DetachedGarage
Well-known member
Has anyone actually purchased the Eastwood QST compressor and hand any experience with it? I can't find anyone that actually owns one to give an honest opinion.
Quiet Compressor? Oxymoron?
- Thread starter Dentaltec
- Start date
Michigan Mike
Well-known member
Off the wall and outa the box. I have never heard the compressor in my dentist's office. Is there any chance you can get an older one out of a remodel. Probably nowhere near the capacity you want but I just thought your job being in a dentist office you might have connections to other offices. Just a thought.
Dentist don't need much air/pressure to run.
plus the compressor is hidden in a sound proofed room most of the time.
My dad sell construction air tool for 30 years, and we once had a dentist as a client. the whole cabinet was run out of a thomas twin piston (pair of them for redundency) and it was way enough air for the 6-8 chair in the cabinet.
after a couples of year we just stopped because maintenance was getting ridiculous........compressor made for dentist are way better.
All that to say that dentist don't need much air. (nor pressure) as compare to air tools in a shop.
Any scroll compressor (Eastwood is somewhat a reputable compagny) will be way quieter than any piston type ones.
DetachedGarage
Well-known member
Glad that there are a few happy owners out there. I must not have done a very good job searching. Sorry about that. I was hoping for some more feedback beyond the normal "I like it" or "It is quiet".
Looking for more on the below:
How do you like yours? Ever had any issues with it? What is your normal usage with it? Do you have it mobile or permanently mounted? Have you had a Piston style in the past, and do you like this better (Why or why not?) What type of tools are you running?
Kaizen
Well-known member
Glad that there are a few happy owners out there. I must not have done a very good job searching. Sorry about that. I was hoping for some more feedback beyond the normal "I like it" or "It is quiet".
Looking for more on the below:
How do you like yours? Ever had any issues with it? What is your normal usage with it? Do you have it mobile or permanently mounted? Have you had a Piston style in the past, and do you like this better (Why or why not?) What type of tools are you running?
I disregarded it immediately as it has 13cfm for the price of a 20something cfm 5hp one. Not even sure if they have a high psi
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nadogail
Well-known member
My former neighbor had a GAST compressor, after 30 years all I remember about it was it was quiet, small, and attractive as well as USA made.
johnnyradiant
Well-known member
If 60 dBA is too loud is conversation only allowed at whisper levels. Current charts are ******* 60 dBA at a conversation level. I thought it was more like 55 dBA but when I double checked it is listed at 60 dBA. A lot of car manufactures started bragging (marketing) about how quiet their cars were inside while driving when they could get them below 60 dBA.
Years ago I got a Quincy and put it a top of a 120 gal vertical tank (my boss at the time suggested upsizing the tank) and put it on rubber motor mounts. It's got a nice low thump instead of a loud cacophony of noise. The motor mounts have a separate studs, one up and one down, so the compressor is completely isolated by rubber. I'd guess it is over 60dBA but it doesn't seem too loud when it is running, and I can't think of an air tool that doesn't blare over the compressor. Isolation with GOOD airflow will make a huge difference. Just use some thought in 'plumbing' the air so that it too can be done in a way to also dampen noise.
Years ago I got a Quincy and put it a top of a 120 gal vertical tank (my boss at the time suggested upsizing the tank) and put it on rubber motor mounts. It's got a nice low thump instead of a loud cacophony of noise. The motor mounts have a separate studs, one up and one down, so the compressor is completely isolated by rubber. I'd guess it is over 60dBA but it doesn't seem too loud when it is running, and I can't think of an air tool that doesn't blare over the compressor. Isolation with GOOD airflow will make a huge difference. Just use some thought in 'plumbing' the air so that it too can be done in a way to also dampen noise.
lonejacklarry
Well-known member
Do the advertised "silencer" air cleaners work at all? The name brand is Solberg but it doesn't look any differently than the standard air cleaner on my Ingersol Rand.
I have one and it lowered the noise substantially
Intake design can help a lot. On my 120V belt drive compressor going from no intake to "automotive style" + rubber hose resulted in almost 10db drop. It's not as quiet as my CAT compressor but not unpleasant to be around in a small garage.
lonejacklarry
Well-known member
Thanks for the advice and recommendations. I am thinking a straight in type of manifold would be quieter than one with a 90 in it.
I know 90's in plumbing make a lot of noise so I'm wondering if the same would be true for air.
Thanks, again!
redmondjp
Well-known member
No, a 90 degree won't really make much difference. If you really want to make it quiet but don't want to spend $ for a silencer, use a rubber hose to isolate the pump from the rest of the intake piping (so it doesn't transmit the pump vibration to the structure that the pipe is attached to), and then run the intake pipe away from the work area. This is commonly known as a remote intake, and it works very well.
lonejacklarry
Well-known member
I'll give that method a try. Thanks very much!
trbomax
Well-known member
I have 2 reciprocating compressors. My "main" unit is an Ingersol/Rand type 30 (v-type)running at 750 rpm with 7.5 hp.It is not real quiet, but if I am more than 15' or so from it, normal conversation is possible.It is a very old,1936 unit, all cast iron with disk valves.The compressor unit has never been rebuilt, or even apart.I can verify that because I took it out of my dads machine shop when he passed in 1980,and he always told me he bought it new.My secondary unit is a Saylor/Beall,vertical twin running at 730rpm with a 7.5 hp motorI dont know any history since i bought it at an auction 10 yrs ago.It is much quieter than the I/R.I did equip it with Solberg silencersand I can stand next to it and speak normally.You do feel the "thump" in the floor though!They are both on 80 gal receivers and are Staged so that the I/Rshuts down at 160psi and starts at 0psi The S/B starts at 120psi and is off at160psi The reason for the two pumps is that they are both running about 17 -18 cfm @ 120 psi and my sand blaster needs 24cfm @120 to function properly.The motor starters are wired separately so I have the option of running 1,2 or 1 and 2,depending on my needs.
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For what it's worth, my compressor has a filter like this attached to the side of the pump (no extensions)
I slipped about 14” of clear vinyl tube onto the end. The result was impressively effective. The hose really makes a difference. I got the idea from my CAT compressor. They do the same thing from the factory.
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Tracs
Well-known member
For what it's worth, my compressor has a filter like this attached to the side of the pump (no extensions)
I slipped about 14” of cost vinyl tube onto the end. The result was impressively effective. The hose really makes a difference. I got the idea from my CAT compressor. They do the same thing from the factory.
I just did this too. But after I was wondering if the compressor can take in enough air while compressing through a small tube?
In my case the tube went on the outside of the snout vs inside. While it make the intake longer it didn't reduce the diameter. The setup my CAT compressor uses does reduce the diameter as the tube goes inside of the intake opening.
This guy did something similar with a large compressor though I think he ran those tubes into a car muffler
rburke65
Well-known member
My Champion, ....TP Tool, 5hp, 2 stage, 60 gal., ..I think it’s 806 rpm...very quite. You can stand next to it while running and have a conversation.
lonejacklarry
Well-known member
Well, I did try the Solberg silencer. A little plumbing and it was done. Interesting numbers below:
Standing 6' from the compressor running:
1. No filter or silencer 88.6 decibels
2. Stock filter 86.1 "
3. Solberg silencer 81.5 "
I never understood how the decibel thing worked but the compressor is appreciably quieter. The arithmetic looks like 10% but I know it does not work like that. I may play with the plastic tube idea when I get around to it.
Standing 6' from the compressor running:
1. No filter or silencer 88.6 decibels
2. Stock filter 86.1 "
3. Solberg silencer 81.5 "
I never understood how the decibel thing worked but the compressor is appreciably quieter. The arithmetic looks like 10% but I know it does not work like that. I may play with the plastic tube idea when I get around to it.
Monza Harry
Well-known member
If you use a hose remember to upsize to reduce the restriction. A smooth bore hose shouldn't reduce the noise as much as a corrugated hose, but that will introduce another restriction so another upsize would be in order and less noise reduction with each of those. Maybe the best plan is to put the intake into an area that isn't in direct ear shot [behind a machine/cabinet etc.] Harry …. Each 10dB is an increase of 2x the volume, (10xthe power)
https://www.noisehelp.com/decibel-scale.html
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This is the sort of thing that is heavily affected by the intake muffler setup. It can make a huge difference.