HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 215)

HEIDENHAIN MANUALplus 620, CNC PILOT 640 215
4.6 C-axis cont
ours—F
undamentals
4.6 C-axis contours—
Fundamentals
Milling contour position
Define the reference plane or the reference diameter in the section
code. Specify the depth and position of a milling contour (pocket,
island) in the contour definition:
 With depth P programmed in the previous G308 cycle.
 Alternatively on figures: Cycle parameter depth P.
The algebraic sign of "P" defines the position of the milling contour:
 P<0: Pocket
 P>0: Island
 X: Reference diameter from the section code
 Z: Reference plane from the section code
 P: Depth from G308 or from cycle parameter
Contours in more than one plane (hierarchically nested contours):
 A plane begins with G308 and ends with G309.
 G308 defines a new reference plane/reference diameter. The first
G308 uses the reference plane defined in the section code. Each
following G308 defines a new plane. Calculation:
New reference plane = Reference plane + P (from previous G308).
 G309 switches back to the previous reference plane.
Position of milling contour
Section P Surface Milling floor
FRONT P<0
P>0
Z
Z+P
Z+P
Z
REAR SIDE P<0
P>0
Z
Z–P
Z–P
Z
SURFACE P<0
P>0
X
X+(P*2)
X+(P*2)
X
The area milling cycles mill the surface specified in the
contour definition. Islands within this surface are not
taken into consideration.