HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 263)

HEIDENHAIN CNC PILOT 4290 263
4.27 Milling Cy
cles
Program D and V to machine parts of a figure.
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 list.
See also:
„ G840—Fundamentals: Page 261
„ G840—Calculating hole positions: Page 262
D Starting element number for partial figures
The direction of contour definition for figures is
counterclockwise. The first contour element for figures:
„ Circular slot: The larger arc
„ Full circle: The upper semicircle
„ Rectangles, polygons and linear slots: The position angle
points to the first contour element.
V Ending element number for partial figures
A Sequence for “Calculate hole positions”: A=1
NF Position mark – reference at which the cycle stores the hole
positions [1..127].
WB Rework diameter—diameter of the milling cutter
„ The cycle takes the diameter of the active tool into
account when calculating the hole positions. Therefore,
you need to insert the drill before calling “G840 A1 ..”.
„ Program oversizes for calculating the hole positions and
for milling.
G840 overwrites any hole positions that may still be stored
at the reference “NF.”
Parameters – Calculating hole positions