Cutting Rate (Svc) - Siemens Sinumerik 840D sl Programming Manual

Spindle motion

7.2 Cutting rate (SVC)

Example:
Program code
N10 S300 M3 S2=780 M2=4
Programmable switchover of master spindle
The SETMS(<n>) command can be used in the NC program to define any spindle as the
master spindle. SETMS must be in a separate block.
Example:
Program code
N10 SETMS (2)
Note
The speed specified with S..., along with the functions programmed with M3, M4, M5, now
apply to the newly declared master spindle.
If SETMS is programmed without a spindle name, the master spindle programmed in the
machine data is used instead.
7.2 Cutting rate (SVC)
As an alternative to the spindle speed, the tool cutting rate, which is more commonly used in
practice, can be programmed for milling operations.
The control uses the radius of the active tool to calculate the effective spindle speed from the program‐
med tool cutting rate:
S = (SVC * 1000) / (R
82
Comment
; Master spindle: 300 rpm, CW rotation
2nd spindle: 780 rpm, CCW rotation
Comment
; Spindle 2 is now the master spindle.
* 2π)
T
Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Fundamentals