Tweco CutMaster 12mm-20mm-25mm - Manual (Page 19)

CUTMASTER 12, 20, 25mm
Manual 0-5117 2T-1 INTRODUCTION
SECTION 2 TORCH:
INTRODUCTION
2T.01 Scope of Manual
This manual contains descriptions, operating
instructions and maintenance procedures for the
1Torch Models SL60/Manual and SL100/Mecha-
nized Plasma Cutting Torches. Service of this
equipment is restricted to properly trained person-
nel; unqualified personnel are strictly cautioned
against attempting repairs or adjustments not
covered in this manual, at the risk of voiding the
Warranty.
Read this manual thoroughly. A complete under-
standing of the characteristics and capabilities of
this equipment will assure the dependable opera-
tion for which it was designed.
2T.02 General Description
Plasma torches are similar in design to the auto-
motive spark plug. They consist of negative and
positive sections separated by a center insulator.
Inside the torch, the pilot arc starts in the gap
between 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.
A single torch lead provides gas from a single
source to be used as both the plasma and second-
ary gas. The air flow is divided inside the torch
head. Single - gas operation provides a smaller
sized torch and inexpensive operation.
NOTE
Refer to Section "2T.05 Introduction
to Plasma" on page 2T-2, for a more detailed
description of plasma torch operation.
Refer to the Appendix Pages for additional
specifications as related to the Power Supply
used.
2T.03 Specifications
A. Torch Configurations
1. Hand/Manual Torch, Models
The hand torch head is at 75° to the torch han-
dle. The hand torches include a torch handle
and torch trigger assembly.
10.125" (257 mm)
3.75"
(95 mm)
1.17" (29 mm)
Art # A-03322_AB
2. Mechanized Torch, Model
The standard machine torch has a positioning
tube with rack & pinch block assembly.
Art # A-02998
1.75" /
44.5 mm
1.375" / 35 mm
15.875" / 403 mm
0.625" /
16 mm
4.95" / 126 mm
1.175" / 30 mm
9.285" / 236 mm
B. Torch Leads Lengths
Hand Torches are available as follows:
• 20 ft / 6.1 m, with ATC connectors
• 50 ft / 15.2 m, with ATC connectors
Machine Torches are available as follows:
• 5 foot / 1.5 m, with ATC connectors
• 10 foot / 3.05 m, with ATC connectors
• 25 foot / 7.6 m, with ATC connectors
• 50 foot / 15.2 m, with ATC connectors
C. Torch Parts
Starter Cartridge, Electrode, Tip, Shield Cup
D. Parts - In - Place (PIP)
Torch Head has built - in switch
12 VDC circuit rating
E. Type Cooling
Combination of ambient air and gas stream
through torch.