HEIDENHAIN MANUALplus 4110 Pilot - Manual (Page 29)

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Undercut cycles
Thread undercut DIN 76
Undercut DIN 509 E
Undercut DIN 509 F
These cycles execute an undercut, and can also machine a cylinder
start chamfer, the adjoining cyclinder and the adjoining end face.
Undercut parameters that are not defined are automatically calculated
from the standard table.
Thread undercut: If you enter an “undercut oversize P”, the undercut
cycle will be divided into pre-turning and finish-turning. “P“ is the
longitudinal oversize. The transverse oversize is preset to 0.1 mm.
Information on the cycle parameters:
FP:
Thread pitch (with thread undercut) – default: FP is determined
from the diameter
E: Feed reduction (for plunge-cutting) – default: feed rate F
R: Undercut radius – default: value from standard table.
The undercut radius is executed on both sides of the undercut.
B: Cylinder 1st cut length– default: no chamfer machined at start
of cylinder
WB: 1st cut angle – default: 45 °
RB: 1st cut radius– default: no chamfer radius is machined
All parameters that you enter will be accounted for – even if the
standard table prescribes other values.
Example: Thread undercut DIN 76