Siemens SINUMERIK 840DE Programming Manual page 266

Feedrate Control and Spindle Motion
7.4 Positioning spindles (position-controlled axis operation) (SPOS, M19 and SPOSA)
Example of drilling cross holes in turned part
Cross holes are to be drilled in this turned part. The running drive spindle (master spindle) is
stopped at zero degrees and then successively turned through 90°, stopped and so on.
....
N110 S2=1000 M2=3
N120 SPOSA=DC(0)
N125 G0 X34 Z-35
N130 WAITS
N135 G1 G94 X10 F250
N140G0 X34
N145 SPOS=IC(90)
N150 G1 X10
N155 G0 X34
N160 SPOS=AC(180)
N165 G1 X10
N170 G0 X34
N175 SPOS=IC(90)
N180 G1 X10
N185 G0 X50
...
7-16
;Switch on cross drilling attachment
;Position main spindle directly at 0°,
;the program will advance to the next block immediately
;Switch on the drill while the spindle is being positioned
;Wait until the main spindle reaches its position
;Feedrate in mm/min (G96 is suitable only for the multi-
edge turning
;tool and synchronous spindle, but not for
;power tools on the cross slide)
;The spindle is positioned through 90° with read halt in a
;positive direction
;The spindle is positioned at 180° with respect to the
;spindle zero point
;The spindle turns in
;a positive direction through 90° from the absolute 180°
position, ending up in the
;absolute 270° position.
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals