HEIDENHAIN MANUALplus 620 335
4.26 Milling Cycles
Approach and departure: For closed contours, the point of the
surface normal from the tool position to the first contour element is
the point of approach and departure. If no surface normal intersects
the tool position, the starting point of the first element is the point of
approach and departure. For figures, use D and V to select the
approach/departure element.
R Radius of approaching/departing arc (default: 0)
R=0: Contour element is approached directly; infeed to
starting point above the milling plane, then vertical plunge.
R>0: Tool moves on approaching/departing arc that
connects tangentially to the contour element.
R<0 for inside corners: Tool moves on approaching/
departing arc that connects tangentially to the contour
element.
R<0 for outside corners: Contour element is approached/
departed tangentially on a line
P Milling depth (indicated as a negative value)
XS Milling top edge—lateral surface (replaces the reference
plane from the contour definition)
ZS Milling top edge—face (replaces the reference plane from the
contour definition)
RB Return plane (default: back to starting position)
Front or rear face: Return position in Z direction
Lateral surface: Return position in X direction (diameter)
B Chamfer width when deburring the edges
J Preparation diameter. For open contours, the contour to be
deburred is calculated from the programmed contour and J.
The following rules apply:
J programmed: The cycle deburrs both sides of the slot
(see 1 in the illustration).
J not programmed: The deburring tool is so wide that both
sides of the slot are deburred in one pass (see 2 in the
illustration).
D Starting element number when partial figures are machined.
V End element number when partial figures are machined.
The direction of contour definition for figures is
counterclockwise. The first contour element for figures:
Circular slot: The larger arc
Full circle: The upper semicircle
Rectangles, polygons and linear slots: The orientation angle
points to the first contour element.
A Sequence for “Milling, deburring”: A=0 (default=0)
Parameters—Deburring
Cycle run for deburring
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