S3: Synchronous Spindle; Brief Description; Function - Siemens SINUMERIK 840D Function Manual

S3: Synchronous spindle

19.1

Brief description

19.1.1

Function

The "Synchronous spindle" function can be used to couple two spindles with synchronous
position or speed. One spindle is defined as leading spindle (LS), the second spindle is then the
following spindle (FS).
Possible applications
Rear side machining
One application option is, for example, the reverse side machining in a double-spindle lathe
with on-the-fly transfer of the workpiece from the position-synchronous LS to the FS (or vice
versa), without having to decelerate down to standstill.
Multi-edge machining (polygonal turning)
The "Synchronous spindle" function provides the basis for multi-edge machining (polygonal
turning) through specification of an integer gear ratio k
Number of FS
The number of FS's that can be operated synchronously to an LS is only restricted by the
performance capability of the NC used. In principle, any number of FS can be coupled
simultaneously to an LS in arbitrary channels of the NC.
2 pairs of synchronous spindles can be active simultaneously in each NC channel.
Definition
The assignment of FS to LS pair of synchronous spindles can be parameterized channel-
specifically via machine data or flexibly defined via part program commands.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
Speed synchronism:
Position synchronism:
n = k * n with k
FS Ü LS
φ = φ + Δφ with 0° ≤ Δφ < 360°
FS LS
= 1, 2, 3, ...
Ü
between LS and FS.
Ü
19
847