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DoAI.L iNSTRUCT|ON MANUAL 35
2.
If
a
weld "burns out”, the circuit has
not
been broken when the jaws have
com-
pleted their full .05 2" travel.
MOVABLE
WELDER JAW
,
0 O
CUT OFF
___j.
_
SWITCH
SLIDE ROD
i
">\HOl—E FOR
ADJUSTING
ECONTACT
POINTS
Lt
Figure 40
~
Thesetwo failures
can
be corrected by
adjustment of the cut-off switch which
con-
trols the length of time the
current"
flows
through the jaws.
‘
This switch is
a
leaf switch which is open-
ed and closed by the slide rod connected
to
the movable welder jaw. When the welding
switch lever is depressed, the jaw closes,
pushing the slide rod
over
until the leaves of
the cut-off switch open.
A'hole in the outside leaf of the cut-oi?‘
switch permits insertion of
an
Allen type
wrench into the end-knob of the slide rod.
This knob
screws
in and
out
to
permit careful
adjustments of the timing.
A
quarter
turn
of the knob will
cause
a
movement
of .008"
in
or
out.
Each click of the ratchet is equival-
ent
to
.002"
movement.
A
clockwise rotation
of this knob produces
a
slower breaking of
the welder circuit. This will produce
more
heat
at
the point of the weld and
correct
for
jaw
movement
after the weld has been made.
A
counter-clockwise adjustment will allow
less heat
to
prevent "burning out” of the
weld.
To adjust the timing proceed
as
follows:
A. Disconnect electric power.
B. Remove the welder from the column by
removing the six panel
screws.
Grasp the
lamp shade
as
a
handle and pull the panel
forward until
it
is
at
approximately
a
45
degree angle. The angle strip
at
the bottom
of the welder panel’
acts
as
a
hinge, and
a
stop holds the assembly from tilting more
than 405 degrees outward.
C. Depress the welding lever and check
the cut-off switch. There should be
a
gap
between the
contact
points of 1/3 2"
to
3/64". Adjust with the Allen type wrench
if
necessary.
D.
If
the welds still tend
to
burn out,
two
other points should be checked.
(a) The slide rod may be sticking. Check
to
see
that the movable jaw has
a
free
movement
of .052".
A
drop of oil
on
the slide rod worked along by
_
repeated depressing of the lever may
correct
this trouble.
If
it
does not,
remove
the slide rod and clean it. Be-
fore removing the slide rod, clamp
a
piece of
saw
band securely between
the welder» jaws
to
maintain __‘___the
13/64" spacing between them.
i
(b) The web strap which conducts elec-
tricity
to
the movable jaw may have
become kinked causing
it
to
bind the
jaw. Check the jaw for free
move-
ment.
To
secure
consistent results,
wipe the welder jaws and clamps
clean of all scale and flash after each
weld.
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