HEIDENHAIN MANUALplus 4110 Pilot - Manual (Page 84)

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Undercut Form U G856
G856 machines a “Form U“ undercut, finishes the adjoining end face and
machines a chamfer/rounding.
Tool position at end of cycle: cycle starting point
Meaning of the NC blocks after G856:
N.. G856 I.. K.. ... /Cycle call with parameters
N.. G0 X.. Z.. /Undercut corner
N.. G1 X.. /Final point of end face
N.. G80 /End of contour description
Parameters
I:
Undercut diameter (diameter value)
K: Undercut width – If the cutting width of the tool is not defined,
the control assumes that the tool's cutting width equals K.
B: Chamfer/rounding
• B>0: Rounding radius
• B<0: Chamfer width
• Cutter radius compensation: is carried out
• Oversizes: are not considered
Undercut cycles