HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 347)

HEIDENHAIN MANUALplus 620, CNC PILOT 640 347
4.26 Milling cy
cles
G840—Calculating hole positions
"G840 A1 .." calculates the hole positions and stores them at the
reference specified in "NF." Program only the parameters given in the
following table.
See also:
 G840—Fundamentals: page 346
 G840—Milling: page 349
Parameters—Calculating hole positions
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 (hole position
= starting point)
 Q=1: Machining at the left of the contour. If there is any
overlapping, only the first area of the contour is machined.
 Q=2: Machining at the right of the contour. If there is any
overlapping, only the first area of the contour is machined.
 Q=3: Not allowed
 Q=4: Machining at the left of the contour. If there is any
overlapping, the entire contour is machined.
 Q=5: Machining at the right of the contour. If there is any
overlapping, the entire contour is machined.
 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 Contour start block number—beginning of contour section
 Figures: Block number of the figure
 Free closed contour: First contour element (not starting
point)
 Open contour: First contour element (not starting point)
NE Contour end block number—end of contour section
 Figures, free closed contour: No input
 Open contour: last contour element
 Contour consists of one element:
 No input: Machining in contour direction
 NS=NE programmed: Machining against the contour
direction