Re: [CAD_CAM_EDM_DRO] Re: Any "Best Practice" Recommendations for clearing chips and feed/speed when

Hi, I am not a chemist however, i agree with this reply. the problem comes
when swarf is of a mixed metal composition. a circuit board manufacturer in
the town my brother is the Deputy Fire Chief had several explosion/fires
resulting from mixed metals. The circuit boards they make are copper,
aluminum, titanium, various plating metals, and coatings. there are several
grinding and polishing stages during manufacture and all swarf went into one
dust system. Hence the problem of mixed metals with a tendancy to self
ignite or be a powerful explosive waiting for an ignition source. separate
swarf and dispose of quanities while small!!!!! Be safe! cul Brian f.

----- Original Message -----
From: capteod <mfgguru@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, December 23, 2001 3:01 PM
Subject: [CAD_CAM_EDM_DRO] Re: Any "Best Practice" Recommendations for
clearing chips and feed/speed when


> In your recent post I noted your claim that THERMITE was known for
> self ignition. This is WRONG. Thermite requires a ignition source
> in excess of 1400 degrees. When it starts burning it will generate
> temperatures of 6700 degrees F.
>
> The problem many people in the metal working industry have had is
> grinding swarf which contains both aluninum oxide and steel or
> ferrous oxides, that thas dried and were ignited by heat generated
> when maching without coolant.
>
> This is a major problem. We were aerospace parts manufacturers and
> have a lot of experience in this area. We have experimented to
> ignite thermite in our scrap area and we needed either an oxy-
> acetelyne torch, burning magnisium or an arc welding bachine. The
> military uses an ignition train of magnesium oxide mixed with a
> nitrocellulose binder in its THERMITE grenades. These are used for
> the destruction of metal parts in the case you want to destroy items.
>
>
>
>
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