Re: [CAD_CAM_EDM_DRO] Re: PO BOY Water Jetter ????

Graham Stabler wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "robsarten" <robs@...> wrote:
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>>Maximator are a German company. They have an offshoot that produces
>>a commercial waterjet cutting system.
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>well that's a good sign! :)
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>>One of the pumps i did see had a outlet pressure rating of 65000 psi
>>and weighed 13kg with a flow rate of around .4litres/min
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>I wonder how much cutting you can do with a can of coke a minute :)
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>>Pretty impressive for a little pump.
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Probably a hell of a lot, like 1-2 IPM while cutting through 2" of
Inconel! We had a
demo of a Flow machine with a part like that. Our shop guys were
DROOLING watching
that Inconel dissapear. Of course, it goes a LOT faster in thin materials.

The trick, of course, is that the water doesn't do the cutting, it is
Garnet grit that is
sprinkled into the stream after it exits the high pressure nozzle. The
grit is accelerated
in the stream to 99% of the speed of sound in water, which is VERY high,
roughly 4500 FPS.

We were pretty serious about getting one of these machines, so we were
VERY interested
in maintenance. So, their tech opened up the pump, got out a pump
rebuild kit, and
showed us how the user-level overhaul was done. The particular machine
we were looking
at had a 3-cylinder pump, and each piston was something like 3/4"
diameter, or so it
appeared. These were some kind of cartridges, so the real piston
diameter may have
been much smaller.

Jon