Siemens SINUMERIK 840D sl Programming Manual page 176

Geometry settings
8.3 Dimensions
Note
The positive direction of rotation (clockwise or counterclockwise) is set in the machine data.
Note
The traversing range between 0° and 360° must be set in the machine data (modulo
behavior) for positioning with direction specification (ACP, ACN). G91 or IC must be
programmed to traverse modulo rotary axes more than 360° in a block.
Note
The commands DC, ACP and ACN can also be used for spindle positioning (SPOS, SPOSA)
from standstill.
Example: SPOS=DC(45)
Example
Milling on a rotary table
Program code
N10 SPOS=0
N20 G90 G0 X-20 Y0 Z2 T1
N30 G1 Z-5 F500
N40 C=ACP(270)
N50 G0 Z2 M30
References
Function Manual, Extended Functions; Rotary Axes (R2)
176
The tool is stationary, the table turns to 270°
in a clockwise direction to produce a circular
groove.
Comment
; Spindle in position control
; Absolute dimensions, feed tool T1 in rapid
traverse.
; Lower tool during feed
; Table turns clockwise to 270 degrees (positive),
the tool mills a circular groove.
; Retraction, end of program
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals