Special Axes; Main Spindle, Master Spindle; Machine Axes - Siemens SINUMERIK 840Di sl Programming Manual

1.4.2

Special axes

In contrast to the geometry axes, no geometrical relationship is defined between the special
axes.
Axis identifier
In a turning machine with revolver magazine, for example,
Turret position U, tailstock V
Application examples
Typical special axes are tool revolver axes, swivel table axes, swivel head axes, and loader
axes.
N10 G1 X100 Y20 Z30 A40 F300
N20 POS[U]=10POS[X]=20 FA[U]=200 FA[X]=350
N30 G1 X500 Y80 POS[U]=150FA[U]=300 F550
N40 G74 X1=0 Z1=0
1.4.3

Main spindle, master spindle

The machine kinematics determine, which spindle is the main spindle. This spindle is
declared the master spindle in the machine data. As a rule, the main spindle is declared the
master spindle. This assignment can be changed with the program command SETMS
(spindle number). By issuing SETMS without statement of the spindle number you can
switch back to the master spindle defined in the machine data. Special functions such as
thread cutting apply to the master spindle, see "Spindle speed S, spindle direction of rotation
M3, M4, M5".
Spindle identifier
Identifiers: S or S0
1.4.4

Machine axes

Machine axes are the axes physically existing on a machine. The movements of axes can
still be assigned by transformations (TRANSMIT, TRACYL, or TRAORI) to the machine
axes. If transformations are intended for the machine, different axis names must be
determined.
The machine axis names are programmed only in special cases, such as reference point or
fixed point approaching.
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Fundamental Geometrical Principles
;Path axis movements
;Positioning axis movements
;Path and positioning axis
;Approaching a reference point
1.4 Axes
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