Loading Wire Drive; Idle Roll Pressure Setting - Lincoln Electric IM359-G Operating Manual

B-5
BRAKE HOLDING PIN
(MUST ENGAGE HOLE IN
ADAPTER RIB)
GROOVES

LOADING WIRE DRIVE

a. Turn the reel or spool until the free end of the
electrode is accessible.
b. While tightly holding the electrode, cut off the
bent end and straighten the first six inches. Cut
off the first inch. (If the electrode is not properly
straightened, it may not feed or may not go into
the outgoing guide tube causing a "birdnest".)
c. Insert the free end through the incoming guide
tube to the drive roll.
d. Turn on the welding power source.
WARNING
Unless an optional output control or internal
contactor is used with the LN-25, the electrode circuit
is electrically "hot" when the power source is on.
e. Press the gun trigger and push the electrode
until it just enters the drive roll.
WARNING
When inching with gun trigger, the electrode and
drive mechanism are always "hot" to work and
ground. Use the "cold" inch switch on models with
internal contactor.
LN-25
OPERATION
FIGURE B.2 READI-REEL INSTALLATION
MOLDED ADAPTER
2" O.D. SPINDLE
READI-REEL
RETAINING SPRING
INSIDE CAGE WIRES
THREAD LOCKING COLLAR
f. Inch the electrode through the gun.
g. Adjust the brake tension with the thumbscrew on
the spindle hub until the reel turns freely, but
with little or no overrun when wire feeding is
stopped. Do not overtighten.
CAUTION
Keep gun in LN-25 gun holder when not feeding wire
to prevent accidental arcing.

IDLE ROLL PRESSURE SETTING

The idle roll pressure is set at the factory backed out
two turns from full pressure. This is an approximate
setting. For small wire sizes and aluminum wire, the
optimum idle roll pressure varies with type of wire,
surface condition, lubrication and hardness. The op-
timum idle roll setting can be determined as follows:
1. Press end of gun against a solid object that is
electrically isolated from the welder output.
Press the gun trigger for several seconds.
2. If the wire "birdnests," jams or breaks at the drive
roll, the idle roll pressure is too great. Back the
pressure setting out 1 ⁄
2
gun, and repeat above steps.
turn, run new wire through