HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 168)

168
4.9 C-Axis Cont
ours—F
undamentals
4.9 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.
Start pocket/island G308-Geo
G308 defines a new reference plane / reference diameter in
hierarchically nested contours.
Milling contour position
Section P Surface Milling floor
STIRN [FRONT] P<0
P>0
Z
Z+P
Z+P
Z
RUECKSEITE [REAR
SIDE] P<0
P>0
Z
Z–P
Z–P
Z
MANTEL
[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.
Parameters
P Depth for pocket, height for islands