- Australia Advice time, compressors
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Member
Re: Advice time, compressors
Hi dharmic
new Hush-100 compressor. . . What I'll remember is that this thing is quiet and fast. 100l tank filled in well under a minute and about 20dB-A at one metre
Details, PLEASE.
Supplier, city, price, attached fittings (regulator, filter, etc) if relevant, what sort of air line connector?
Mine is B****Y noisy and old.
Cheers
Roger
Sydney
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Member
Re: Advice time, compressors
Screw compressors have to scream in revs. Maintenance - yeah.
What puzzles me is that the Hush 70 and Hush 150 are rated at 70 db noise, while the Hush 100 is rated at 50 db. One has to wonder. Only thing to do I think would be to actually go and look at one in operation (or listen).
Cheers
Roger
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Member
Re: Advice time, compressors
This is the doubt I had - they quote 50dB but not dB-A or at what distance. Anyway...
In a shed (you have to factor reverberation and so on) I measured off 80dBa at 1m where my old two pot direct was a whopping 98. Still not 50, but with a 50dB ambient it's pretty good for what it's shuffling out. And that's with all three motors running - cut it down to one motor and it's significantly quieter again.
If you can go in, that's the ticket. A little difficult from Perth.
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Member
Re: Advice time, compressors
Yeah, reverb doesn't help, but what really annoyed my wife was when the compressor drifted up against the gal wall of the workshop and shook the whole wall. Apparently it was much louder from the outside. Me, I was wearing ear muffs ...
Hum ... $1.2k ...
Cheers
Roger
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Member
Re: Advice time, compressors
It's also the quality of the sound: this thing purrs rather than brain raping clatter of a normal compressor. So it seems quieter than it is.
Yep, not cheap. But I figure it's got maybe 1.5x the capacity of my old 3hp machine and, in a year, I'll have forgotten what it cost.
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Member
Re: Advice time, compressors
Clatter - yeah. Cause for thought.
Is it OK cycling on and off?
Cheers
Roger
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Member
Re: Advice time, compressors
Each pump has a separate blowoff solenoid and check valve so they're not fighting reservoir pressure to start up. Seem pretty happy kicking in and out.
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Member
Re: Advice time, compressors
Makes sense of course, but still nice.
Also makes it easy to temporarily switch one pump out.
Hum ...
Cheers & thanks
Roger
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Member
Re: Advice time, compressors
Hum is exactly where I was a month ago.
Then started listening and measuring compressors in shops, coming home to use (and increasingly hate) mine.
One day I just reached the "fnck it" point.
You may too - but if you can then definitely go have a look/listen first. You may find the 70 is ample.
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Registered
Re: Advice time, compressors
I bought an old Coldstream compressor from the Logan dump shop for about $40. It has a 1hp electric motor belt-driving a single cylinder compressor. The tank was too big and HEAVY to even move around easily - so I rebuilt the whole thing on a 40 litre tank I got for free. For about $17 I got a pressure switch unit from ebay that goes from about 50 (low) to 70 (high) psi. I bought a copper pipe bending and flanging kit from ebay for about $22 and bent some used copper pipe as required. I bought a tube of Bondlock Pipe Seal which anaerobically cures when in contact with metal ( and threaded parts can be removed with hot air gun)-- for about $23. I made up a safety guard around the belt and pulleys and added a $17 ebay regulator and used the old pressure gauge on the tank. I got a new lawn mower air filter from bunnings for about $12. When it is in use I point a pedestal fan at it for extra cooling.
I have this now outside my shed because it is quieter that way. The sound level is about the same as the noisiest part of a (quiet) washing machine's cycle. You can have a quiet conversation right next to it.
While it is limited in pressure and capacity, it is enough for most of my needs.
I also have a noisy 2HP direct drive compressor that I got from SuperCheap Auto for about $100. When I get it working again. There is a brass non-return valve on this compressor which is a real HAZZARD as the brass cap has a tendency to get blasted off by the pressure when you least expect it. The cap has the weight of a bullet and after being blasted off by 100 psi it is a real danger. This has happened twice now and I have got a replacement from ebay but this time I will be wiring some chicken wire around it.
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Member
Re: Advice time, compressors
Gosh.
Just spent a day sharing a shed with the new machine. It's not going to take many more days like today for me to forget the pain in my hip pocket and focus on the joy of brain space.
Occasionally it fired up and ran for a while. Sounded like someone running a four stroke lawnmower a couple of blocks away. Wow.
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Member
Re: Advice time, compressors
Hey dharmic - you trying to rub it in?
Roger
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Member
Re: Advice time, compressors
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Member
Re: Advice time, compressors
Hi.......the noise factor is a real problem with compressors........the solution a friend did was to run his oldish twin cylinder compressor at half speed by adjusting the pulley sizes and couple a second air receiver tank to it.........provided the consumption doesn't exceed the supply, the volume of 2 X 100 litre tanks makes up for the supply by allowing for the on off usage.
A lot of the noise can be traced to the discharge valve making a high speed burping noise and this is the main noise creator.
BTW......a 2 litre car engine at tick over or 1000 rpm, is hardly noticeable even standing next to it........being an internal combustion machine the muffler does all the sound deadening work and that is from an explosion in each cylinder.......perhaps a compressor can be quieter if the discharge is muffled more efficiently.
Now, if I were to be using a lot of air all the time, I'd think about utilising a defunct 4 cylinder engine as a compressor and drive it slowly with a 2 HP electric motor and a big air receiver or two....whatever.... instead of at some insane speed that only generates lots of noise.
Perhaps the ready made solution is the sane way to go.
Ian.
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Member
Re: Advice time, compressors
Ian's proposed solution actually sounds rather like dharmic's Hush 100 unit - 3 cylinders rather than 4.
Cheers
Roger
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Member
Re: Advice time, compressors
Under-rate everything. What a novel approach today!
Cheers
Roger
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Member
Re: Advice time, compressors
Hi....I quite agree.....dodging up a compressor arrangement is not a 5 minute job.
Some time back in the 80's a chap at our model club built a hobby compressor using a small 125cc 4 stroke single cyl vertical engine driven by a 1/4 HP electric motor.......it's the type like a Briggs and Stratton lawn mower engine, except it's in a vertical mode.
A new head was made from a piece of aluminium plate with two steel ball valves and the original valves (on the side) and camshaft were removed.
I bought it later at the club auction after he passed away........it pumps up to 80 PSI but has low output volume....it's also very quiet........I intend to mount it on a 50 litre compressor tank that I bought at another auction (sans motor and pump) to increase the storage capacity......one of those projects stacked in the must do box......cost was about $50 plus $5 for the compressor tank, and plus another $15 or so for the regulator valve.
I already have a hobby compressor I bought from Supercheap autos, but it can waken the dead when cycling on, so the other project one is starting to look good.
Ian.
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Member
Re: Advice time, compressors
There was one substantial thing I did to quieten my Comp and that was to remove those ridiculous foam filters on the Intake and put silencers on them best thing ever .
- Australia Advice time, compressors
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