OPERATION | ||
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•Replace the nozzle when the orifice exit is eroded away or oval shaped.
•After the problem is found, or if there is nothing apparently wrong, reset the machine by turning the power switch OFF and then ON again. (It is possi- ble for electrical noise to trip the safety circuit on rare occasions. This should not be a regular occur- rence.)
•If the machine does not reset or continues to trip, consult the Troubleshooting Section.
•Use the proper cutting procedures referred to in Procedure Recommendations.
PILOT ARC DISCUSSION
The TOMAHAWK™ 625 has a smooth, continuous pilot arc. The pilot arc is only a means of transferring the arc to the workpiece for cutting. Repeated pilot arc starts, in rapid succession, is not recommended as these starts will generally reduce consumable life. Occasionally, the pilot arc may sputter or start inter- mittently. This is aggravated when the consumables are worn or the air pressure is too high. Always keep in mind that the pilot arc is designed to transfer the arc to the workpiece and not for numerous starts without cutting.
The TOMAHAWK™ 625 does not utilize high frequen- cy starting. When the pilot arc is started, a slight impulse will be felt in the torch handle. This occur- rence is normal and is the mechanism which starts the plasma arc. This impulse can also be used to help troubleshoot a "no start" condition.
PROCEDURE RECOMMENDATIONS
When properly used, plasma arc cutting is a very eco- nomical process. Improper use will result in a very high operating cost.
General - In All Cases
•Follow safety precautions as printed throughout this operating manual and on the machine.
•If piercing is required, slowly lower the torch at an angle of about 30° to blow the dross away from the torch tip and slowly rotate the torch to a ver- tical position as the arc becomes deeper. This process will blow a lot of molten metal and dross. Be careful! Blow the dross away from the torch, the operator and any flammable objects.
•The nozzle should not be dragged on the metal surface. A drag spacer is provided to maintain a consistant touch height. Refer to Touch Parts Configurations in this Section.
Torch Standoff |
DRAG1/16”thruStandoff1/16" |
Standoff |
•Where possible, start the cut from the edge of the work piece.
•Keep moving! A steady speed is necessary. Do not pause.
TOMAHAWK™ 625