Tweco CutMaster 12mm - Manual (Page 35)

CUTMASTER 12mm
Manual 0-5076 OPERATION 4T-3
and can be easily scraped off. "High speed dross" usually
forms a narrow bead along the bottom of the cut edge and
is very difficult to remove. When cutting a troublesome
steel, it is sometimes useful to reduce the cutting speed
to produce "slow speed dross". Any resultant cleanup can
be accomplished by scraping, not grinding.
4T.04 Hand Torch Operation
Standoff Cutting With Hand Torch
NOTE
For best performance and parts life, always use the
correct parts for the type of operation.
1. 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.
NOTE
The tip should never come in contact with the
workpiece except during drag cutting operations.
2. Depending on the cutting operation, do one of the fol-
lowing:
a) For edge starts, hold the torch perpendicular
to the workpiece with the front of the tip on the
edge of the workpiece at the point where the cut
is to start.
b) For standoff cutting, hold the torch 1/8 - 3/8 in
(3-9 mm) from the workpiece as shown below.
A-00024_AB
Shield Cup
Torch
Standoff Distance
1/8" - 3/8" (3 - 9mm)
Standoff Distance
3. Hold the torch away from your body.
4. 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
5. 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.
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.