Siemens SINUMERIK 840D Function Manual page 850

S3: Synchronous spindle
19.1 Brief description
Note that one spindle is always the master and the number of couplings results from the number
of axes less the master.
Options in synchronous mode
The following functions are available for synchronous mode:
● FS and LS turn at the same speed
(n
● Rotation in the same or opposite direction between LS and FS
(can be defined positively or negatively using transformation ratio k
● Following and leading spindles rotate at different speeds
(n
Application: Polygonal turning
● Settable angular position between FS and LS (φ
The spindles run at synchronous speed with a defined angular offset between FS and LS
(position synchronous coupling).
Application: Shaped workpieces
● Activation of synchronous operation between LS and FS can take place when the spindles
are in motion or at standstill.
● The full functionality of the open-loop and position control modes is available for the leading
spindle.
● When synchronous mode is not active, the FS and LS can be operated in all other spindle
modes.
● The transformation ratio can also be altered when the spindles are in motion in active
synchronous mode.
● With synchronous spindle coupling switched on, the offset of the FS to the LS (overlaid
movement) can be altered.
Coupling options
Synchronous spindle couplings can be defined as
● Permanently configured via channel-specific machine data
(hereinafter referred to as "permanently configured coupling") as well as
● Freely defined using language commands (COUP...) in the part program
(hereafter referred to as "user defined coupling")
. The following variants are possible:
1. A fixed configuration for a coupling can be programmed via machine data. In addition, a
second coupling can be freely defined via the part program.
2. No coupling is configured via machine data. In this case, the couplings can be user-defined
and parameterized via the part program.
850
= n ; transformation ratio k
FS LS
= k · n ; transformation ratio k
FS Ü LS
= 1)
Ü
≠ 1)
Ü
= φ
FS LS
Function Manual, 06/2019, A5E47437747B AA
)
Ü
+ Δφ)
Axes and spindles