202 ISO Programming
4.6 C-Axis Contours—Fundamentals
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.
Milling contour position
Section P Surface Milling floor
FACE P<0
P>0
Z
Z+P
Z+P
Z
REAR P<0
P>0
Z
Z–P
Z–P
Z
LATERAL 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.
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