HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 274)

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4.27 Milling Cy
cles Plunge in a reciprocating circular motion O=6, 7: The tool
plunges at the plunging angle “W” and mills a circular arc of
90°. The cycle then mills along this path in the opposite
direction. As soon as it reaches the milling depth “P,” the
cycle switches to face milling. “WE” defines the arc center,
“WB” the arc radius.
„ O=6 – manually: The tool position corresponds to the
center of the circular arc. The tool moves to the arc starting
point and plunges.
„ O=7 – automatically (only permitted for circular slots and
circles): The cycle calculates the plunging position on the
basis of “Q:”
„ Q0 (from the inside toward the outside):
– Circular slot: The circular arc lies on the curvature radius
of the slot
– Circle: Not permitted
„ Q1 (from the outside toward the inside): Circular slot,
circle: The circular arc lies on the outermost milling path
W Plunging angle in infeed direction
WE Position angle of the milling path/circular arc. Reference axis:
„ Face or back: Positive XK axis
„ Lateral surface: Positive Z axis
Default position angle, depending on “O:”
„ O=4: WE= 0°
„ O=5 and
„ Linear slot, rectangle, polygon: WE= position angle of the
figure
„ Circular slot, circle: WE=0°
„ “Free” contour and Q0 (from the inside toward the
outside): WE=0°
„ “Free” contour and Q1 (from the outside toward the
inside): Position angle of the starting element
WB Plunge length/plunge diameter (default: 1.5 * milling
diameter)
For the machining direction Q=1 (from the outside toward
the inside), please note:
„ The contour must start with a linear element.
„ If the starting element is < WB, WB is reduced to the
length of the starting element.
„ The length of the starting element must not be less than
1.5 times the diameter of the milling cutter.
Parameters—Milling