Cutting Process - Lincoln Electric Tomahawk 1000 Operator's Manual

TOMAHAWK ® 1000
7. PRIMARY AIR, GAS PRESSURE GAUGE AND
REGULATOR KNOB:
Allows the regulation and monitoring of the
primary air/gas pressure.
The inlet primary air/gas pressure is limited by
this pressure regulator, set at the factory to 80
PSI (5.5 bar). To adjust the air/gas pressure,
place the machine in Purge mode.
8. CUTTING OPERATING MODE SELECTION: Press the
pushbutton to select the desired operating mode (the LED
indicates the selected mode):
• CUT (Upper LED): for cutting or
piercing operations on a solid work
piece.
• GRID (Middle LED): for cutting
operations on a grid work piece.
• GOUGE (Lower LED): for removing material from a solid work
piece (removing a weld).
The Operating Mode can only be changed with the machine at
idle or during Purge or Post Flow times.
Pressing the pushbutton during Pilot Arc or Cutting will have no
effect.
Items 9 thru 12 on the back of the Tomahawk
1000 (See Figure B.3)
9. FAN: Provides machine cooling. When the machine is
switched ON, the fan runs continuously.
10. POWER SWITCH: Turns ON / OFF the input power to the
machine.
11. INPUT CABLE: Connects unit to the input power.
12. AIR OR GAS INLET: Compressed Air or Gas Connection.
FIGURE B.3
10
11
Clean, dry air or gas must be supplied to the machine. A
pressure setting above 110 PSI (7.5 bar) could damage the
torch. Failure to observe these precautions could result in
excessive operating temperatures or damage to the torch.
1MPa = 145 psi

CUTTING PROCESS

The air plasma cutting process uses air or nitrogen as a cutting
gas and to cool the torch.
The pilot arc is initiated as follows: The torch trigger energizes a
solenoid valve. This valve enables the gas to flow during the
cutting and post-flow stages.
The Tomahawk
independent of the plasma arc length.
When preparing to operate, make sure you have all materials
needed to complete the job and have taken all safety precautions.
Install the machine as instructed in this manual and remember to
attach the work clamp to the work piece.
• With the machine switched OFF, prepare the torch with the
consumables adequate to the desired process (CUT / GRID /
GOUGE). Refer to the consumable Charts on pages B-9, B-
10.
• Connect the Torch and the work cable to the machine.
®
• Turn ON the Power Switch on the back of the machine; the
Input Power LED on the front panel will illuminate. The unit is
now ready to operate.
• Verify correct gas pressure using the Gas Purge function.
• Select the desired process using Operating Mode pushbutton.
• Set the desired cutting current using the Output Current knob.
To start the selected process pull the torch trigger, making sure
you are not aiming the torch in an unsafe manner.
Once the process is completed releasing the torch trigger will
cause the plasma arc to turn off. The gas flow will continue,
allowing the torch to cool.
12
9
B-5
WARNING
®
1000 provides constant current at the set value,
OPERATION