Tweco PCM-62 Machine Torch - Manual (Page 30)

SERVICE 5-2 Manual 0-2817
NOTE
DO NOT use other lubricants or grease, they may
not be designed to operate within high tempera-
tures or may contain “unknown elements” that
may react with the atmosphere. This reaction can
leave contaminants inside the torch. Either of these
conditions can lead to inconsistent performance or
poor parts life.
5.03 Common Operating Faults
The following lists the more common cutting faults and
what is the possible cause:
1. Insufficient Penetration
a. Cutting speed too fast
b. Torch tilted too much
c. Metal too thick
d. Worn torch parts
e. Cutting current too low
f. Non - Genuine Thermal Dynamics Parts
2. Main Arc Extinguishes
a. Cutting speed too slow
b. Torch standoff too high from workpiece
c. Cutting current too high
d. Work cable disconnected
e. Worn torch parts
f. Non - Genuine Thermal Dynamics Parts
3. Excessive Dross Formation
a. Cutting speed too slow
b. Torch standoff too high from workpiece
c. Worn torch parts
d. Improper cutting current
e. Non - Genuine Thermal Dynamics Parts
4. Short Torch Parts Life
a. Oil or moisture in air source
b. Exceeding system capability (material too thick)
c. Excessive pilot arc time
d. Air flow too low (incorrect pressure)
e. Improperly assembled torch
f. Non - Genuine Thermal Dynamics Parts
5.04 Inspection and Replacement
Consumable Torch Parts
WARNINGS
Disconnect primary power to the system before
disassembling the torch or torch leads. DO NOT
touch any internal torch parts while primary power
is connected.
Remove the consumable torch parts per the following
procedure:
NOTE
The tip and gas distributor are held in place by the
shield cup. Position the torch with the shield cup
facing upward to prevent these parts from falling
out when the cup is removed.
1. Unscrew and remove the shield cup from the torch.
NOTE
Slag built up on the shield cup that cannot be re-
moved may effect the performance of the system.
2. Inspect the cup for damage. Wipe it clean or replace
if damaged.
Torch Head Assembly
(70˚ Hand Torch Shown)
Shield Cup
Gas
Distributor
Tip
Electrode
A-02890
Figure 5-1 Front End Torch Parts Assembly
3. Remove the tip. Check for excessive wear (indicated
by an elongated or oversized orifice). Clean or re-
place the tip if necessary.