HEIDENHAIN CNC Pilot 4290 Pilot - Manual (Page 87)

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Milling
Contour milling G840
G840 mills, finishes, engraves or deburrs figures or ”free contours”
(open or closed).
Parameters
Q:
Cycle type (= milling location)
nÿ Q=0: milling center on the contour (without radius
compensation)
nÿ Q=1 – closed contour: inside milling
nÿ Q=1 – open contour: left in machining direction
nÿ Q=2 – closed contour: outside milling
nÿ Q=2 – open contour: right in machining direction
nÿ Q=3 (only with open contours): It depends on the ”cutting
direction H” and the direction of tool rotation whether the tool
cuts from the left or right of the contour.
NS: Block number – Beginning of contour section
nÿ Figures: Block number of the Figure
nÿ ”free contour” (open or closed): first contour element (not
starting point).
NE: Block number – End of contour section
nÿ Figures: no entry
nÿ Closed contours: entry unnecessary
nÿ Open contours: last contour element to be milled
nÿ Contour consists of one element: entry unnecessary
H: Cutting direction – default: 0
nÿ H=0: up-cut milling
nÿ H=1: climb milling
I: (Maximum) infeed – no entry: milling in one infeed
F: Feed rate for infeed – default: active feed rate
E: Reduced feed rate for circular elements – no entry: current feed
rate