45.Thompson Submachine gun

Hello again ,

You would be able to cut with a "45.Thompson Submachine gun" - If
you just could keep it steady ! :-)

You often have the same thing with milling, sawing - or better - a
nibbler. If you get a pulsed water flow, I don't see that it would
matter, as long as you can "keep it steady". Something EMC will do
for you.

Okay, the design drawing I posted, has some flaws, or it need some
refinements, but it has been very interesting to hear your comments
about it. I just wish I had a "impulse" pump drawing to study. But
Jon came up with something interesting: could you use a fuel
injector from a truck ?

Several things spring to mind, - but for the moment I just want to
ask about one thing:

A fuel injector, will make a spray - but one would want a
directional and fine flow. I believe you would have to rework the
orifice or nozzle. So how could this be done ? If you had a thin
wire, and tried to make a thin bore in a block of suitable material
with EDM, could it be done ? Or would the spark fly from the wire
to the wall, instead of - from the tip, to the bottom ?

Another thing, - Roland Friestad ( sounds like a scandinavian
surname ) came with a lot of nice information. But he said the
velocity was close to Mach 3 ? !!! I have probably been a little
stupid. I have been thinking too much about the pressure, but now I
believe the velocity is the "cutting" force. It is the mass
momentum. Is this correct ?

Another thing, is it possible to find a drawing or exploded view of
such a nozzle. He said that the nozzle material was sapphire, -
and it cost approx. $25. That is not much, - if you could use
something ready made. Or what ?

A 35 hp motor !!? Is this because you really need the high
velocity flow / pressure ?

If you think about the "machine gun" analogy - it could work with
a small motor, if pulsed ?

//ARNE