HEIDENHAIN SW 68894x-02 - Manual (Page 273)

HEIDENHAIN CNC PILOT 640 273
4.6
Thr
ead
and
under
cut
cy
cles
Recut tapered thread
Call the thread-cutting menu
Select tapered thread
Press the Recut soft key
 On: Internal thread
 Off: External thread
This optional cycle recuts a single or multi-start external or internal
taper 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, Z1
Starting point of thread
X2, Z2 End point of thread
F1 Thread pitch (= feed rate)
D No. of gears (threads per unit)
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
W Taper angle (range: –60° < A < 60°)
GK Run-out length
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