Tweco PCM - 102 Machine Torch - Manual (Page 28)

OPERATION 4-4 Manual 0-2818
4.07 Hand Torch Operation
A. 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
following:
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 be-
low.
A-00024
Shield Cup
Torch
Standoff
Distance 1/8" - 3/8"
Figure 4-4 Standoff Distance
3. With the torch in starting position, press and hold
the Torch Trigger. After an initial two second pre-
flow, the pilot arc will come on and remain on
until the cutting arc starts.
4. Once on, the main arc remains on as long as the Torch
Trigger is held down, unless the torch is withdrawn
from the work or torch motion is too slow. If the cutting
arc is interrupted, the pilot arc comes back on auto-
matically.
NOTE
Most cutting is performed with the power supply
in the RUN position. For specific applications, the
LATCH position may be preferred where the Torch
Trigger can be released after the main arc transfer.
The torch remains activated until the main arc
breaks from the workpiece.
5. To shut off the torch simply release the Torch Trig-
ger. When the trigger is released a 20 second post-
flow will occur. If the Torch Trigger is pushed
during the post-flow, the cutting arc will restart
immediately when the torch is brought within
range of the workpiece.
B. Crown Shield Cup With Straight Edge
The crown shield cup can be used with a noncon-
ductive straight edge to make straight cuts by hand.
WARNING
The straight edge must be non-conductive.
Non-Conductive
Straight Edge
Cutting Guide
Crown Shield
Cup
Torch
A-02600
Figure 4-5 Using Crown 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. Use drag cutting for thinner
metal.