Siemens SINUMERIK 840D sl Function Manual page 897

Synchronous Spindles (S3)
14.1 Brief description
14.1.1 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.
Two 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.
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Speed synchronism:
Position synchronism:
n = k * n , when k
FS Ü LS Ü
φ = φ + Δφ, when 0
FS LS
between LS and FS.
Ü
14
= „1, „2, „3, ...
x Δφ t=360
o o
897