HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 303)

HEIDENHAIN MANUALplus 620, CNC PILOT 640 303
4.20 P
a
rt
ing cy
cle
4.20 Parting cycle
Cut-off cycle G859
Cycle G859 parts the workpiece. If programmed, a chamfer or
rounding arc 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.
Example: G859
%859.nc
[G859]
N1 T3 G95 F0.23 G96 S248 M3
N2 G0 X60 Z-28
N3 G859 X50 Z-30 I10 XE8 E0.11 B1
END
Parameters
X
Cut-off (parting) diameter
Z Cut-off (parting) position
I Diameter for feed rate reduction
 I is defined: The control switches to feed rate E after this
position
 I is not defined: No feed rate reduction
XE Inside diameter (pipe)
E Reduced feed rate
B Chamfer/rounding
 B>0: Radius of rounding
 B<0: Chamfer width
D Speed limitation: maximum speed during parting
K Retraction distance after parting: Lift off the tool laterally from
the workpiece surface before retraction
SD Speed limitation from diameter I up
U Starting with this diameter the part catcher is activated
(machine-dependent function)