HEIDENHAIN CNC Pilot 4290 V7.1 Description of B and Y axes - Manual (Page 52)

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DIN PLUS (Y Axis): Milling Cy
cles
1.11 DIN PLUS (Y Axis): Milling
Cycles
Area milling—roughing G841
G841 roughs surfaces defined with G376 Geo (XY plane) or with G386
Geo (YZ plane). The cycle mills from the outside toward the inside. The
tool moves to the working plane outside of the workpiece material.
Parameters
NS
Block number—reference to the contour description
P (Maximum) milling depth (infeed in the working plane)
I Oversize in X direction
K Oversize in Z direction
U (Minimum) overlap factor. Defines the overlap of milling paths
(default: 0.5).
Overlap = U*milling diameter
V Overrun factor. Defines the distance by which the tool should
pass the outside radius of the workpiece (default: 0.5).
Overrun = V*milling diameter
F Feed rate for infeed (default: active feed rate)
J Retraction plane (default: back to starting position)
„ XY plane: Retraction position in Z direction
„ YZ plane: Retraction position in X direction (diameter)
Oversizes are taken into account:
„ G57: Oversize in X, Z direction
„ G58: Equidistant oversize in the milling plane
Cycle run
1 Starting position (X, Y, Z, C) is the position before the cycle
begins.
2 Calculate the proportioning of cuts (infeeds to the milling planes,
infeeds in the milling depths).
3 Move to the safety clearance and plunge to the first milling depth.
4 Mill the first plane.
5 Retract by the safety clearance, return and cut to the next milling
depth.
6 Repeat steps 4 and 5 until the complete area is milled.
7 Return to “retraction plane J.”