Operation Manual

278 Cycle programming
4.6 Thread and undercut cycles
Type of machining for technology database access: Finishing
All parameters that you enter will be accounted for—even if the
standard table prescribes other values. If the parameters I, K, W and
R are not defined, the MANUALplus determines these parameters
from "FP" in the standard table (see "DIN 76—undercut parameters" on
page 579).
Cycle run
1 Approach workpiece from starting point
 to the cylinder starting point X1, or
 for the thread chamfer
2 Machine thread chamfer, if defined
3 Finish cylinder up to beginning of undercut
4 Pre-machine undercut, if defined
5 Machine undercut
6 Finish to end point X2 on plane surface
7 Return
 Without return: Tool remains at the end point on plane
surface
 With return: Retract and return diagonally to starting point
8 Move to the tool change point according to the G14 setting
B Cylinder start chamfer (default: no start chamfer)
WB First-cut angle (default: 45°)
RB First-cut radius (default: no input = no element): Positive
value: First-cut radius, negative value = chamfer
G47 Safety clearance (see page 128)—evaluated only if "Omit
paths of rapid traverse" is active
MT M after T: M function that is executed after the tool call T
MFS M at beginning: M function that is executed at the
beginning of the machining step
MFE M at end: M function that is executed at the end of the
machining step
WP Displays which workpiece spindle is used to process the
cycle (machine-dependent)
 Main drive
 Opposing spindle for rear-face machining