Looking for a air compressor what is important - Page 6 - Router Forums
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post #51 of 60 (permalink) Old 04-21-2019, 06:28 PM
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Well the 2 stage compressor I had was quieter than this Dewalt single stage air compressor. My old 2 stage ran at 1750 rpm whereas my single stage runs at 3400 which is louder. The 2 stage air comes off at 175 PSI. I never found I needed that high of pressure. If I can get over a 100 PSI I am good. Everything I did on my 2 stage always was just over a hundred. My old 2 stage never could maintain 175 PSI. The pressure dropped immediately after using the air. But I had an old American made Kellogg air compressor which was old tech as it was built in the 50s.

It was a great old compressor but it would not fit in my shed at my house. It was too big. I gave it to a friend. He is still using it. I had it for over 20 years. I am not sure they are made as well today but we live with what we can get now.
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post #52 of 60 (permalink) Old 04-21-2019, 08:47 PM
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Well the 2 stage compressor I had was quieter than this Dewalt single stage air compressor. My old 2 stage ran at 1750 rpm whereas my single stage runs at 3400 which is louder. The 2 stage air comes off at 175 PSI. I never found I needed that high of pressure. If I can get over a 100 PSI I am good. Everything I did on my 2 stage always was just over a hundred. My old 2 stage never could maintain 175 PSI. The pressure dropped immediately after using the air. But I had an old American made Kellogg air compressor which was old tech as it was built in the 50s.

It was a great old compressor but it would not fit in my shed at my house. It was too big. I gave it to a friend. He is still using it. I had it for over 20 years. I am not sure they are made as well today but we live with what we can get now.
The one I should have kept back in the day ran just over 800 rpm. Bet it was fairly quiet too .
I’m still kicking myself.
I’m going to take your advice and buy a 2 stage ,as it’s the only way I’m going to feel better about this

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post #53 of 60 (permalink) Old 04-21-2019, 10:50 PM
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I looked up the specs for my air compressor. Noise level is Decibel Rating: 80 dBA. It is not rated at what distance. The pump rpm is 2000. This seems loud to me but it may be inline with what is sold today.

PS
I am going to try some antivibration pads to see if it will cut down on noise.

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post #54 of 60 (permalink) Old 04-22-2019, 12:25 AM
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I looked up the specs for my air compressor. Noise level is Decibel Rating: 80 dBA. It is not rated at what distance. The pump rpm is 2000. This seems loud to me but it may be inline with what is sold today.

PS
I am going to try some antivibration pads to see if it will cut down on noise.
I’ve been reading it’s a lot to do with the intakes , and some have found a way to reduce it with different designed filters /housings etc

Best case scenario would be to have it in my tool shed . I’m not happy with how I designed my tool shed , and wanted to replace it . But because unemployments on the horizon, I don’t want to spend 3 grand on another , or I would put the compressor in there and run an underground trench for the power and air

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post #55 of 60 (permalink) Old 04-24-2019, 06:49 PM
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Since most air tools work at 90psi or less the primary advantage to a 2 stage would be storing more air in a given tank size. More energy will be required to take the pressure higher that energy will be wasted as heat. Compressing air creates a lot of heat. You need to dissipate that some how. The little cooling fins on a typical small compressor are not enough to lower the temperature much so you are filling the tank with quite hot air. As the air in the tank cools it contracts leaving you with less useable air & causing the compressor to start again. The warmer the air is the more moisture it can hold. Wet air is hard on almost all air tools and is especially bad for spray guns & paint. So as the air in your system cools it will reach the point where the moisture will condense. Moisture traps will catch some of it but as the tool or spray gun uses the air, the drop in pressure causes rapid cooling resulting in more condensation.
The only real solution is to use a refrigerated or desiccant air drier.

In many ways oil does much the same thing. So you need a filter down stream of the drier to take out the oil. Nothing worse than oil in you painted surface.

Tank size: A big tank doesn't create any compressed air but it does store more. That means it will take longer for a big tank to reach a useable pressure but the pump will have to cycles fewer times but run for longer each time it cycles. Each time a motor starts it draws a spike in power that has to be dissipated as heat. So fewer starts is better. A piston compressor generally isn't able to dissipate heat fast enough and so will get very hot if run continuously. That heat tends to break down the lubricating oil resulting in deposits that will shorten the life of the compressor. Synthetic lubes will hold up better.

Horse power: There are a lot of "cheater" 5HP compressors sold. Motors that don't actually put out 5HP. You can easily tell by the watts or amps the motor is rated for. 745.7 watts = 1 hp but you need to deduct for the efficiency of the motor. To meet NEMA standards the motor must convert at least 84% of its energy into shaft power. So it takes 887 watts to make 1 hp at the shaft. 4434 watts input for 5HP. If you have 115V that means 38 amps. 230V means 19amps. The motor will draw more than twice the running amps at startup. How's your wiring?

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post #56 of 60 (permalink) Old 04-25-2019, 06:20 AM
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an 800 rpm belt drive compressor is the way to go. the direct drive compressors are just a cheap way to compress air, with compromises..
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post #57 of 60 (permalink) Old 04-29-2019, 02:23 PM
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I just put antivibration pads under my air compressor. It is not as loud as it was. The metal on the brick was causing some kind of ringing added to the noise. My brick in that spot is not very level so I have 2 wood boards to level with the antivibration pads on top between the air compressor and the board. I have a ratchet strap around a 4x4 post and attached to the air compressor at the top where the hold down straps go. It is not tight just taught enough to catch the air compressor incase of a problem. If I tighten the ratchet strap to much it lifts the far leg. So just tight enough to keep all 3 legs down. I am impressed with the antivibration pads as they seem to really work. The high pitched sounds are gone and it is more of a lower pitched sound of the air compressor spinning at 2000 rpm. It really is better.
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post #58 of 60 (permalink) Old 04-29-2019, 03:48 PM
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Originally Posted by coxhaus View Post
I just put antivibration pads under my air compressor. It is not as loud as it was. The metal on the brick was causing some kind of ringing added to the noise. My brick in that spot is not very level so I have 2 wood boards to level with the antivibration pads on top between the air compressor and the board. I have a ratchet strap around a 4x4 post and attached to the air compressor at the top where the hold down straps go. It is not tight just taught enough to catch the air compressor incase of a problem. If I tighten the ratchet strap to much it lifts the far leg. So just tight enough to keep all 3 legs down. I am impressed with the antivibration pads as they seem to really work. The high pitched sounds are gone and it is more of a lower pitched sound of the air compressor spinning at 2000 rpm. It really is better.
Great idea . What do anti vibration pads look like and where do you buy? I have some 1/2” rubber.


I’ve been watching KMS tools, and this compressor just came up for sale . Not dual stage , but should be sufficient ,as it’s the same output
https://m.kmstools.com/campbell-haus...pressor-118203

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post #59 of 60 (permalink) Old 04-29-2019, 04:42 PM
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I ordered the antivibration pads from Amazon. I bought 4 inch and they are about $12 to $15 for four. I will try to look up the part number and post it here.

My 20 gal is a Campbell-Haus unit. I have had it for over 15 years without any problems. The one you are looking at looks like it has a better air intake design which may help with noise also. It seems to put out plenty of air for a home system.

https://www.amazon.com/dp/B00BVEMLR4...p_mob_ap_share
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post #60 of 60 (permalink) Old 04-29-2019, 06:29 PM
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I ordered the antivibration pads from Amazon. I bought 4 inch and they are about $12 to $15 for four. I will try to look up the part number and post it here.

My 20 gal is a Campbell-Haus unit. I have had it for over 15 years without any problems. The one you are looking at looks like it has a better air intake design which may help with noise also. It seems to put out plenty of air for a home system.

https://www.amazon.com/dp/B00BVEMLR4...p_mob_ap_share
Thanks Leo, I will definitely buy these. I want to minimize noise as much as possibly.

Found them on amazon.ca. Only four times as much lol
https://www.amazon.ca/Diversitech-MP...r=8-1-fkmrnull

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