HEIDENHAIN CNC Pilot 4290 - Manual (Page 107)

HEIDENHAIN CNC PILOT 4290 95
Pocket or island
Continued
4.5.5 Contour Position
Milling depth, contour position
You must 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” in the previously programmed G308
■ Alternatively on figures: Cycle parameter ”depth P”
The algebraic sign of ”depth P” defines the position of the milling
contour (see table):
■ P<0: Pocket
■ P>0: Island
Section P Surface Milling floor
FRONT P<0 Z Z+P
FRONT P>0 Z+P Z
REAR SIDE P<0 Z Z–P
REAR SIDE P>0 Z–P Z
SURFACE P<0 X X+(P*2)
SURFACE P>0 X+(P*2) X
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
Programming with hierarchically nested contours:
■ Start with G308 ”begin pocket/island” and end with G309 ”End of
pocket/island.” G308 sets a ”new” reference plane/reference
diameter:
■ The first G308 uses the reference plane defined in the section code.
■ Every following G308 sets a new reference plane.
Calculation: Currently active reference plane + P (from the
previous G308).
■ G309 switches back to the previous reference plane.
Start pocket/island G308-Geo
New reference plane/reference diameter for hierarchically nested
front-face, rear-face, or lateral face contours.
Parameters
P:
Depth for pocket, height for islands
Island: The area-milling cycles machine
the complete area specified in the contour
definition. Islands within this surface are
not taken into consideration.
4.5 Geometry Commands