Tapping With Compensating Chuck; Function; Programming - Siemens SINUMERIK 840D Function Manual

18.2.9

Tapping with compensating chuck

18.2.9.1

Function

When tapping with compensating chuck (G63) the spindle is not interpolated with the linear
axis, but is operated in the closed-loop speed controlled mode. The feedrate of the linear axis
dependent on the spindle speed and the thread pitch must be calculated and explicitly
programmed. As the spindle and linear axis are not interpolated together, to compensate
spindle speed fluctuations for example, a tapping drill in a length-compensating chuck is
required.
Retraction movement
The retraction motion is also programmed with G63 - but with the opposite spindle direction of
rotation.
Axis and spindle override value
While the "Tapping with compensating chuck" function is selected, 100% is active as axis and
spindle override value.
Feedrate
Feedrate F of the linear axis to be programmed is obtained from the product of the spindle
speed and the thread pitch of the tapping drill:
F [mm/min] = spindle speed S [rpm] *thread pitch [mm/U]
18.2.9.2

Programming

For tapping with compensating chuck, using the G63 command, the following traversing motion
is executed:
● G63: Tapping in the tapping direction up to the end of thread point
● G63: Retraction motion with programmed spindle direction of rotation reversal
Note
After a G63block, the last effective interpolation type G0, G1, G2 is active.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
S1: Spindles
18.2 Operating modes
769