Parting Unit - HEIDENHAIN CNC PILOT 640 User Manual

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Parting unit

The unit parts the workpiece. If programmed, a chamfer or
rounding arc is machined on the outside diameter. At the end of
cycle, the tool returns to the starting point. You can define a feed
rate reduction, which becomes effective as soon as the position I is
reached.
Unit name: G859_CUT_OFF / cycle: G859
Further information:
Cycle form:
X1, Z1: Start point contour
B: -B cham./+B round.
B > 0: Radius of rounding
B < 0: Width of chamfer
D: Maximum speed
XE: Inner diameter (pipe)
I: Diam. feed reduction – limit diameter over which traverse is
at reduced feed rate
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
Further forms:
Further information:
The limit to the Maximum speed D is only effective in
the cycle. After the cycle ends, the speed limit before
the cycle becomes effective.
Access to the technology database:
Machining operation: Contour recessing
Affected parameters: F, S, E
102
"Cut-off cycle G859", Page 360
"smart.Turn unit", Page 78
smart.Turn units | Units – Recessing
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017