Re: PC dust issues

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Les Newell <lesnewell@f...>
wrote:

> I would disagree with this. The fans should be pushing air into the
> cabinet not drawing it out. You want a positive pressure in the

cabinet

> otherwise dust will be drawn in through mounting holes, cable

exits,

> panel joins etc. This is why many filters have mountings that are
> compatible with fan mounting holes.
>
> Les

Two schools of thought, Blowing air in assures you that you are
getting outside air to cool with.
sucking air out assures you that you are removing hot air.

Regardless of how you do it, particulate removal is best done at the
source where concentratons are highest and efficiencies of removal
are greatest.

Point of source, or point of generation is best. There are a few
ways to connect a vacuume to a router and not have it get in the way.

Also particulate removal works best in stages. The big stuff with
gravity if possible, the floating dust with very low air velocity
(small fan, larger chamber)

Shop vac's use a vortex to let the larger stuff spin out of the air
stream, and long stringy stuff to swirl around the center and then a
filter to catch the very light stuff. The larger the container and
the slower the swirl, the smaller particles it will catch.

Also, if you have the space, a large wooden frame with some bed
sheets attached could be the final, very low velocity filter section.

Dave
If a cluttered shop is the sign of a cluttered mind..
what is and empty shop the sign of ?


ps: I'm going to have to check with Bill and Tim on this being OT.
It is VERY closly related to building a home machine, and although
not directly to the CNC nature, it falls extreemly short of machine
use or commercial......

That said, considder this on a very short leash and keep it as on-
topic as you can.

Any responses on-list if this being on-or-off topic WILL have this
end instantly.