[TheForge] pneumatic tools and pneumatic tool oil

[Bruce .]

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.

>
> The next question that popped into my mind, when the exhaust from the
> pneumatic impact tool was becoming ice cold. what is the possibility of
> ice forming inside the pneumatic tool? I would assume extremely low.
>

​What would freeze?  In principal, any liquid can freeze.  Look up the
freezing point of your fluid.

This question is complicated by the possibility of "clathrate hydrates" (
https://en.wikipedia.org/wiki/Clathrate_hydrate ), which can exist at low
temperatures.  I seriously doubt this would be a problem in a hydraulic
system, but I don't know enough about the subject to be sure.​

>
> could the chilling effect on the air exhaust causes me to think that a
> simple device could be made that would produce a cold air exhaust to be
> used to cool drill bitx and lathe bits. the old PVT relationship.
> Pressure volume temperature.
>
> ​Yup!  Well known.
https://www.youtube.com/watch?annotation_id=annotation_2785371047&feature=iv&src_vid=L7U2CbxfMMk&v=tLNHDxd6nDc
​

> turns out French physicist Georges Ranque discovered the vortex tube in
> 1930.interesting device. why is it not in use today?
>

​They are in use.
http://www.exair.com/en-US/Primary%20Navigation/Products/Vortex%20Tubes%20and%20Spot%20Cooling/Pages/Vortex%20Tubes%20and%20Spot%20Cooling%20Home.aspx
Seems to me I just read of a use in machining -- turning, I think -- for
spot-cooling.  Downside:  Requires a big air compressor, and ALSO produces
a hot-air stream.  TANSTAAFL.​


>
> --
> terry l. ridder ><>
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