Operation Manual

HEIDENHAIN CNC PILOT 640 335
4.8 Milling cycles
Type of machining for technology database access: Milling
MT M after T: M function that is executed after the tool call T.
MFS M at beginning: M function that is executed at the
beginning of the machining step.
MFE M at end: M function that is executed at the end of the
machining step.
Cycle parameters (third input window)
WP Displays which workpiece spindle is used to process the
cycle (machine-dependent)
 Main drive
 Opposing spindle for rear-face machining
Notes on parameters/functions:
 Machining of contour or pocket: defined with overlap
factor U.
 Milling direction: depends on definition of cutting
direction H and the direction of tool rotation (siehe
„Milling direction for contour milling” auf Seite 342).
 Milling cutter radius compensation: effective (except
for contour milling with JK=0).
 Approach and departure: For closed contours, the
starting point of the first element (in rectangles, the
longer element) is the point of approach and departure.
The tool approaches directly or on an arc according to
approach radius R.
 Contour milling JK defines whether the milling cutter
is to machine on the contour (center of milling cutter on
the contour) or on the inside/outside of the contour.
 Pocket milling – roughing (O=0): Use JT to define
whether a pocket is machined from the inside toward
the outside, or vice versa.
 Pocket milling—finishing (O=1): First, the edge of the
pocket is machined; then the pocket floor is machined.
With JT you define whether a pocket floor is to be
finished from the inside towards the outside, or vice
versa.