Maintenance
OMAX JetMachining® Center Operator’s Guide
400433D-EN
4 - 51
Abrasivejet Not Piercing Material
Condition and Possible Causes
Corrective Action
Setup values entered in Make are not
consistent with the actual physical
requirements.
Check that the material setup values for the following parameters are
correctly set in Make:
• Machinability —
Thickness
Click on
Setup
in Make, choose
Pump and Nozzle settings
, and verify
that values for the following parameters are set correctly:
• Water pressure
• Orifice diameter
• Mixing tube diameter
• Abrasive flow rate
An abrasive other than the
recommended garnet is being used.
Many abrasives do not cut as well as garnet, and the machinability should
be reduced when using these abrasives. It may be necessary to
experiment to determine the best settings.
Garnet is recommended because it allows a good cutting rate with
relatively low mixing tube wear. Garnet is also nonhazardous and, as such,
is easily disposed. Other abrasives may increase mixing tube wear and
may be a disposal hazard.
WARNING!
Never use silica sand as a cutting abrasive. Fine silica
dust produced by the cutting process can lead to
silicosis, a serious lung disease.
The standoff between the abrasivejet
nozzle and the material being cut is
too high.
The standoff should be no more than 0.050" (1.3 mm) for best results.
Note:
In Make, under Motion Preferences, it is possible to set the
pierce height to be different from the cutting height if you have a
motorized Z-axis. To help reduce nozzle plugging, consider
setting the pierce height higher than the cutting height.
The abrasive flow is stopped or has
been reduced by the presence of dirt
or wet abrasive.
Disassemble the plugged items, blowing them clean and dry with an air
hose.
WARNING!
Never point the air stream at anyone during the
cleaning process. Always wear eye protection!
The mixing tube has worn excessively
and is unable to form a perfect jet.
Mixing tube wear occurs first at the inlet, then a conical wear zone grows
toward the exit end of the mixing tube. Check the tube bore at both ends
using a drill or gage pin. When the outlet diameter has increased by 0.005"
(0.13 mm), the mixing tube is near the end of its useful life for precise
cutting.
The jewel that forms the jet is
chipped, dirty or out of tolerance.
Replace the jewel and the jewel holder.
The pump is not delivering the
pressure specified.
Measure the pressure to see if it is below specification.
Follow the pump troubleshooting procedures.
Abrasivejet Quit Cutting
Condition and Possible Causes
Corrective Action
The abrasive flow is stopped or has
been reduced by the presence of dirt
or wet abrasive.
Disassemble the plugged items, blowing them clean and dry with an air
hose.
WARNING!
Never point the air stream at anyone during the
cleaning process. Always wear eye protection!
Summary of Contents for JetMachining Center 2626
Page 8: ...OMAX JetMachining Center Operator s Guide viii 400433D EN ...
Page 12: ...OMAX JetMachining Center Operator s Guide xii 400433D EN ...
Page 22: ...OMAX JetMachining Center Operator s Guide Safety First 1 10 400433D EN ...
Page 140: ...OMAX JetMachining Center Operator s Guide OMAX Glossary 6 16 400433D EN ...
Page 144: ...OMAX JetMachining Center Operator s Guide Index 4 400433D EN ...