258 ISO Programming
4.17 Contour-Based Turning Cycles
Recess turning cycle G869
G869 machines the defined contour area. The reference to the
contour to be machined can be transferred in the cycle parameters, or
the contour can be defined directly after the cycle call (see “Working
with contour-based cycles” on page 246).
The workpiece is machined by alternate recessing and roughing
movements. The machining process requires a minimum of retraction
and infeed movements. The contour to be machined may contain
various valleys. If required, the area to be machined is divided into
several sections.
Parameters
ID Auxiliary contour—ID number of the contour to be machined
NS Start block number
Beginning of the contour section, or
Reference to a G22/G23-Geo recess
NE End block number (end of contour section)
NE not programmed: The contour element NS is machined
in the direction of contour definition.
NS=NE programmed: The contour element NS is machined
opposite to the direction of contour definition.
NE is inapplicable if the contour is defined by G22/G23-Geo
P Maximum infeed
R Turning depth compensation for finishing (default: 0)
I Oversize in X direction (diameter value)—(default: 0)
K Oversize in Z direction (default: 0)
X Cutting limit (diameter value)—(default: no cutting limit)
Z Cutting limit (default: no cutting limit)
A Approach angle (default: opposite to recessing direction)
W Departure angle (default: opposite to recessing direction)
Q Action (default: 0)
0: Roughing and finishing
1: Only roughing
2: Only finishing
U Unidirectional turning (default: 0)
0: The roughing passes are bidirectional.
1: The roughing passes are unidirectional (from NS to NE)
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