Re: [CAD_CAM_EDM_DRO] Re: Fire risk when wood routing

Hi Ray,

Probably just the opposite, I've seen some really spectacular fires in
cyclone dust collectors - they are the preferred means of dust collecting in
the grinding and buffing shops of the cutlery industry and factories often
had large cyclones outside which collected the detritus from both the
grinders and the buffers. So, you got a mix of cotton lint fibres and fine
steel dust/iron oxide. They would often spontaneously combust, sitting
simmering gently over a weekend, then, when the fans were switched on on
Monday morning sending a swirl of dust laden air into them - whooof, the lid
took off into orbit accompanied by a spectacular fireball!! I've also seen
firemen badly burnt and injured by trying to extinguish burning cyclones by
lifting the lid to squirt water in - as soon as the lid is lifted, air gets
in and the dust is disturbed and the whole lot explodes. The only way to
extinguish them safely is to pour water in gently through either the inlet
or vent hole without opening the thing up and disturbing the dust. The best
way to be safe is to empty your dust collector each day and dump the
contents on a pile away from the building. Timber works often had just such
a pile which was constantly smouldering and so never grew out of control.

Best wishes,
Ian
--

Ian W. Wright
Sheffield, UK


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----- Original Message -----
From: "Raymond Heckert" <jnr@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, September 01, 2002 2:43 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Fire risk when wood routing


> Would a little 'cyclone collector' help to keep the chips from
> compacting. A lot of fires are started by 'spontaneous combustion',
> due to compacted combustible materials.
>
> RayHex
>
> ----------
> > From: zeff1015@...
> >
> > Removing the dust is always a good idea, but doesn't really solve the
> problem
> > of starting the fire, just helping after it starts.
> >
> > Remeber a few tips to help keep fire from starting in the first
> place. Keep
> > your cutting tools very SHARP and CLEAN. The more pitch build-up on
> the
> > tools, the hotter they get. Minimize friction by keeping them sharp.
>
> > Remember to cut at an appropriate speed, too fast or too slow will
> generate
> > more heat as well. Also a good vacuum system will help cool the
> chips and
> > dust before it gets into the container where the fire would start.
> >
>
>
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