Operation Manual

HEIDENHAIN CNC PILOT 640 327
4.8 Milling cycles
Cycle run
1 Activate the C axis and position to spindle angle C at rapid
traverse (only in Teach-in mode)
2 Calculate the proportioning of cuts (infeeds to the milling planes,
infeeds in the milling planes)
Contour milling:
3 Depending on the approach radius R, approach the workpiece
and plunge to the first milling plane
4 Mill the first plane
5 Plunge to the next milling plane
6 Repeat 5 to 6 until the milling depth is reached
Pocket milling—roughing:
3 Move to the safety clearance and plunge to the first milling plane
4 Depending on pocket milling JT, machine the milling plane
either from the inside towards the outside, or vice versa
5 Plunge to the next milling plane
6 Repeat 4 to 5 until the milling depth is reached
Pocket milling—finishing:
3 Depending on the approach radius R, approach the workpiece
and plunge to the first milling plane
4 Finish-machine the edge of the pocket—one working plane after
the other
5 Depending on pocket milling JT, finish the pocket floor either
from the inside towards the outside, or vice versa
6 Finish-machine the pocket at the programmed feed rate
All versions:
7 Position to starting point Z and deactivate C axis
8 Move to the tool change point according to the G14 setting
Notes on parameters/functions:
 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.
Open contours are machined in direction of contour
definition. JK defines whether to move to the left or right
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.