CHAPTER 3: OPERATING INSTRUCTIONS
THIN-LINE
®
SERIES 180M WELD HEADS
990-133
3-5
easily detected by observing the firing switch indicator on the welding power supply or control.
For older or non-Miyachi Unitek controls, an ohmmeter or continuity checker can be connected
to the pins on the firing switch connector.
4
Use the force gauge reading from the previous step as a starting point. Use the force
adjustment knob to
increase
the indicated force if the initial force reading is
less than
the
required force setting. If the initial force reading is
greater than
the required force setting,
decrease
the indicated force.
5
Depress and release the footpedal. Verify that the force applied by the operator does not
exceed the force required to close the firing switch by more than five percent (5%).
6
After setting the required force, remove the force adjustment knob by loosening the two
setscrews that secure it to the shaft. Invert the knob and place it on the shaft. Be sure to insert
the locking tab on the knob into the slot on the force tube. Re-tighten both setscrews.
7
If necessary, re-adjust the electrodes in their holders to accommodate the workpiece.
8
Turn the downstop screw counter-clockwise to its fullest extension without actually
disengaging it. This will allow maximum downward travel of the upper arm. The following
downstop adjustment should be made
only
if the workpiece would be damaged if the upper arm
travels too far.
In most applications, use of the downstop is not recommended
.
A)
Place the workpiece in the appropriate position. Rotate the downstop screw clockwise until
the electrode(s) no longer contacts the workpiece. Check the adjustment by depressing and
releasing the footpedal.
B)
Depress and
hold
the footpedal. Slowly rotate the downstop counter-clockwise until the
force-firing switch in the head closes. Rotate the downstop one or two additional turns
counter-clockwise. The additional turn(s) will allow for electrode wear and/or the slight
variations of the position of the electrode in its holder. Re-check that the firing switch
consistently closes.
CAUTION:
Do
not
attempt to use the downstop adjustment to limit the force, which is
applied to the workpiece. This will result in inconsistent welds.
Summary of Contents for THIN-LINE 180 M Series
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