Waterjet Cutting

How a WaterJet cutting machine works.

Water Jet Cutting EquipmentConditioned tap water is pressurized to approximately 45,000 psi through a variable speed direct drive/crankshaft pump. The pressurized water is then sent into a cutting head.  From the top of the cutting head, it exits in a controlled stream through a tiny opening called a jewel or orifice that is 0.010”/0.015” inches in diameter. 

water cutting headCustom Precision Technologies uses diamond orifices to withstand the enormous pressure.Beyond the orifice is a mixing tube where an abrasive (CPT uses garnet) is vacuum-fed via the venturi effect into the pressurized stream.  The water and garnet exit from the chamber via a nozzle at a velocity that can reach above 1000 feet per second creating an intense cutting stream.   For softer material the abrasive is not added to the mixing tube and the material is cut by water alone.

The material to be cut is placed on an elevated surface above the bed of the machine. Water is then raised to catch the exiting stream & disperse it into the water filled tank.

The cutting head controlled by state of the art CAD/CAM software moves along a programmed path, just above the material to be cut, which precisely creates the part or pattern.  CPT utilizes a cutting head that can lean or tilt, into or away from the starting stock to minimize taper on thick materials.
Even with all of this pressure, there is minimal force per square inch put onto the material, due to the small surface area of contact from the jet. This generates an extremely low cutting force, allowing thin or unusual profiles on delicate parts without inducing stresses that can cause distortion.
No noxious gases or liquids are used in waterjet cutting, and waterjets do not create hazardous byproducts or vapors. The used garnet can be recycled for another use and when fully spent can be safely placed into a landfill.

No heat effected zones or mechanical stresses are left on a waterjet cut surface.  It is truly a versatile, productive, and “green”, cold cutting process.