Re: [CAD_CAM_EDM_DRO] Re: water jet

Im not sure what you mean by "clipping" the message. Explain and I will do it. I havent seen any flowrates for the jet calculated which would give a rough idea of the cut duration. I'm thinking it would be less than a minute. A one minute cut cycle would be hardly enough time to do anything. Imagine trying to cut a large radius and having program interupts . The programming would be unorthodox to say the least. Another thing that would have to be taken into consideration is the volume of the cylinder. When the water is compressed within and reaches a pressure suitable to perform a task I would think the volume would be considerable less. A portion of the stroke and internal volume would be lost compressing the water. Seems the need for a multistage series of cylinders would be required to over come this. Starting with a large cylinder then tranferring to a smaller diameter cylinder progressively until the desired pressure is attained. Now I'm talking about a pump.

Hey, why doesnt someone just do that? Design and build a multi-stage pump. Use a block of stainless and incorporate shelf items common with pressure sprayers, ceramic pistons etc. Have the intake fed with a pressure sprayer pump, getting a 1500 psi gain right from the start. Could be 4 single acting cylinders machined from one block and leave it massive, with one way checks in between. Crankshaft and connecting rods could be replaced by linear bearing supported plungers attached to ceramic pistons and a camshaft to actuate 0-180-0-180. A stroke of 1" or less would be sufficient. The last cylinder could probably be as small is 1/2" in diameter. Still need a bunch of horsepower.


This would be alot smoother operating than trying to attain all the pressure in one stroke. This might be the principle already in use for waterjets. This might even reduce the required horsepower.

Ron






raig <docsys@...> wrote:

A better alternative to your design would be: Two water cylinders in
parallel that work in opposite of one another to supply a constant flow
to the jet and switched/valved at the nozzle.

This then becomes way too complicated, it needs to be simple to reduce
the cost. Think real simple terms here, like a super-soaker water play
toy gun. You have
a set pressure for s set time limit.

>
>
>Developing and storing dangerous levels of pressure/energy in a large vessel was largely the death of the steam engine on a widescale. Expensive, Inefficient and unsafe.
>
>

Doesn't the internal combustion engine develop dangerous levels of energy?

Bruce

PS:
Could you clip your message next time?



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