Operation Manual

HEIDENHAIN CNC PILOT 640 309
4.7 Drilling cycles
Tapping, axial
Select drilling
Select tapping, axial
This cycle is used to tap a thread on the face of a workpiece.
Meaning of the retraction length: Use this parameter for floating tap
holders. The cycle calculates a new nominal pitch on the basis of the
thread depth, the programmed pitch, and the retraction length. The
nominal pitch is somewhat smaller than the pitch of the tap. During
tapping, the drill is pulled away from the chuck by the retraction length.
With this method you can achieve higher service life from the taps.
Cycle parameters
X, Z Starting point
C Spindle angle (C-axis position)—(default: current spindle
angle)
Z1 Start point drill (starting point of hole; default: drilling starts
from Z)
Z2 End point drill (end point of hole)
F1 Thread pitch (= feed rate) (default: feed rate from tool
definition)
B Run-in length to reach the programmed spindle speed and
feed rate (default: 2 * thread pitch F1)
SR Return speed for enabling rapid retraction (default: same
spindle speed as for tapping)
L
Retraction length when using floating tap holders (default: 0)
SCK Safety clearance (siehe Seite 140)
G60 Deactivate the protective zone for the drilling operation
 0: Active
 1: Inactive
G14 Tool change point (siehe Seite 140)
T Turret pocket number
ID Tool ID number
S Spindle speed/cutting speed
SP Chip breaking depth
SI Retraction distance
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.