Plasma Cutting System Practices - Miller Electric Spectrum 1251 Owner's Manual

5-4. Plasma Cutting System Practices

Always connect work clamp to a clean,
paint-free location on metal workpiece, as
close to cutting area as possible.
90
Maintain approximately a 90 angle to the
workpiece surface for proper cutting results.
1/8 in
(3.2 mm)
When doing non-shielded cutting, maintain
approximately 1/8 in standoff between
electrode and surface.
OM-201 872 Page 20
.
A complete Parts List is available at www.MillerWelds.com
.
Set correct air pressure for process:
75 PSI (517 kPa) for cutting,
60 PSI (414 kPa) for gouging.
Sparks should pass through the workpiece
and out the bottom when cutting.
Wt
DO NOT put pressure on shield when
drag cutting; instead, slide shield along
the surface for proper cutting results.
The pilot arc starts immediately
when trigger is pressed.
DO NOT start pilot arc without cutting or
gouging as this shortens the service life
of the nozzle and electrode.
If sparks flare back from surface, this
usually is an indication that either travel
speed is too fast, amperage is set too low,
or consumables are worn.
Pulling rather than pushing the torch
makes cutting easier. Use a proper guide
or template for accurate cutting operations.
Ref. 803 640-A / 801 400-B / Ref. 802 878