MK Products Prince SG - Manual (Page 10)

Prince ® SG Spool Gun Owner's Manual - Page 2
Note:
the brake assembly is designed to automatically control spool drag
and keep the wire from jumping off the spool.
Section B Operation
General Description
The Prince ® SG gun has a 24 volt DC gun motor and is controlled by a 3-3/4
turn potentiometer recessed in the pistol grip. The gun trigger is so designed
that when it is partially depressed, gas flow starts via the valve located in the
gun body - prior to ignition of the arc. When the trigger is partially released
after welding (extinguishing the arc), gas flow continues until the trigger is
fully released. Built-in pre and post gas flow. The gas cups and contact
tips used on the Prince ® SG air cooled barrel are the same as those used
on the Cobra ® SX. The drive and idler rolls are also the same as on all
Cobra Goosenecks. The modular design allows parts to be replaced in sub
assemblies for minimum spare parts inventory and less down time.
Barrels
The Prince ® SG air cooled systems come standard with a straight air cooled
barrel assembly. In cases where these barrels need to be extended or the tip
threads have been damaged, a Tip Extender can be adapted. The same tips
and threads can be used, however a longer Teflon liner is required.
Barrel Removal and Installation
To replace a barrel assembly, push the barrel assembly into the gun body
until it clicks to a stop. To assure proper seating of the barrel, open the
drive/idler roll door in the top of the handle. The rear face of the barrel should
now be flush with the gun body. Take care not to damage the “O” rings when
inserting into the body. Tighten set screws firmly so that barrel cannot rotate.
WARNING:
Do not attempt to weld without the barrel being tightly secured
in the gun body, or damage to the barrel or body may result. Failure to
take such precaution will void your warranty.
Controls and Settings
Potentiometer
The Potentiometer is located in the bottom of the pistol grip and provides 3-
3/4 turns of adjustment for up to 800 ipm.
The Potentiometer is mounted to one side of a PC board and is held in place
by a support plate. Both the Potentiometer and the support plate have slots
that locate and secure the Potentiometer in the handle. The other side
of the PC board houses the motor connectors and ribbon cable. Locking
disks behind the Potentiometer knob provides a stop at the minimum and
maximum Potentiometer settings.
Micro Switch
The micro switch assembly consists of the micro switch, leads, and
connector. The assembly is secured to the gun block with two (2) screws.
Drive and Idler Rolls
The Prince ® SG gun comes standard with a knurled drive roll and a grooved
idler roll, which will handle both steel and aluminum wire with diameters from
.023 - 3/64 inch. Optional insulated V-groove drive rolls are also available for
aluminum wire if desired (see Optional Kits).