Siemens SINUMERIK 840D sl Programming Manual page 280

Fundamentals
2.10 Tool radius compensation
Approach and retraction velocities
● Velocity of the previous block (G0)
All motions from P
machining plane and the part of the infeed motion up to the safety clearance.
● Programming with FAD
Specification of the feedrate for
– G341: Infeed movement perpendicular to the machining plane from P
– G340: From point P
● Programmed feedrate F
This feedrate value is effective as of P
programmed in the SAR block, the speed of the previous block is active.
Example:
Program code
$TC_DP1[1,1]=120
$TC_DP6[1,1]=7
N10 G90 G0 X0 Y0 Z20 D1 T1
N20 G41 G341 G247 DISCL=AC(5) DISR=13 FAD 500 X40 Y-10 Z=0 F200
N30 X50
N40 X60
...
During retraction, the roles of the modally active feedrate from the previous block and the
programmed feedrate value in the SAR block are reversed, i.e. the actual retraction contour is
traversed with the old feedrate and a new speed programmed with the F word applies from P
up to P
280
up to P
0
or P
2
If FAD is not programmed, this part of the contour is traversed at the speed which is
active modally from the preceding block, in the event that no F command defining the
speed is programmed in the SAR block.
.
0
are executed at this velocity, i.e. the motion parallel to the
2
to P .
3 4
or P if FAD is not programmed. If no F word is
3 2
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
to P
2 3
Comment
;Milling tool T1/D1
;Tool with 7 mm radius
NC programming
2