RE: [CAD_CAM_EDM_DRO] Re: Waterjet project - access to

we use a plasma for all thick steel plates, we only use the waterjet for
plastics, titanium, ceramics and glass, and in some cases we need to cut
composites. we need to do some pretty exotic stuff some times
----Dave L.

-----Original Message-----
From: turbulatordude [mailto:davemucha@...]
Sent: Monday, July 29, 2002 9:36 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: Waterjet project - access to


Hi Dave,

Thanks for the update.

Seems that one gallon a minute would be much less than any industrial
useage. It would also seem that re-uisng the water would be
exccdinly simple. after a short non-turbulent stint, all the heavy
stuff would fall out, a cyclone would pull most of the remaining
stuff and filters could easily handle anything under the size of what
is left. 60 gallons an hour is too simple, and you are correct the re-
cycling would be no only dooable, but in the home shop cost effective.

I would think that in a home shop, we could use magnets to pull
ferros metals, and possible some caustic solution to remove
aluminum. would have to think about that....

Dave

--- In CAD_CAM_EDM_DRO@y..., Dave Lantz <dlantz@a...> wrote:
> responses intermixed---Dave L.
>
> >>If you have access to one of these can you satisfy some curosity ?
> sure
>
>
> >What pressures do they run and why ? seems like pressure would
> >increase with thickness and or material and or speed. but is
there a
> >minimum ?
>
> I think the pressure intensifier here is about 50K psi, i can check
with the
> guys int he shop at some point
> pressure does change, but not that much, mostly you need to adapt
your
> cutting speed for the thickness, or you get a really ugly cut near
the
> bottom of the plate.
>
> >obviously the pressure would help determine pump size.
>
> not sure what the terminlogy really means, but all the docs call it
a
> preasure intensifier, not a pump, per-se...
>
>
> >Do they run a pump direct or pump and intensifier ? and what is
the
> maintenance schedule?
>
> oh, ok... see above, im guessing there is a pump somewhere...
probalby
> submersed in the well... (see below)
>
>
> >>this would also help to narrow down the best choice to achieve
that
> pressure.
>
> a little more info for you:
> the system runs an intensfier in the corner, with a long, semi-
flexible
> copper (or brass, not sure) tube. i remember one of the guys out
in ths hop
> saying that it is a very special tube, when it broke, we tried to
replace
> part of it with normal copper water hose, and it exploded, (noone
hurt
> luckily) it connects to the cutting head in a big parabola,
suspended from
> the ceiling. there is a preasure guage on the back wall, and when
it drops
> under a certain level, they ahve to shut the machine off and let
the pumps
> catch up, doesn't happen very much.
> another side note, we had to get a well to power this thing, and
the cutter
> ran the well dry last year, and we had to drill another!
> abrasive: we use garnet. we don'nt recycle it even though i think
that we
> should (not in control of that) it feets to the cutting heat
through another
> pump system, all VERY HEAVY duty!
> the nozzles are saphire, and last quite a while, but are very
expensive, you
> can tell when they go bad because you no longer get a focused
beam, just a
> cone.
> the table is a giant water tank, with metal slats over it like a
plasma
> table, it has 'rain gutters' on the sides, and drainage system.
ive got
> alot of ideas for a better system in regards to the table itself,
let me
> know what you think----dave L.


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