Kaliburn SR-45i, User Manual

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Operation SR-45i User’s Manual
Cut Quality
Before the optimum cutting condition can be achieved on a particular material
type and thickness, the machine operator must have a thorough understanding of
the cutting characteristics of the SR-45i system. When the cut quality is not
satisfactory, the cutting current, speed, or torch height may need to be adjusted
until the proper cutting condition is obtained. The following guidelines should be
useful in determining which cutting parameter to adjust.
Note: Before making any parameter changes, verify that the torch is square
to the workpiece. Also, it is essential to have the correct torch parts in place
and to ensure that they are in good condition. Check the electrode for
excessive wear and the nozzle orifice for roundness. Also, make sure that the
air pressure is adjusted to 65 psi with the Gas switch in the Set position and
that the air supply is not contaminated.
1. A positive cut angle (top dimension of piece smaller than the bottom
dimension) usually occurs when the torch standoff distance is too high, when
cutting too fast, or when excessive power is used to cut a given plate
thickness.
2. A negative cut angle (top dimension of piece larger than the bottom
dimension) usually occurs when the torch standoff distance is too low or when
the cutting speed is too slow.
3. Top dross usually occurs when the torch standoff distance is too high.
4. Bottom dross usually occurs when the cutting speed is either too slow (slow-
speed dross) or too fast (high-speed dross). Low-speed dross is easily
removed, while high-speed dross usually requires grinding or chipping off.
5. Note that different material compositions have an effect on dross formation.
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