330 ISO Programming
4.26 Milling Cycles
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 327
G840—Calculating hole positions: Page 328
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)
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