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B-6
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 vertical 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 may be dragged on the metal sur-
face, touching it lightly to the surface. NOTE:
The use of a drag cup with the PRO-CUT is
not recommended. The increased standoff
distance reduces the overall performance of
the PRO-CUT.
Torch Standoff
DRAG thru 1/16"
DRAG thru 1/16"
Standoff
Standoff
• Where possible, start the cut from the edge of
the work piece.
• Keep moving! A steady speed is necessary.
Do not pause.
Suggestions for Extra Utility from the
PRO-CUT System:
WARNING
ELECTRIC SHOCK CAN KILL.
• Turn off machine at the disconnect
switch on the front of the machine
before tightening, cleaning or replacing
consumables.
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OPERATION
1. Occasionally an oxide layer may form over the tip
of the electrode, creating an insulating barrier
between the electrode and nozzle. This will result
in the tripping of the Pro-Cut's safety circuit. When
this happens turn the power off, remove the nozzle
and electrode and use the electrode to rub against
the inside bottom surface of the nozzle. This will
help remove any oxide buildup. Replace the noz-
zle, turn on the power and continue cutting. If the
safety circuit continues to trip after cleaning the
consumables, then replace them with a new set.
Do not continue to try and cut with excessively
worn consumables as this can cause damage to
the torch head and will degrade cut quality. Do not
allow torch cable or body to contact hot surface.
2. To improve consumable life, here are some sug-
gestions that may be useful:
a. Make sure the air supply to the Pro-Cut is
clean and free of oil. Use several extra in line
filters if necessary.
b. Minimize dross buildup on the nozzle tip by
starting the cut from the edge of the plate
when possible.
c. Pierce cutting should be done only when nec-
essary. If piercing, angle torch about 30° from
the plane perpendicular to the work piece,
transfer the arc, then bring the torch perpen-
dicular to the work and begin parallel move-
ment.
d. Reduce the number of pilot arc starts without
transferring to the work.
e. Reduce the pilot arc time before transferring
to the work.
f. Set air pressure to recommended setting. A
higher or lower pressure will cause turbulence
in the plasma arc, eroding the orifice of the
nozzle tip.
g. Use only Lincoln consumable parts. These
parts are patented and using any other
replacement consumables may cause dam-
age to the torch or reduce cut quality.
PRO-CUT 25
B-6
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