HEIDENHAIN SW 688945-03 - Manual (Page 279)

HEIDENHAIN CNC PILOT 620/640 279
4.6 Thr
ead and under
c
ut cy
cles
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, R, P
and A are not defined, the CNC PILOT determines these parameters
from the cylinder diameter in the standard table (see "DIN 509 F –
undercut parameters" on page 575).
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 Machine undercut
5 Finish to end point X2 on plane surface
6 Return
 Without return: Tool remains at the end point on plane
surface
 With return: Retract and return diagonally to starting point
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