Siemens SINUMERIK 840Di sl - Page 375

Tool offsets
8.11 Smooth approach and retraction
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
375
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Approach and retraction velocities
• Velocity of the previous block (G0):
All motions from
0
up to P
2
are executed at this velocity, i.e., the motion parallel to the
machining plane and the part of the infeed motion up to the safety clearance.
• Programming with FAD:
Specify the feedrate for
– G341: infeed movement perpendicular to the machining plane from P
2
to P
3
– G340: from point P
2
or P
3
to P
4
If FAD is not programmed, this part of the contour is also traversed at the modally
active speed of the previous block, if no F word is programmed in the SAR block.
• Programmed feedrate F:
This feedrate value is effective as of
3
or P
2
if FAD is not programmed. If no F word is
programmed in the SAR block, the speed of the previous block is active.
Example:
$TC_DP1[1.1]= 120
;Milling tool T1/D1
$TC_DP6[1.1]=7
;Tool with 7 mm radius
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
...