37
4.4 Stando and Cut Quality
Stando (Arc Voltage) has a direct inuence on cut quality and squareness. It is recom-
mended that prior to cutting, that all cutting parameters are set to the manufacturer’s
suggested conditions. Refer to the Process Tables for recommendations. A sample
cut should be made using actual part material followed by close examination of
the part.
If the cut face of the part has excessive bevel or rounded top edge, it may be that the
stando is set too high. When stando is controlled by an arc voltage height control,
reducing the arc voltage setting will reduce the stando.
Lower the stando until the excessive bevel or rounded top edge disappears. The
characteristics of plasma cutting hinder production of a perfectly square cut. On
material thicknesses of 1/4 inch or greater, a stando too close may result in a nega-
tive cut angle.
Fig. 18 - Cut Angle
Bottom dimension “B”
is less than dimension
“A”
NEGATIVE (-) CUT ANGLE
Bottom dimension “B”
is greater than dimen-
sion “A”
POSITIVE (+) CUT ANGLE
A
B
A
B
Fig. 17 - Cut Quality
LAG LINES
ARC
VOLTAGE
STANDOFF
SECTION 4 OPERATION
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