[TheForge] duplex and quadplex air compressors

[marc3rd]

I think gene Olsen from the sandbox (art metal list) has a rotary screw 
compressor. had it 5 - 6 years now

--------------------------------------------------
From: "Andrew Vida" <osan at netlabs.net>
Sent: Saturday, May 02, 2009 4:49 PM
To: "terry l. ridder" <terrylr at blauedonau.com>; "Blacksmithing List 
Sponsored by ABANA" <theforge at mailman.qth.net>
Subject: Re: [TheForge] duplex and quadplex air compressors

>
>
> terry l. ridder wrote:
>> there are the rotary screw air compressors to consider. less noise is
>> the main advantage that i have been able to find so far.
>
> There's more than that - screw compressors will pass higher volumes at
> higher pressures than piston compressors by a large margin, size for size.
>>
>> does anyone have a rotary screw air compressor? how does it compare to
>> the reciprocating air compressors?
>
> Far and away better.  Far and away more costly, in general.
>
> Another compressor you may want to look for are the double-acting
> piston-types.  If you can find one for scrap it may be worth taking -
> but these are usually quite large, produce prodigious volumes of air,
> are more trouble to maintain, and are probably a nightmare to have to
> repair.  Some look like a radial aircraft engine and are driven by a
> central crankshaft.  The pistons move air on both up- and down-strokes,
> hence the term "double acting".  A rod passes through the centers of
> each piston and one end attaches to an articulating connecting rod which
> in turn connects to the crankshaft.
>
> I only mention these because I always thought they were ultra-cool
> industrial technological art.  I'd love to have one just to look at. :)
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