Siemens SINUMERIK 840D Programming Manual page 117

03.96
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08.97
CPA, CPO and RAD (center point and radius)
The position of the circle in the machining plane is
defined by the center point (parameters CPA and CPO)
and the radius (parameter RAD). Only positive values
are permissible for the radius.
STA1 and INDA (start angle and indexing angle)
The arrangement of the elongated holes around the
circle is defined by these parameters.
If INDA=0 the indexing angle is calculated from the
number of elongated holes so that they are equally
distributed around the circle.
Further notes
A tool offset must be activated before the cycle is
called. Otherwise the cycle is aborted and alarm
61000 "No tool offset active" is output.
If incorrect values are assigned to the parameters
that determine the arrangement and size of the
elongated holes and thus cause mutual contour
violation of the elongated holes, the cycle is not
started. The cycle is aborted after the error message
61104 "Contour violation of slots/elongated holes".
is output.
During the cycle, the workpiece coordinate system is
shifted and rotated. The values in the workpiece
coordinate system are displayed on the actual value
display as if the longitudinal axis of the elongated
hole being machined were positioned on the first
axis of the current machining plane.
When the cycle is completed, the workpiece
coordinate system is again in the same position as it
was before the cycle was called.
 Siemens AG 2000 All rights reserved.
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
3.4 Elongated holes on a circle - LONGHOLE
Milling Cycles
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