Re: Aluminum cutting,,,,,,,

The explanation given at EASTEC was that the chips carry the majority
of the heat. The cooling capacity of air is a small fraction of that
of a liquid. (specific heat)
If the chips were not distorted, the heat would be equal, but because
the chips are deformed, they contain a lot more of the work (heat).
Therefore the purpose was to get the chips off the the part, so they
could not transfer the heat. Therefore vacuum chip removal was used
for the same purpose.

Buck

--- In CAD_CAM_EDM_DRO@y..., "Smoke" <gordonr@r...> wrote:
> High velocity air IS a coolant! In fact, if pressurized air is
blown thru a
> venturi the airs temperature will lower as it's volume expands.
>
> Your conclusions are acurate....IF there isn't much heat buildup no
coolant
> is required. Since there will normally be heat buildup on prolonged
> machining jobs, coolant (air, water, kereosene or whatever suits
you) will
> be required. Gets us blind people with experience really are
capable of
> leading the blind.
>
> Smoke
>
>
>
> >There is a lot of blind-leading the blind here, but that's the way
> >with most progress.
> >
> >The subject of coolant on aluminum is hotly debated around my area.
> >So a couple of weeks ago while attending EASTEC,(a large machinist
> >show near Boston, MA), just for fun I thought I would carry the
> >cooling question around, to the various vendors. I talked to dozens
> >fo manufactures of coolants and tools.
> >
> >MY CONCLUSION, (someone could have reached a different conclusion,
> >based on hearing the same information was):
> >
> >No coolant needed if there is 1) not much heat and 2) no trapped
> >chips.
> >~~~~~~~~~~~~~~~~~~~~
> >
> >Other related items:
> >-there were demonstrations of machining using high velocity air,
> >rather than coolant.
> >
> >-Vacuum of chips through 3/4" goose-neck hoses, right at the tool
> >were shown.
> >
> >- If you want to understand climb milling with aluminum, just try
it
> >both ways.
> >(Climb milling with steel has been dangerious for me too.)
> >
> >Buck
> >
> >
> >
> >
> >
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