Siemens SINUMERIK 840D sl Programming Manual page 90

Fundamentals
2.6 Spindle motion
M3:
M<n>=3:
M4:
M<n>=4:
M5:
M<n>=5:
SETMS(<n>):
SETMS:
Note
Up to three S-values can be programmed per NC block, e.g.:
S... S2=... S3=...
Note
SETMS must be in a separate block.
Example
S1 is the master spindle, S2 is the second spindle. The part is to be machined from two sides.
To do this, it is necessary to divide the operations into steps. After the cut-off point, the
synchronizing device (S2) takes over machining of the workpiece after the cut off. To do this,
this spindle S2 is defined as the master spindle to which G95 then applies.
Program code
N10 S300 M3
...
N100 SETMS(2)
N110 S400 G95 F...
...
90
Direction of spindle rotation clockwise for master spindle
Spindle direction of rotation clockwise for spindle <n>
Direction of spindle rotation counter-clockwise for master spindle
Spindle direction of rotation counter-clockwise for spindle <n>
Spindle stop for master spindle
Spindle stop for spindle <n>
Set spindle <n> as master spindle
If SETMS is programmed without a spindle name, the configured master spindle
is used instead.
Comment
; Speed and direction of rotation for drive spindle = pre-
set master spindle.
; Machining of the right-hand workpiece side.
; S2 is now the master spindle.
; Speed for new master spindle.
; Machining of the left-hand workpiece side.
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming