Siemens SINUMERIK 840D sl Function Manual page 936

Synchronous Spindles (S3)
Special features of synchronous mode
Application
Manufacturing operations with positioned leading spindle and rotating tools require exact
synchronism with the counter spindle which then functions like a following spindle. A turret
rotating about the following spindle allows parts to be machined with different tool types. The
following diagram shows an application in which the tool is positioned parallel to the main
spindle.
Figure 14-5
Requirements
Basic requirements for differential speed programming:
● Synchronous spindle functionality is required.
● The dynamic response of the following spindle must be at least as high as that of the
● The differential speed must be programmed in the channel in which the following spindle
● The differential speed must be enabled for the following spindle by the PLC via IS
936
Application on a single-slide turning machine with turret about Z axis
leading spindle. Otherwise, the system may suffer from reduced quality, for example, rigid
tapping without a compensating chuck G331/G332.
is also configured. The leading spindle can be programmed in a different channel.
"Enable overlaid movement" (DB31, ... DBX26.4). If the enable signal has not been set,
alarm 16771 "Channel% Following axis% Overlaid movement not enabled" is output. This
alarm is cleared when IS "Enable overlaid movement" (DB31, ... DBX26.4) is set or the
coupling is terminated.
Note
The differential speed does not therefore affect the coupling process.
The following or leading spindle cannot change gear stages while a coupling is active.
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions