Setting The Wire Drive System; Adjusting The Spool Position; Operation; Description - Forney 270 MIG Manual De Instrucciones

20. Select a contact tip stamped with the same diameter as the wire being used.
21. Slide the contact tip over the wire protruding from the end of the gun.Thread the contact tip
into the end of the gun and hand-tighten securely.
22. Install the nozzle on the gun assembly. For best results, coat the inside of the nozzle with
anti-stick spray or gel.
23. Cut off the excess wire that extends past the end of the nozzle.
24. Replace the wire spool casing cover and tighten adjustment knob by turning it clockwise.
25. Connect the welder power cord to the AC power source. Turn the welder ON. Set the VOLTAGE switch.

Setting the Wire Drive System

WARNING: Arc flash can injure eyes! To reduce the risk of arc flash, make certain that the
wire coming out of the end of the gun does not come in contact with the work piece, ground
clamp or any grounded material during the drive tension setting process or arcing will occur.
1. Open the wire drive cover on the spool gun
2. Pull the trigger on the gun.
3. Turn the drive tension adjustment knob clockwise, increasing the drive tension until the wire
seems to feed smoothly without slipping.
4. Close the wire drive cover on the spool gun.
5. When set correctly, there should be no slippage between the wire and the drive roller under
normal conditions.

Adjusting the Spool Position

Before you begin welding, you may want to adjust the position of the spool so it is most comfortable for
you. There are three positions to choose from. To change the position of the spool:
1. With a flat tipped screwdriver, loosen the screw which connects the spool casing to the gun.
2. Pull the casing far enough away from the gun to allow the casing to rotate.
3. Rotate the casing to one of the three available positions, making sure that the grooves on the
gun are aligned with the grooves on the casing.
4. Push the casing and the gun back together.
5. With a flat tipped screwdriver, tighten the screw which connects the spool casing to the gun.

Operation

Description

The Forney 270 MIG welder is designed for use on jobs involving maintenance and fabrication. It is
ideal for applications such as farming, automotive, and repairs. This transformer-based machine is
powered from 230 V current and produces 270 A output. The acceptable wire diameters for use on
this machine include .024", .030", .035", and .045". The spool sizes compatible with this machine
are 4", 8", or 12" and should be loading clockwise, so the wire feeds from the top into the wire feeing
system. This machine can weld materials up to 1/2" in thickness.
With welders in the digital series, thanks to a special electronic card it is possible to adjust externally
the main welding parameters. The main purpose of these units is to make adjustment of these
parameters very easy.
The microprocessor control handles the functions of the PC board that are viewed by means of LED's
while a digital display shows the parameters set and welding current. Units may be used either with the
standard torch (supplied with them) or with the Spool Gun.
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