Tweco PCM-120 Machine Torch - Manual (Page 13)

Manual 0-2698 2-1 INTRODUCTION & DESCRIPTION
SECTION 2:
INTRODUCTION &
DESCRIPTION
2.01 Scope of Manual
This manual contains descriptions, operating instructions
and maintenance procedures for the PCH/M-120 Liquid
Cooled Torch. Service of this equipment is restricted to
properly trained personnel; unqualified personnel are
strictly cautioned against attempting repairs or adjust-
ments not covered in this manual, at the risk of voiding
the Warranty.
Read this manual thoroughly. A complete understand-
ing of the characteristics and capabilities of this equip-
ment will assure the dependable operation for which it
was designed.
2.02 General Description
NOTE
Refer to Section 2.05, Introduction To Plasma, for
a more detailed description on plasma theory.
The Torch is a liquid cooled torch that provides cutting
capacity of up to 1-1/2 inches (38.1 mm) at 120 amperes.
In the torch, one torch lead provides plasma gas and one
lead provides secondary gas to the torch head. The leads
also provide the closed loop for the liquid coolant flow
from the Power Supply.
Plasma torches are similar in design to the common au-
tomotive spark plug. They consist of negative and posi-
tive sections which are separated by a center insulator.
Inside the torch, the pilot arc is initiated in the gap be-
tween the negatively charged electrode and the positively
charged tip. Once the pilot arc has ionized the plasma
gas, the superheated column of gas flows through the
small orifice in the torch tip, which is focused on the metal
to be cut.
2.03 Specifications & Design
Features
The following applies to the Torch only:
A. Torch Configurations and Dimensions
1. Hand Torch (PCH)
Torch is available with torch heads at 70° and 90°
to the torch handle. The hand torches include a
torch handle and multi-position torch switch as-
sembly.
2. Machine Torch (PCM)
Machine Torch (180°) is supplied with a metal rack
and pinion mounting assembly, Remote ON/OFF
Pendant (Unshielded Leads) or CNC Cable
(Shielded Leads).
17.4 in.
4.3 in.
(109.2mm)
2.5 in.
1.5 in.(38.1mm)
1.9 in. (48.3mm)
3.5 in.
14.3 in.
13.3 in.
3.3 in.
1.5 in.
1.4 in.
1.5 in.
1.4 in.
13.5 in.
A-02683
(337mm)
(342.9mm)
(38.1mm)
(363.2mm)
(35.6mm)
(83.8mm)
(38.1mm)
(88.9mm)
(35.6mm)
(44.2mm)
(86.4mm)
(68.5mm)
70˚
90˚
180˚
3.4 in.
Figure 2-1 Torch Dimensions and Configurations