CUTMASTER A120
Manual 0-4989 4T-1 OPERATION
SECTION 4 TORCH:
OPERATION
4T.01 Machine and Automated Torch
Operation
Cutting With Machine or Automated Torch
These torches are activated by remote control
pendant or by a remote interface device such
as CNC.
1. To start a cut at the plate edge, position the
center of the torch along the edge of the
plate.
Travel Speed
Proper travel speed is indicated by the trail of
the arc which is seen below the plate. The arc
can be one of the following:
1. Straight Arc
A straight arc is perpendicular to the work-
piece surface. This arc is generally recom-
mended for the best cut using air plasma on
stainless or aluminum.
2. Leading Arc
The leading arc is directed in the same direc-
tion as torch travel. A five degree leading arc
is generally recommended for air plasma on
mild steel.
3. Trailing Arc
The trailing arc is directed in the opposite
direction as torch travel.
Standoff Distance
Straight Arc
Trailing Arc
Leading Arc
Direction of Torch Travel
A-02586
Automation and Machine Torch Operation
For optimum smooth surface quality, the travel
speed should be adjusted so that only the lead-
ing edge of the arc column produces the cut. If
the travel speed is too slow, a rough cut will be
produced as the arc moves from side to side in
search of metal for transfer.
Travel speed also affects the bevel angle of a
cut. When cutting in a circle or around a corner,
slowing down the travel speed will result in a
squarer cut. The power source output should
be reduced also. Refer to the appropriate Con-
trol Module Operating Manual for any Corner
Slowdown adjustments that may be required.
Piercing With Machine or Automated Torch
To pierce, the arc should be started with the
torch positioned as high as possible above the
plate while allowing the arc to transfer and
pierce. This standoff helps avoid having molten
metal blow back onto the front end of the torch.
When operating with a cutting machine, a
pierce or dwell time is required. Torch travel
should not be enabled until the arc penetrates
the bottom of the plate. As motion begins,
torch standoff should be reduced to the recom-
mended 1/8 - 1/4 inch (3-6 mm) distance for
optimum speed and cut quality. Clean spatter
and scale from the shield cup and the tip as soon
as possible. Spraying or dipping the shield cup
in anti - spatter compound will minimize the
amount of scale which adheres to it.
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