Waterjet Overview

The REi Cut series™ integrates waterjet intensifiers into our sophisticated machinery. With water pressurized up to 90,000 psi and mixed with abrasive garnet, waterjets can cut many hard materials including steel and composites. Romeo Engineering waterjets are developed with open source software, so the customer is not limited to any software’s capabilities. We offer a series of cutting systems that make waterjet technology available in a low cost, easy to use machine-tool package.

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Frequently Asked Questions

The focusing tube needs to be replaced depending on your cutting quality requirements. The wear resistance of the Long-life Focusing Tube maintains an optimum jet pattern which results in better dimensional accuracy and cutting edge quality. To keep productivity at a certain level the bore diameter of focusing tube should not be worn out more than 30-50% of the original diameter, i.e. original: 0.30 inch –> maximum 0.43 inch.
Replacement Procedure

  1. Loosen the retainer knob
  2. Pull out the focusing tube
  3. Insert new focusing tube
  4. Hand tighten the retainer knob

If the abrasive/water stream reveals to be bad (“fanning jet”), the orifice needs to be replaced or cleaned with an ultra-sonic cleaning device.

Replacement Procedure

  1. Rotate the nozzle body for 1/8 turn to loosen the orifice from the nozzle tube seat. Use abrasive fitting as handle. The abrasive hose does not need to be removed.
  2. Rotate the removable cartridge for 1/4 turn. Use the locking knob as handle.
  3. Pull the removable cartridge out of the nozzle body. SLOWLY!!! Caution: The orifice loosely sits on the cartridge. Care is needed to prevent the orifice from “dropping out”. A little bit of high purity grease applied to the orifice seat can minimize that risk.
  4. Remove the orifice.
  5. Clean the outside of the cartridge of any abrasive particles.
  6. Put a new orifice on. Apply some high purity goop around the orifice mount where it seats on the cartridge. Failure to coat contact surfaces of orifice will result in damage to orifice and/or mating parts.
  7. Insert the cartridge into the nozzle body by aligning the retainer knob with the locating pin.
  8. Rotate the cartridge for 1/4 turn.
  9. Hand-tighten the nozzle body. Use the abrasive fitting as handle.

The Long-life Mixing Chamber (wear insert) needs to be changed, if the upper bore diameter has increased from 0.030 – 0.060 inch or the lower bore diameter has increased from 0.156 – 0.312 inch whichever occurs first, or if the cutting performance is not satisfactory to your requirements.

Replacement Procedure

  1. Loosen the set-screw by using an allen wrench.
  2. Loosen the retainer knob
  3. Remove both the focusing tube and the mixing chamber.
  4. Install the mixing chamber by aligning its side hole with the hole on the cartridge to assure proper abrasive flow into the mixing chamber.
  5. Tighten the set-screw to 24 in-lb max.
  6. Reinstall the focusing tube.
  7. Hand-tighten the retainer knob.
  8. Clean the outside of the cartridge of any abrasive particles.

  1. Worn needle or seat. Replace seat first.
  2. Replace packing. Try re-seating packing using 1/4″ poly tubing, forcing the packing up toward the Pneumatic ON/OFF Valve. If re-seating packing does not solve the problem, then remove old packing and replace with new packing.

  1. Check for leakage from the HP water valve when the valve is closed (dripping through the nozzle tube or even the focusing tube).
  2. Replace valve stem/seat if observing leakage.

  1. Hand-tighten the nozzle body a little bit more by using the abrasive fitting as a handle. If it still leaks, inspect the cone surface of the orifice mount and the nozzle tube for excessive deformation (“step”). Replace components with excessive deformation.
  2. Check the distance between nozzle tip and work piece “standoff”. As a rule of thumb, it should be at least 0.050″, especially for piercing operations.
  3. Check the focusing tube is not plugged. If yes, install the tube in the reversed direction and try to purge it using HP water.
  4. Check the orifice for fracture or absence.

  1. Inspect the orifice for damage. Any abrasive particles or metal chips can damage the orifice.
  2. Check the alignment. Shutting down the pump while keeping teh HP water valve ON will allow the formation of a fish-line-like stream for the alignment inspection.
  3. Replace the orifice with a pre-aligned orifice only, if damage or misalignment is observed.

Check the alignment. Replace the orifice with a pre-aligned orifice only if misalignment is observed.

  1. Check for a blockage in the abrasive line and funnel.
  2. Check for proper air pressure on the Bulk Abrasive Hopper. Air pressure should be approximately 35 psi.
  3. Check abrasive level in the Bulk Abrasive Hopper. The red stack light will be illuminated when the low level capacitive sensor is not made.
  4. Pull off the black cap on the rear of the abrasive body assembly. Ensure the abrasive transfer wheel is rotating. If the abrasive transfer wheel is not rotating, lower the abrasive feed rate (Lbs./min) and check again for proper rotation.
  5. Check the fuse on the incoming power of the stepper drive.

  1. Bad orifice. Replace orifice.
  2. Low incoming water flow.
  3. Low air pressure at Intensifier pump.

  1. Ensure proper air pressure at F-R-L. A minimum air pressure of 60 psi is required.
  2. All E-STOP pushbuttons are reset. Typical locations of E-STOP pushbuttons are the Operator Manual Control Panel and Hand Held Pendant.
  3. Ensure that no faults are present on the machine controller. Fault messages are displayed on the RE2000NT Waterjet Controller screen.

  1. While Homing and the “Z” axis never moves, check the “Z SPEED” adjustment knob.
  2. Check the “Z” axis primary and secondary fuses. If fuse(s) are bad, replace with equivalent.
  3. Speed Override is set to 0.
  4. Is the machine in PAUSE mode?
  5. Is the machine on a soft or hard travel limit? If so, the RE2000NT Waterjet Controller will display a fault message.
  6. Abrasive low level will place the RE2000NT Waterjet Controller in PAUSE mode.