Tweco PCM-62 Machine Torch - Manual (Page 24)

OPERATION 4-4 Manual 0-2817
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 work-
piece 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withdrawn from the work or torch motion is too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 automatically.
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 gas post-flow
will occur. If the Torch Trigger is pushed during
the post-flow, the cutting arc will restart immedi-
ately when the torch is brought within range of
the workpiece.
B. Standoff Cutting Guide With Straight Edge
The Standoff Cutting Guide (option with some sys-
tems) can be used with a non-conductive straight
edge to make straight cuts by hand.
WARNING
The straight edge must be non-conductive.
Non-Conductive
Straight Edge
Cutting Guide
Standoff
Cutting Guide
Torch
A-02792
Shield Cup
Figure 4-5 Using Standoff Cutting Guide With
Straight Edge
The guide functions best when cutting 3/16 inch (4.7
mm) or greater solid metal with relatively smooth
surfaces. Use drag cutting for thinner metal.