328 ISO Programming
4.26 Milling Cycles
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 327
G840— Milling: Page 330
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
overlapping, only the first section of the contour is
machined.
Q=2: Machining at the right of the contour. If there is
overlapping, only the first section of the contour is
machined.
Q=3: Not allowed
Q=4: Machining at the left of the contour. If there is
overlapping, the entire contour is machined.
Q=5: Machining at the right of the contour. If there is
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
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