HEIDENHAIN SW 68894x-02 - Manual (Page 269)

HEIDENHAIN CNC PILOT 640 269
4.6
Thr
ead
and
under
cut
cy
cles
Recut (longitudinal) thread
Call the thread-cutting menu
Select thread cycle
Press the Recut soft key
 On: Internal thread
 Off: External thread
This optional cycle reworks a single-start thread. Since you have
already unclamped the workpiece, the CNC PILOT needs to know the
exact position of the thread. Place the cutting tip of the tap drill in the
center of a groove and transfer the positions to the parameters
measured angles
and measured position by pressing the Take over
position
soft key. From these values the cycle then calculates the
angle of the spindle at the starting point.
This function is available only in manual operation.
Cycle parameters
X1
Starting point of thread
Z2 End point of thread
F1 Thread pitch (= feed rate)
U Thread depth – No input:
 External thread: U=0.6134*F1
 Internal thread: U=–0.5413*F1
I Maximum infeed
 I
Reduction of cutting depth
 I=U: One cut
 No input: Calculation from U and F1
C Measured angle
ZC Measured position
A Approach (infeed) angle (range: –60° < A < 60°;
default 30°)
 A<0: Infeed on left thread flank
 A>0: Infeed on right thread flank
R Remaining cutting depth only with GV=4 (default 1/100
mm)