HEIDENHAIN MANUALPLUS 620 User Manual page 323

Milling depth: The cycle calculates the milling depth
from the Milling top edge and the Milling floor—
taking the oversizes into account.
Milling cutter radius compensation: Effective (except
for contour milling with Q=0).
Approach and departure: For closed contours, the
point of the surface normal from the tool position to the
first contour element is the point of approach and
departure. If no surface normal intersects the tool
position, the starting point of the first element is the
point of approach and departure. For contour milling and
finishing (pocket milling), define with the Approach
radius whether the tool is to approach directly or in an
arc.
G57/G58 oversizes are taken into account if the
Oversizes I, K are not programmed:
G57: Oversize in X, Z direction
G58: The oversize "shifts" the milling contour as
follows:
– With inside milling and closed contour: The contour
is contracted
– With outside milling and closed contour: The
contour is expanded
– With open contour and Q=1: Left in machining
direction
– With open contour and Q=2: Right in machining
direction
HEIDENHAIN MANUALplus 620 323