MK Products Cobramatic II - Manual (Page 10)

Cobramatic ® II Owner's Manual - Page 3
T
HREADING
P
ROCEDURE
Place wire size selector switch on front panel to the correct position for the
wire being used.
NOTE:
For 3/64" and 1/16" aluminum wire use the "ALL OTHER WIRES" position.
Loosen end of wire from spool and cut off any kinked or bent portions.
Unreel and straighten out fi rst 6" to 8" of wire.
Release tension from slave motor drive rolls.
Route wire into inlet guide, along drive roll groove, and into wire conduit.
Prevent the wire spool from turning with the palm of the right hand, and at the
same time grasp the slave motor pressure adjusting knob.
Pull the torch trigger and slowly tighten the slave motor pressure adjusting
knob until the slave motor stalls; then add an additional 1/4 turn more.
CAUTION:
EXCESSIVE DRIVE ROLL TENSION WILL REDUCE RATHER THAN
IMPROVE WIRE FEED PERFORMANCE.
Tighten the torch pressure adjusting knob so the wire will be picked up and
fed through the contact tip. Proper tension is achieved when wire does not
slip if a small amount of pressure is added to the wire as it exits the tip.
S
PINDLE
D
RAG
A
DJUSTMENT
Loosen nut inside spindle until spring is not compressed.
When in the ".030-.035 Aluminum Only" position, tighten nut until you feel
spring start to compress then add 1 turn.
Press the trigger and make sure the wire comes level off of the spool. If you
can see the wire cast when feeding, add a little more drag. (1/4 turn)
When in the "All Other Wires" position, start with 3 turns of drag and adjust.
P
RE
-S
ETTING
S
LAVE
M
OTOR
T
ENSION
All Cobramatic ® s have preset adjusting nuts which enables spools of
the same wire diameter and type to be changed without further pressure
adjustment after initial set-up.
To preset the slave motor tension bottom out the pressure adjusting knob by
turning it completely clockwise.
Prevent the wire spool from turning and using a 9/16" wrench adjust the
preset nut until the slave motor stalls, then add an additional 1/4 turn.
Correct pressure will now be achieved by simply bottoming out the pressure
adjusting knob.
W
IRE
G
UARD
The Cobramatic ® Wire Guard (P/N 005-0618) is designed to keep the welding
wire from jumping off the spool inside the wire feed cabinet. When the trigger
is released and the brake engages, especially when using a new spool that
is heavier towards the outside, the spool will tend to rotate more against the
spindle drag adjustment.
However, since the wire is held by the slave motor it will not move and could
subsequently jump off the back of the spool and become lodged in the brake
mechanism, or jump off the front of the spool and electrically short-out to the
cabinet chassis. The wire guard will keep the wire from doing either.
The wire guard is designed to run inside the spool on top of the wire, and
when the brake is engaged the wire guard will hold the wire onto the spool.
The wire guard is made of a heavy woven nylon material that is resistant to