HEIDENHAIN SW 548328-05 DIN Programming - Manual (Page 351)

HEIDENHAIN MANUALplus 620, CNC PILOT 620/640
351
4.26 Milling cy
cles
G840—Milling
You can change the machining direction and the cutter radius
compensation (TRC) with the cycle type Q, the cutting direction H
and the rotational direction of the tool (see following table). Program
only the parameters given in the following table.
See also:
 G840—Fundamentals: Page 348
 G840—Calculating hole positions: Page 349
Parameters—Milling
Q Cycle type (= milling location).
 Open contour. If there is any overlapping, Q defines whether
the first section (as of starting point) or the entire contour is
to be machined.
 Q=0: Center of milling cutter on the contour (without TRC)
 Q=1: Machining at the left of the contour. If there is any
overlapping, G840 machines only the first section of the
contour (starting point: 1st point of intersection).
 Q=2: Machining at the right of the contour. If there is any
overlapping, G840 machines only the first section of the
contour (starting point: 1st point of intersection).
 Q=3: The contour is machined to the left or right
depending on H and the direction of cutter rotation (see
table). If there is any overlapping, G840 machines only the
first section of the contour (starting point: 1st point of
intersection).
 Q=4: Machining at the left of the contour. If there is
overlapping, G840 machines the entire contour.
 Q=5: Machining at the right of the contour. If there is
overlapping, G840 machines the entire contour.
 Closed contours
 Q=0: Center of milling cutter on the contour (hole position
= starting point)
 Q=1: Inside milling
 Q=2: Outside milling
 Q=3 to 5: Not allowed
ID Milling contour—name of the contour to be milled
NS Block number—beginning of contour section
 Figures: Block number of the figure
 Free open or closed contour: First contour element (not
starting point)