Cutting - Forney 700P Manuel D'utilisation

Cutting

CUTTING WITH A HAND TORCH
• The torch can be comfortably held in one hand or steadied with two hands. Choose the
technique that feels most comfortable and allows good control and movement. Position the
index finger or thumb to press the control switch on the torch handle.
• With the torch in starting position, press the trigger. After an initial gas purge (pre-flow), the
pilot arc will come on and remain on for 5 seconds until the cutting arc starts.
• For edge starts, hold the torch perpendicular to the work piece with the front of the tip on the
edge of the work piece at the point where the cut is to start (Fig. A). For piercing, angle the
torch slightly to direct the sparks away from the torch until the pierce is complete (Fig. B).
• For drag cuts keep the torch in contact with the work piece.
• For straight-line cuts, use a straight-edge as guide for your torch.
• For circle cuts, use a template or circle cutting attachment guide to get the radius you desire.
• Once started, the cutting arc remains on as long as the trigger is presed, unless the torch is
withdrawn from the work or torch motion is too slow. Keep moving while cutting. Cut at a
steady speed without pausing. Maintain the cutting speed so that the arc lag is about 30°
behind the travel direction (Fig. C).
• Adjust the torch speed so sparks go thru the metal and out the bottom of the cut.
• Pause at the edge (end of your cut) until the arc has cut completely through the work piece.
If sparks are being blown upward and back at the torch head, your torch travel speed is too
fast, decrease your travel speed.
• To shut off the torch simply release the control switch. When the switch is released a post-flow
will occur. If the torch trigger is pressed during the post-flow, the pilot arc will restart.
• Refer to the Troubleshooting section of this operating manual should the torch or system not
operate as expected.
NOTE: If the cutting arc is interrupted, and the torch trigger is still pressed, the pilot arc comes
back on automatically after 3 seconds.
NOTE: If sparks are being blown upward and back at the torch head, your torch travel speed is
too fast, decrease your travel speed.
NOTE: To cut grates, set cutting current between 20 - 35 A.
PIERCING WITH A HAND TORCH
NOTE: If necessary to make a cut on a metal sheet which is thicker than the maximum piercing capacity
(without an edge start) make a hole 1/4" using an electric drill to start cutting.
• When piercing with a hand torch, tip the torch slightly so that blowback particles blow away
from the torch tip (and operator) rather than directly back into it (Fig. B).
• Complete the pierce off the cutting line and then continue the cut onto the line. Hold the torch
perpendicular to the work piece after the pierce is complete (Fig. D).
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