Tapping Without Compensating Chuck; Function; Programming - Siemens SINUMERIK 840D Function Manual

18.2.8

Tapping without compensating chuck

18.2.8.1

Function

For tapping without compensating chuck, the traversing motion of the linear axis and the
spindle are interpolated, closed-loop position controlled. This requires a position-
controlled spindle with position measuring system.
①
②
Thread direction of rotation
The thread direction of rotation (right or left-handed thread) is defined by the sign of the pitch:
● Positive pitch → right-handed thread (direction of rotation corresponding to M3)
● Negative pitch → left-handed thread (direction of rotation corresponding to M4)
Defined spindle start position
When tapping without compensating chuck, a defined spindle start position (SPOS) must be
programmed in the following cases:
● Threads produced using multiple machining operations
● Threads, for which a defined thread start position is specified
SPOS = <start position>
G331 ...
18.2.8.2

Programming

For tapping without compensating chuck, using the G331 and G332commands, the following
traversing motion is executed:
● G331: Tapping in the tapping direction up to the end of thread point
● G332: Retraction motion up to the tapping block G331 with automatic spindle direction of
rotation reversal
Syntax
G331 <axis> <thread pitch>
G331 <axis> <thread pitch> S...
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
Thread pitch
Thread depth
S1: Spindles
18.2 Operating modes
763