HEIDENHAIN CNC PILOT 640 User Manual page 349

DIN/ISO programming | Thread cycles
Determination of external/internal thread:
G31 with contour reference—closed contour: External or
internal thread is defined by the contour. BD has no meaning
G31 with contour reference—open contour: External or internal
thread is defined by BD. If BD is not programmed, the contour is
used to determine whether a thread is external or internal.
If the thread contour is programmed directly after the cycle, BD
determines whether the thread is an internal or external thread.
If BD is not programmed, the algebraic sign of U is evaluated (as
in the MANUALplus 4110).
U > 0: Internal thread
U < 0: External thread
Start angle C: At the end of the Slop.length B the spindle is at the
Start angle C position. Therefore, if the thread is to start exactly
at the Start angle, position the tool by the Slop.length or by the
Slop.length plus a multiple of the thread pitch—in front of the
beginning of the thread.
The individual thread cuts are calculated from the Thread depth,
Max. approach I and Type of infeed V.
NC stop – the control retracts the tool from the
thread groove and then stops all tool movements
Lift-off distance in the threadLiftOff machine
parameter (no. 601804)
Feed rate override is not effective
Danger of collision!
The control does not check for collisions between the Overflow
length P and the the workpiece contour (e.g. contour of the
finished part). Danger of collision during machining!
Test Overflow length P in the Simulation submode using the
graphic
Example: G31
. . .
FINISHED PART
N 2 G0 X16 Z0
N 3 G52 P2 H1
N 4 G95 F0.8
N 5 G1 Z-18
N 6 G25 H7 I1.15 K5.2 R0.8 W30 BF0 BP0
N 7 G37 Q12 F2 P0.8 A30W30
N 8 G1 X20 BR-1 BF0 BP0
N 9 G1 Z-23.8759 BR0
N 10 G52 G95
N 11 G3 Z-41.6241 I-14.5 BR0
N 12 G1 Z-45
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017
NOTICE
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