Loading Wire Drive; Idle Roll Pressure Setting - Lincoln Electric IM812-A Operator's Manual

B-3
FIGURE B.1 – LOADING A 50 OR 60 LB COIL.
SPINNER
NUT
COVER
PLATE
COIL
REEL

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
The electrode circuit is electrically "hot" when the
power source is on.
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OPERATION
e. Press the gun trigger and push the electrode until
it just enters the drive roll.
When inching with gun trigger, the electrode and
drive mechanism are always "hot" to work and
ground.
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f. Inch the electrode through the gun.
SLOTS
CARDBOARD

IDLE ROLL PRESSURE SETTING

COIL
LINER
The idle roll pressure is set at the factory backed out
two turns from full pressure. This is an approximate
setting. The optimum 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
TIE WIRE
the gun trigger for several seconds.
SPRING
2. If the wire "birdnests," jams or breaks at the drive
LOADED
roll, the idle roll pressure is too great. Back the
ARM
pressure setting out
gun, and repeat above steps.
3. If the only result is drive roll slippage, shut off the
power source, then loosen the gun cable
clamping screw in the gearbox conductor block
and pull the gun cable forward about six inches.
There should be a slight waviness in the exposed
wire. If there is no waviness, the pressure is too
low. Increase the pressure setting
gun cable in place and repeat the above steps.
LN-35
WARNING
1 ⁄ turn, run new wire through
2
1 ⁄ turn, lock the
4
B-3