Tweco A120 CutMaster - Manual (Page 39)

CUTMASTER A120
Manual 0-4989 OPERATION 4T-5
3
4
Art # A-03383
Trigger
2
1
Trigger Release
6. Cut as usual. Simply release the trigger assembly to
stop cutting.
7. Follow normal recommended cutting practices as
provided in the power supply operator's manual.
NOTE
When the shield cup is properly installed, there
is a slight gap between the shield cup and the
torch handle. Gas vents through this gap as part
of normal operation. Do not attempt to force the
shield cup to close this gap. Forcing the shield cup
against the torch head or torch handle can damage
components.
8. For a consistent standoff height from the workpiece,
install the standoff guide by sliding it onto the torch
shield cup. Install the guide with the legs at the sides
of the shield cup body to maintain good visibility of the
cutting arc. During operation, position the legs of the
standoff guide against the workpiece.
Shield Cup
Workpiece
Standoff Guide
Art # A-04034
Torch Tip
Shield Cup With Straight Edge
The drag shield cup can be used with a non conductive
straight edge to make straight cuts by hand.
WARNING
The straight edge must be non - conductive.
A-03539
Non-Conductive
Straight Edge
Cutting Guide
Using Drag Shield Cup With Straight Edge
The crown shield cup functions best when cutting 3/16
inch (4.7 mm) solid metal with relatively smooth surface.
Drag Cutting With a Hand Torch
Drag cutting works best on metal 1/4" (6 mm) thick or less.
NOTE
For best parts performance and life, always use the
correct parts for the type of operation.
1. Install the drag cutting tip and set the output current.
2. The torch can be comfortably held in one hand or
steadied with two hands. Position the hand to press
the Trigger on the torch handle. With the hand torch,
the hand may be positioned close to the torch head for
maximum control or near the back end for maximum
heat protection. Choose the holding technique that
feels most comfortable and allows good control and
movement.
4. Keep the torch in contact with the workpiece during
the cutting cycle.
5. Hold the torch away from your body.
6. Slide the trigger release toward the back of the torch
handle while simultaneously squeezing the trigger. The
pilot arc will start.
A-02986
Trigger
Trigger Release
7. Bring the torch within transfer distance to the work.
The main arc will transfer to the work, and the pilot arc
will shut OFF.
NOTE
The gas preflow and postflow are a characteristic
of the power supply and not a function of the torch.