Water cutting

Wow !

All I read was the initial comment that Henry Bawcum made, that he
had decided to go with a water jet. I didn't expect to see this
subject explode !

I would like to comment on my own previous words + a little more.

I was not thinking of just something small. I have seen something,
but with a much larger diameter. I was just thinking of something
small, DIY kind of stuff. I don't think you have to worry too much
about the water. You can keep the cutter some place outside of your
table, - just extend it with something .

As for the amplifier I made a drawing of, - I do know that this
principle have been used on systems with higher pressures than
50.000psi, because they had problems to make any plunger or piston
hold that pressure. In the system I indicated, - the water itself
is used as a kind of "piston".

The very first valve, is nothing more than a non-return valve. I
can find something more on the other valve, - but it is the water
that normally close this. But, you could use a rotating spindle with
a hole in it. This could be driven with a small motor. What I am
talking about, is nothing more than a head you would put on the end
of the pressure washer. Because of the non-return valve, the high
pressure will not be seen by the pressure washer, and the hose and
other stuff would remain the same. Someone mentioned an orifice of
ruby, sapphire, or something. Yes, - for a industrial type, running
24h a day, - you may need something like that, but not for a home
shop.

If I take some data from a pressure washer: 1500 psi, 8 litres/min.

( I am guessing here, but say the orifice is 0.1"=2.54mm) This
should give a velocity approx. to 26 m/s

You know the mass of water, and if you abrupt the water with this
velocity, - and you calculate the length of the bore, then it should
be possible to find out what kind of pressure you would be able to
get, together with the size of the new nozzle.

( this should be something similar to an electric current in a coil.
If you abrupt it, the voltage just sky rocket )

I was thinking of something stupid simple. If you are afraid of
water, then maybe use oil. I once worked with a fellow that
witnessed I guy losing three fingers. This was on a hydraulic system
with 1300Bar pressure. There was a leak the size of a needle, and
they could not see it. He told me the fingers just fell off.

As far as I can tell, several of you are familiar with water
cutters. Am very wrong about this idea ?

//ARNE