Differential Speed Between Leading And Following Spindles - Siemens SINUMERIK 840D sl Function Manual

Synchronous Spindles (S3)
14.4 Special features of synchronous mode
NC Start (DB21, ... DBX7.1)
See section "Configuration of the behavior with NC start".
Note
NC Start after NC Stop does not deselect synchronous operation.
14.4.4

Differential speed between leading and following spindles

When does a differential speed occur?
A differential speed develops, e.g. with turning machine applications, when two spindles are
opposite each other. Through the signed addition of two speed sources, a speed component
is derived from the leading spindle via the coupling factor. In addition to this, it is possible to
program the following for the following spindle:
● speed with S... and
● direction of rotation with M3, M4 or M5
The spindles can normally be synchronized by a coupling factor with the value '-1'. This sign
reversal then results in a differential speed for the following spindle as compared to an
additional programmed speed. This typical behavior in relation to the NC is illustrated in the
following diagram.
Figure 14-4
896
Schematic representation of process resulting in differential speed
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions