Instruction manual

7
SET-UP AND OPERATION CONTINUED:
WIRE SPEED AND VOLTAGE ADJUSTMENT:
The wire speed control on the front of the LDC-NA3S Wire Feed Control box has a dial that is
calibrated directly in inches per minute. Set the voltage using the control on the power source.
RISE AND FALL OF THE CAM:
All circle welders are equipped with a rise and fall cam as-
sembly. The cam assembly must be aligned before any other
settings can be made. To align the cam rotate the machine so
the horizontal rack is parallel to the pipe, then adjust the gun
holder so it is perpendicular to the horizontal rack. Position
torch tip to top dead center of joint. Loosen the set screws in
the brass block on the cam, and rotate the cam to the vertical
position as shown. Refasten set screws.
CAM SETTING:
The cam setting is equal to distance “B” subtracted from
distance “A”.
Example:
Let A=3 and B=2
3-2=1
The cam setting is 1.
WHEEL ADJUSTMENT:
The CW-18 Racking System CWO-1840 and the Small Vertical Racker
CWO-1690 are equipped with adjustable wheels. Always check these
components for proper wheel adjustment before using the machine. The
wheels need adjustment if you can cock or wiggle the components out of
alignment. The wheels should be snug but not prohibit movement along
the path of travel. The wheels with the hex stand offs are adjustable. To
adjust the wheels, loosen the hex bolt (A) until the adjustable bushing (B)
can be rotated. Correct the wheel alignment by rotating the adjustable
bushing (B). Once adjusted, hold the adjustable bushing (B) while
tightening the hex bolt (A). Recheck alignment.
MACHINE CONTROLS:
Operational parameters can be set using the two control boxes. Please
refer to the section in this manual entitled CWO-6210-CW18 Rotational
Control for descriptions of the various speed and directional capabilities. For the LD-NA3S NA-3 Wire
Feeder Control; refer to the supplied NA-3 Semiautomatic Wire Feeder Manual from Lincoln Electric.
MAKING A WELD:
1. Position the gun to start position using the CWO-1840 Racking System.
2. Connect the ground cable to the workpiece. The ground cable must make good electrical
contact with the work.
3. Position the electrode in the joint. The end of the electrode may be lightly touching the
work.
4. With manual/auto switch in the “OFF” position, set rotation direction and speed.
5. Weld process and rotation are both started by throwing the manual/auto switch to auto.
6. Weld process and rotation are stopped by throwing the manual/auto switch to “OFF”.
Cam
Torch
Holder
Pipe
B
A
B
A
A
B