Programming and Operating — Turning Page 84 808D ADVANCED
Additional
Information
Part 2
s
SEQUENCE
Main program
Main program 123
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N20 L10; call
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N80 L10; call
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M30
Subprogram
L10
N10 R1=34…
N20 X...Z….
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M17
Sequence
Subprograms can be called from a main program, and also from another
subprogram. In total, up to 8 program levels, including the main program,
are available for this type of nested call.
In addition to the common specification in Cartesian coordinates (X, Z), the
points of a workpiece can also be specified using polar coordinates.
Polar coordinates are also helpful if a workpiece or a part of it is dimen-
sioned from a central point (pole) with specification of the radius and the
angle.
The polar coordinates refer to the plane activated with G17 to G19. In
addition, the third axis perpendicular to this plane can be specified. When
doing so, spatial specifications can be programmed as cylindrical coordi-
nates.
The polar radius RP= specifies the distance of the point to the pole. It is
saved and must only be written in blocks in which it changes, after the pole
or the plane has been changed.
The polar angle AP= is always referred to the horizontal axis (abscissa) of
the plane (for example, with G18: X axis). Positive or negative angle speci-
fications are possible. The positive angle is defined as follows: Starting
from the plus direction of X axis and rotates CCW.
It is saved and must only be written in blocks in which it changes, after the
pole or the plane has been changed.
Polar
coordinates
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