'll second that and suggest ignoring any unit that can't produce at least 12 CFM @ 90 PSI with at least a 20 gallon tank. I bought a Porter Cable "Job Boss" [model 3151 iirc] that was "rated" at 6.2 CFM @ 90 PSI. It won't keep up with a Campbell-Hausfeld 6 CMF die grinder. Oh, it'll run it for a short period but not continuously and a sander is out of the question. If you have any desire to do any sand/bead/shot blasting you'll need up to 30 CFM. |
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Compressor recommendations
RAM^3 wrote:
I bought a Porter Cable "Job Boss" [model 3151 iirc] that was "rated" at 6.2 CFM @ 90 PSI. It won't keep up with a Campbell-Hausfeld 6 CMF die grinder. Oh, it'll run it for a short period but not continuously and a sander is out of the question. That's another issue - just as these consumer-grade air compressor vendors overrate the CFM ratings for compressors, so they underrate the CFM on their air tools. I have yet to see an air die grinder which doesn't require a solid 15 CFM at 90 psi to run the air pump at 50% duty cycle or below which is what you should have to avoid wearing out your compressor. Not 6 CFM. Not 10 CFM. FIFTEEN CFM. GWE |
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Compressor recommendations
On Fri, 14 Oct 2005 13:45:39 -0700, Grant Erwin
wrote: RAM^3 wrote: I bought a Porter Cable "Job Boss" [model 3151 iirc] that was "rated" at 6.2 CFM @ 90 PSI. It won't keep up with a Campbell-Hausfeld 6 CMF die grinder. Oh, it'll run it for a short period but not continuously and a sander is out of the question. That's another issue - just as these consumer-grade air compressor vendors overrate the CFM ratings for compressors, so they underrate the CFM on their air tools. I have yet to see an air die grinder which doesn't require a solid 15 CFM at 90 psi to run the air pump at 50% duty cycle or below which is what you should have to avoid wearing out your compressor. Not 6 CFM. Not 10 CFM. FIFTEEN CFM. GWE Which sez your diegrinders need about 7.5 CFM. Diff'rent strokes for diff'rnt folks. Weekend workers are not gonna be running a diegrinder 16 hours per weekend most weekends. Sauce for goose 'n gander, etc. I don't know of any "weekend shop" guy that hasn't been satisfied with his "consumer" 11CFM or so compressor. I think we "advisors" should separate "whut I have" from "whut you should have" when needs of askers may be different from ours. |
#8
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Compressor recommendations
Don Foreman wrote:
On Fri, 14 Oct 2005 13:45:39 -0700, Grant Erwin wrote: RAM^3 wrote: I bought a Porter Cable "Job Boss" [model 3151 iirc] that was "rated" at 6.2 CFM @ 90 PSI. It won't keep up with a Campbell-Hausfeld 6 CMF die grinder. Oh, it'll run it for a short period but not continuously and a sander is out of the question. That's another issue - just as these consumer-grade air compressor vendors overrate the CFM ratings for compressors, so they underrate the CFM on their air tools. I have yet to see an air die grinder which doesn't require a solid 15 CFM at 90 psi to run the air pump at 50% duty cycle or below which is what you should have to avoid wearing out your compressor. Not 6 CFM. Not 10 CFM. FIFTEEN CFM. GWE Which sez your diegrinders need about 7.5 CFM. Diff'rent strokes for diff'rnt folks. Weekend workers are not gonna be running a diegrinder 16 hours per weekend most weekends. Sauce for goose 'n gander, etc. I don't know of any "weekend shop" guy that hasn't been satisfied with his "consumer" 11CFM or so compressor. I think we "advisors" should separate "whut I have" from "whut you should have" when needs of askers may be different from ours. Well said, Don. Every guy has different needs. A consumer-grade compressor might suit you well. If you want a brand new compressor, don't want to spend time tinkering with it, and don't mind a machine which might need replacing in a few years, go for it. But if you like tinkering, want a compressor which will last, and the air to drive your 43 CFM Ingersoll-Rand die grinder (they do make one, I'll find the model number if you like) go for the ex-industrial unit. Chris |
#9
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Compressor recommendations
"Don Foreman" wrote in message ... On Fri, 14 Oct 2005 13:45:39 -0700, Grant Erwin wrote: RAM^3 wrote: I bought a Porter Cable "Job Boss" [model 3151 iirc] that was "rated" at 6.2 CFM @ 90 PSI. It won't keep up with a Campbell-Hausfeld 6 CMF die grinder. Oh, it'll run it for a short period but not continuously and a sander is out of the question. That's another issue - just as these consumer-grade air compressor vendors overrate the CFM ratings for compressors, so they underrate the CFM on their air tools. I have yet to see an air die grinder which doesn't require a solid 15 CFM at 90 psi to run the air pump at 50% duty cycle or below which is what you should have to avoid wearing out your compressor. Not 6 CFM. Not 10 CFM. FIFTEEN CFM. GWE Which sez your diegrinders need about 7.5 CFM. Diff'rent strokes for diff'rnt folks. Weekend workers are not gonna be running a diegrinder 16 hours per weekend most weekends. Sauce for goose 'n gander, etc. I don't know of any "weekend shop" guy that hasn't been satisfied with his "consumer" 11CFM or so compressor. I think we "advisors" should separate "whut I have" from "whut you should have" when needs of askers may be different from ours. I have a Porter Cable "7HP" 60 gallon compressor that keeps up with every tool I have, die grinders, air drills, DA sander. Granted it will not run 24 hours a day powering the tool, but with my use the worst that happens is the compressor runs constantly while the tool is in use. The pressure never drops enough that I have to stop and take a break for the compressor to catch up. For the weekend warrior 10 CFM is just enough. Greg |
#10
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Compressor recommendations
On Sat, 15 Oct 2005 02:05:02 -0500, Don Foreman
wrote: On Fri, 14 Oct 2005 13:45:39 -0700, Grant Erwin wrote: RAM^3 wrote: I bought a Porter Cable "Job Boss" [model 3151 iirc] that was "rated" at 6.2 CFM @ 90 PSI. It won't keep up with a Campbell-Hausfeld 6 CMF die grinder. Oh, it'll run it for a short period but not continuously and a sander is out of the question. That's another issue - just as these consumer-grade air compressor vendors overrate the CFM ratings for compressors, so they underrate the CFM on their air tools. I have yet to see an air die grinder which doesn't require a solid 15 CFM at 90 psi to run the air pump at 50% duty cycle or below which is what you should have to avoid wearing out your compressor. Not 6 CFM. Not 10 CFM. FIFTEEN CFM. GWE Which sez your diegrinders need about 7.5 CFM. Diff'rent strokes for diff'rnt folks. Weekend workers are not gonna be running a diegrinder 16 hours per weekend most weekends. Sauce for goose 'n gander, etc. I don't know of any "weekend shop" guy that hasn't been satisfied with his "consumer" 11CFM or so compressor. I think we "advisors" should separate "whut I have" from "whut you should have" when needs of askers may be different from ours. I am quite happy with the performance from my $12 die grinder powered by my 1/2 HP, 2CFM compressor. Of course if I found a 15 CFM compressor and appropriate motor for the money invested in the present setup ( less than $10 ) I wouldn't turn it down. Gerry :-)} London, Canada |
#11
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Compressor recommendations
On Fri, 14 Oct 2005 15:14:31 -0500, "RAM^3"
wrote: "Don Foreman" wrote in message news Ignore the HP ratings. The only meaningful rating is free air CFM at 90 PSI. There are a few "consumer" 5 HP units that will deliver about 11 CFM at 90 PSI. They're OK for occasional use, and they will run most tools including a diegrinder, DA sander, chisels, sprayer, impact wrench, etc. I'll second that and suggest ignoring any unit that can't produce at least 12 CFM @ 90 PSI with at least a 20 gallon tank. I bought a Porter Cable "Job Boss" [model 3151 iirc] that was "rated" at 6.2 CFM @ 90 PSI. It won't keep up with a Campbell-Hausfeld 6 CMF die grinder. Oh, it'll run it for a short period but not continuously and a sander is out of the question. If you have any desire to do any sand/bead/shot blasting you'll need up to 30 CFM. A small blast cabinet with an S-25 siphon gun from TP Tools works fine on 10 CFM. Not for big jobs, but it's great for small stuff. |
#12
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Compressor recommendations
"Don Foreman" wrote in message
... On Fri, 14 Oct 2005 15:14:31 -0500, "RAM^3" wrote: "Don Foreman" wrote in message news Ignore the HP ratings. The only meaningful rating is free air CFM at 90 PSI. There are a few "consumer" 5 HP units that will deliver about 11 CFM at 90 PSI. They're OK for occasional use, and they will run most tools including a diegrinder, DA sander, chisels, sprayer, impact wrench, etc. I'll second that and suggest ignoring any unit that can't produce at least 12 CFM @ 90 PSI with at least a 20 gallon tank. I bought a Porter Cable "Job Boss" [model 3151 iirc] that was "rated" at 6.2 CFM @ 90 PSI. It won't keep up with a Campbell-Hausfeld 6 CMF die grinder. Oh, it'll run it for a short period but not continuously and a sander is out of the question. If you have any desire to do any sand/bead/shot blasting you'll need up to 30 CFM. A small blast cabinet with an S-25 siphon gun from TP Tools works fine on 10 CFM. Not for big jobs, but it's great for small stuff. Unfortunately, for me, the "stuff" that I'd like to clean up won't quite fit in it. |
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