Crafstman 196.205070 Manual Del Propietário página 14

WARNING
EXPOSURE TO A PLASMA ARC IS
EXTREMELY HARMFUL TO THE EYES
AND SKIN! Prolonged exposure to the plas-
ma arc can cause blindness and burns.
Never strike an arc or begin cutting until you
are adequately protected. Wear flameproof
welding gloves, a heavy long sleeved shirt,
cufftess trousers, high topped shoes and a
welding helmet.
3. With the torch in the starting position pull
and hold the trigger. The pilot arc will
come on until the cutting arc starts.
(Once on, the main arc stays on as long
as the trigger is held down, unless the
torch is withdrawn from the work or the
cutting motion is too stow.)
4. With the torch nozzle perpendicular to
the workpiece, pull (or push) the torch
across the area to be cut at a moderate,
steady pace.
5. To shut the torch off, simply release the
trigger.
Note: When the trigger is released and the
arc is extinguished, compressed air wilt con-
tinue to flow for a short period, in order to
cool the torch. DO NOT switch off the
machine until the air has stopped flowing or
damage to the torch may occur.
PIERCING
A "piercing" operation is defined as one
where the plasma arc creates a new pene-
tration in a workpiece. Unlike a Cutting oper-
ation, this means that there is no existing
edge to begin work from. The arc is forced
through the workpiece, thereby creating a
new "edge." After the initial penetration has
been made, a piercing operation is treated in
the same manner as a cutting operation.
1. Position your index finger on the trigger.
2. Hold the torch approximately 1/4 inch
above the workpiece, with the nozzle ori-
fice directly over the spot on the work-
piece where piercing is desired. It may
be necessary to angle the torch VERY
slightly while at this point to ensure that
sparks and/or spatter will not rebound
into the nozzle cap and nozzle.
14
WARNING
EXPOSURE TO A PLASMAARC IS
EXTREMELY HARMFUL TO THE EYES
AND SKIN! Prolonged exposure to the plas-
ma arc can cause blindness and burns.
Never strike an arc or begin cutting until you
are adequately protected. Wear flameproof
welding gloves, a heavy long sleeved shirt,
cuffless trousers, high topped shoes and a
welding helmet.
3. Pull and hold the torch trigger.
4. Lower the tip of the torch to within 1/8
inch of the workpiece or until the main
cutting arc transfers to the workpiece and
sparks start.
4. If you intend only to pierce the workpiece,
release the trigger when the plasma
stream has penetrated the material.
5. For extended cuts, proceed to putt (or
push) the torch across the area to be cut
at a moderate, steady pace.
6. To shut the torch off, simply release the
trigger.
Note: When the trigger is released and the
arc is extinguished, compressed air will con-
tinue to flow for a short period, in order to
cool the torch. DO NOT switch off the
machine until the air has stopped flowing or
damage to the torch may occur.
RECOMMENDED CUTTING SPEEDS
The cutting speed necessary to produce
good, clean cuts depends on several vari-
ables: Material Type, Material Thickness,
Distance from the material to be cut,
Accuracy of the operator, Line voltage fluctu-
ations and a host of others. Table 3 offers
some general suggestions for cutting
speeds, assuming that all conditions are
ideal. Actual results may vary and it is rec-
ommended that you practice your cuts
before beginning work on any valuable
materials.
Inches
Material Gauge per minute
Stainless Steel 20 60
Galvanized Steel 18 60
Aluminum 16 20
Carbon Steel 10 10
Table 3. Cutting Speeds