4.20 Parting Cycle; Cut-Off Cycle G859 - HEIDENHAIN CNC PILOT 640 User Manual

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4.20 Parting cycle

Cut-off cycle G859

Cycle G859 parts the workpiece. If programmed, a Chamf./round.
is machined on the outside diameter. At the end of cycle, the tool
retracts and returns to the starting point.
You can define a feed rate reduction, which becomes effective as
soon as the position I is reached.
Parameters:
X: Cut-off diam.
Z: Cut-off posit.
XE: Inner diameter (pipe)
B: -B cham./+B round.
B > 0: Radius of rounding
B < 0: Width of chamfer
D: Speed limitation – maximum speed during parting
I: Diam. feed reduction – limit diameter over which traverse is
at reduced feed rate
I is defined: The control switches to feed rate after this
position
I is not defined: No feed rate reduction
E: Reduced feed
SD: Speed limit from I up
U: Collector active diameter (machine-dependent)
K: Retraction distance after parting – lift off the tool laterally
from the plane surface before retraction
Example: G859
%859.nc
N1 T3 G95 F0.23 G96 S248 M3
N2 G0 X60 Z-28
N3 G859 X50 Z-30 I10 XE8 E0.11 B1
END
360
DIN/ISO programming | Parting cycle
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017