Tweco 151 CutMaster - Manual (Page 29)

Manual 0-4668 4-5 OPERATION
H. Select Current Output Level
1. Place RUN / Rapid Auto Restart / SET to RUN (up) or Rapid Auto Restart (center) position. Gas flow stops.
2. Set the current output level, up to 40 amps for drag cutting (with the torch tip in contact with the workpiece), or
up to 100 amps for standoff cutting. At output settings higher than 40 amps, the power supply automatically
reduces output current to 40 amps if the torch tip contacts the workpiece.
Art # A-04256
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I. Cutting Operation
Refer to the manual supplied with the torch for details on cutting operation, cutting speeds, parts selection and replacement,
etc.
When the torch leaves the workpiece during cutting operations with the RUN / Rapid Auto Restart / SET switch in the RUN
(up) position, there is a brief delay in restarting the pilot arc. With the switch in the 'Rapid Auto Restart' (middle) position,
when the torch leaves the workpiece the pilot arc restarts instantly, and the cutting arc restarts instantly when the pilot arc
contacts the workpiece. Use the 'Rapid Auto Restart' position when cutting expanded metal or gratings, or in gouging or
trimming operations when an uninterrupted restart is desired.
NOTE
When the shield cup is properly installed, there is a slight gap between the shield cup and the torch handle. Gas
vents through this gap as part of normal operation. Do not attempt to force the shield cup to close this gap. Forcing
the shield cup against the torch head or torch handle can damage components.
J. Typical Cutting Speeds
Cutting speeds vary according to torch output amperage, the type of material being cut, and operator skill. Refer
to the Torch Manual for details.
Output current setting or cutting speeds may be reduced to allow slower cutting when following a line, or using
a template or cutting guide while still producing cuts of excellent quality.