Re: water jet

SNIP
Add up the force on the endcap of a cylinder with a 3" dia. piston and
an area of 7.0686" sq/in X 30K/psi (which has been outlined as the
minimum pressure required, 60K is the norm) would equal 212,058 pounds
of force or 106 tons.
Correct
SNIP

However
The calculation of force is correct but with out calculating the
energy behind the force missleading. The water / hydralics is just a
transfer mechanisim. If the presure is being provided to a vessel by a
.25" hand stroked ram even at 1000psi the energy is nothing worth
worrying about, a lot of force there but when a weld lets go, psst
zero presure. Which is exactly why I tested a coil boiler and piping
that way.
So the idea of a home water jet cutter is how to safely apply the
energy to the water. I've been speculating on a large diameter air bag
linked to a smaller diameter hydralic piston. The total energy is that
in the air bag. Having drilled some ugly materials recently a
presurize, jet hole, cnc to the next hole position has my curiousity
aroused.
Is there any volume of water/abrasive to material removal rates links
avaliable?
Cheers
Mark Stacey
www.cncprototyping.co.nz
PS
All the water jet cutters I've seen worked in air.