[TheForge] pneumatic tools and pneumatic tool oil

[Craig S]

Correct.  And there is 'partial' combustion sometimes.   Similar to not 
wanting to breathe air from an ordinary compressor with an oil crankcase 
because it may contain CO from the oil getting past the rings.   Just not 
the right mixture for 'real' combustion.

-----Original Message----- 
From: Jeff Wilson
Sent: Friday, July 22, 2016 2:34 PM
To: Blacksmithing List Sponsored by ABANA
Subject: Re: [TheForge] pneumatic tools and pneumatic tool oil

The replies I'm seeing here are addressing hydraulic systems, where as the
question was regards pnumatic systems.  What am I missing?
Jeff
A misty rainy day in the northwest.

"What appears to be coming at you is coming from you." -Jack Flanders

On Jul 22, 2016 2:29 PM, "Harry Wise" <hlwise at me.com> wrote:

> Compression is not a side issue in diesel engine as I understand it.
> Adiabatic compression is the ignition mechanism. When a gas is compressed
> it gets hotter. If that temperature exceeds the autoignition temperatures
> the fuel/air mix then you get combustion. Of course in a hydraulic system
> you have liquids which do not really compress so you do not get the heat
> build up. And like you said Bruce, there is no oxidizer in the hydronic
> system. Lets hope there is not anyway.
>
> Harry Wise
> Huntsville AL
>
>
> > On Jul 22, 2016, at 7:37 AM, Bruce . <freemab222 at gmail.com> wrote:
> >
> > See my responses inserted below.
> >
> > Bruce
> > NJ
> >
> > On Thu, Jul 21, 2016 at 11:22 PM, terry l. ridder <
> terrylr at blauedonau.com>
> > wrote:
> >
> >> hello
> >>
> >> while working on the truck with the impact tool, a question popped into
> >> my mind. Wh
> >> ​y does not the oil in an pneumatic tool, "diesel", i.e.
> >> combust. there is compression and there is oil. I use mineral oil so I
> >> am not entirely sure what conditions would have to be for mineral oil 
> >> to
> >> "diesel". I would not want to try diesel fuel or keresine.
> >>
> >
> > ​Because you don't have a proper fuel-to-air ratio to support 
> > combustion.
> > There would be little or no air> 
> >  >
> > ​inside a hydraulic system, as air bubbles would defeat the purpose.
> Also,
> > it's unlikely there'd be a source of ignition in any event.
> >
> > Compression is a side issue.  Compression is no​t inherently needed to
> > support combustion.  It's needed to support engine operation, and, in a
> > Diesel engine, forms part of the ignition process.  It also may change
> the
> > ignition characteristics of a given fuel-to-air mix, but that's also a
> side
> > issue w/ Re: hydraulic systems.
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