HEIDENHAIN CNC Pilot 4290 Pilot - Manual (Page 89)

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Milling
Pocket milling – roughing G845
Pocket milling – finishing G846
G845 roughs, G846 finishes closed contours and figures.
Parameters
NS:
Block number (reference to contour section)
P: (Maximum) milling depth (infeed in the working plane)
R: Radius of approaching/departing arc – default: 0 (only with G846)
nÿ R=0: contour element is approached directly; feed to approach
point above the milling plane – then perpendicular feed to
plunging depth
nÿ R>0: mill moves along approaching/departing arc, which
connects tangentially with the contour element
I, K: Allowance in X, Z direction (only with G845)
U: (minimum) overlap factor – overlap of tool paths (overlap = U*
cutter diameter) – default: 0.5
V: Overrun factor – has no significance for machining with the C
axis
H: Cutting direction – default: 0
nÿ H=0: up-cut milling
nÿ H=1: climb milling
F: Feed rate for infeed – default: active feed rate
E: Reduced feed rate for circular elements – no entry: current feed
rate
J: Return plane – no input: Tool returns to the starting position
nÿ Front or rear face: Return position in Z direction
nÿ lateral surface: Return position in X direction (diameter)
Q: Machining direction – default: 0
nÿ Q=0: from the inside toward the outside
nÿ Q=1: from the outside toward the inside